Lear 1A Anti Ice and Environmental

7/26/2019 Lear 1A Anti Ice and Environmental

1/45

L e a r j e t

3 A

P i l o t s

Manual

T BLEOFCONTENTS

Wyfl om

v

NTI I CE

ENV RONMENT L

Ant i i ce

Syst ems 6 - 1

I c e

Det ect L i ght s . 6 - 1

Wng I nspect i on

L i ght

. 6 - 2

Engi ne and

Nacel l e

I n l e t Ant i i ce

. 6 - 2

N CHE T

Sw t ches

. 6 - 2

N CHTON

L i ght

6 3

L

and

RN C

HT

Li ght s

. 6 - 3

WngAnt i i ce

. 6 - 3

ST BWNG

HE TSw t ch

WngHeat

Funct i on

6 3

Wng

Ant i i ce Syst em Fi gur e 6 - 1 6 4

WNGTEMP

I ndi cat or

. 6 - 5

WNG

OV

HT

L i ght

. 6 - 5

Hor i zont al S t a bi l i z er Ant i i ce

6 5

ST B

WNG

HE T

Sw t ch

S t a bi l i z er

Heat

Funct i on

6 6

ST B

HE T

L i ght

6 6

W ndshi el d

Ant i i ce

6 6

W ndshi el d

Ant i i ce

Syst em Fi gur e 6 - 2 6 7

WSHLD

HE TSw t ch . 6 - 8

WSHLDHT

L i ght

6 8

WSHLDOV

HT

Li ght

. 6 - 8

W ndshi el d

Defog

6 9

WSHLD

DEFOG

Sw t ch

. 6 - 9

L

and

R

WSDEFOG

Annunci at or s

. 6 - 1 0

W ndshi el d

Defog

Syst em Fi gur e 6 - 3

. 6 - 1 0

W ndshi el d and

RadomAnt i i ce

Al cohol

Syst em

6 - 1 1

LCOHOLSw t ch

6 - 1 1

LCLOW

aut i on

Li ght . 6 - 1 1

Al cohol

Ant i i ce Syst em

Fi gur e 6 - 4 6 12

P i t o t - s t a t i c andSt a l l

Warni ng

Ant i i ce 6 13

PTTOTHE T

Sw t ches

. 6 - 1 3

PTTOTHT

Li ght . 6 - 1 3

OxygenSyst em

6 14

OxygenSt or age andPressure

Regul at or 6 14

OxygenSyst emSchemat i c Fi gur e 6 - 5

. 6 - 1 5

OxygenPressure Gage 6 16

OxygenSyst em

Cockpi t

Cont r ol s

. 6 - 1 6

PM 121

VI 1

Change

4


2/45

P i l o t s Manual

L ea r j e t

3 A

TABLE

OFCONTENTSCont

Passenger

Masks

6- 17

Passenger

Mask

Fi gur e

6 - 6 )

6- 17

Crew

Masks

6- 18

CrewMask

6600214 S e r i e s

Fi gur e 6 - 7 )

6- 18

CrewMask

Scott TOMC10- 15- 01 Fi gur e 6 - 8 ) 6- 19

Pressur i zat i on Syst em

6- 19

Normal

Pressur i zat i on 6- 20

Emergency

Pressur i zat i on 6- 20

Pressur i zat i on Syst em

Schemat i c

Fi gur e

6 - 9 )

. 6- 21

Pressur i zat i on

Cont r ol s

and

I ndi cat ors

6- 22

BLEEDAIRSwi t ches

6- 22

BLEED

AIRWarni ng

Li ght s

6- 22

C BAIRSwi t ch

6- 23

CAB

AIR

Li ght

6- 23

Pressur i zat i on

UTOM N

Sw t c h 6- 23

Cabi n

Cont r ol l er 6- 23

Pressur i zat i onManual

Cont r ol

Lever UP-DN

6- 24

CABI NALT/DFF PRESSGage

6- 24

CABI NCLI MB

I ndi cat or

6- 24

EMER

PRESS

OVERRIDE

Swi t ches 6- 24

CABALT

Li ght

6- 25

Cabi n

Al t i t ude

Warni ngHorn

6- 25

SYSTEM

TEST

Swi t ch

CABI NALTFunct i on 6- 25

Ai r Condi t i oni ng andHeat i ng 6- 25

Pr i mar y Heat i ng andCool i ng

Bl eed

Ai r

6- 26

Tai l cone Bl eed- Ai r Di st r i but i on Fi gur e 6- 10

6- 27

CAB

AIR

Swi t ch

6- 28

UTOM N

Sel ect or

6- 28

HOT-COLD

Temper at ure S e l e c t o r 6- 28

Ai r

Di st r i but i on

Schemat i c

w t h R12 Freon Cool i ng Syst em Fi gur e

6 - 1 1 )

6- 29

w t h R134ACool i ng Syst em Fi gure 6 - 1 2)

6- 30

TEMP

CONTI ndi cat or

6 - 3 1

CABI NTEMP i ndi cat or

6 - 3 1

Temper at ure Cont r ol Schemat i c Fi gure

6 - 1 3)

6- 32

R

FreonCool i ng Syst em

Ai r c r a f t

wi t hout

For war d

Evapor at or

and Bl ower

Uni t 6 - 3 3

R Freon

Cool i ng

Syst em

St andar d

Evapor at or

Fi gur e

6 - 1 4 )

6- 33


3/45

L ea r j e t 31A

P i l o t s Manual

TABLEOF

ONTENTS

Cont

COOL-OFF Swi t ch 6- 34

CABINF NSwi t ch . 6- 34

Cabi n Bl ower

Di ver t er

Cont r ol

. 6- 34

REWF N

Swi t ch

. 6- 34

R12

Freon

Cool i ng

Syst em

A i r c r a f t wi t h Forward

Evaporat or and

Bower

Uni t . 6 35

COOL-OFFSwi t ch 6- 35

CABIN

F NSwi t ch 6- 35

Cabi n

Bl ower Di ver t er Cont rol . 6- 36

R12

Fr eon Cool i ng

Syst em

Opt i onal

For ward

Evaporat or

Fi gure6- 15 . 6- 36

REWF N

Swi t ch

. 6- 37

R134ACool i ng Syst em

. 6- 37

COOL-OFFSwi t ch

6- 38

GASPERFAN

. 6- 38

FLOODFANCont rol

. 6- 39

REWF NCont r ol . 6- 39

R134ACool i ng

Syst em

Fi gure 6 - 1 6 ) 6- 39

Auxi l i ary

Heat i ng Syst em

. 6- 40

CrewHeater 6- 40

Cabi n Heater . 6 - 4 1

UX

HTSwi t ch

. 6- 42


4/45

Lear j et 31A

P i l o t s

Manual

ANTI ICE

SYSTEMS

SECDON

ANTI ICE

ENVIRONMENTAL

Ai rcraf t

a n t i - i c e protecti on i s provi ded through t he use of

e l e c t r i c a l l y

heat ed

a n t i - i c e

sys t ems,

engi ne

bl eed

a i r heat ed a n t i - i c e

syst ems, and

anal cohol a n t i - i c e system E l e c t r i c a l l y heat ed s ys t ems

i nc l ude

t he

pi -

t o t - s t a t i c

probes,

t o t a l

a i r

t emper at ur e

probe,

engi ne

i n l e t

a i r

t emper a-

ture

and

pressure sensors,

s t a l l war ni ng vanes, and

hori zont al s t a b i -

l i z e r l eadi ng

edge

E l e c t r i c a l l y heat ed w nds hi el ds pr ovi de

w nds hi el d def oggi ng Engi ne

bl eed

a i r i s u t i l i z e d t o heat t he

wng

l eadi ng

edge,

w ndshi el d,

andnacel l e i n l e t s Theal cohol systemi s i n -

s t a l l e d t o

pr ovi de a n t i - i c i n g

f or t he

nose radomeand

backup

a n t i - i c e

protect i on

f or t he p i l o t s

w nds hi el d i n

event

of

nor mal

ant i - i c i ng s y s -

temmal f unct i on

ICE

DETECT

LIGHTS

Two i c e

detect

l i g h t s are i n s t a l l e d

on

t he f or war d

gl areshi el d t o

i n d i -

cate

i c e

or

moi s t ur e

f ormat i on ont he

w nds hi el d dur i ng

ni ght

opera-

t i ons These

l i g h t s

ar e

i l l um nat ed whenever

t he

BATTERYsw t ches

are On

Wen

part i c l es of

i c e

or moi s t ur e f or m

l i g h t

ref ract i on resul ts

i n

t he appearance of two r ed a r e a s

appr oxi mat el y 14 2

i nches

38

mm

i n

di amet er,

on

t he

w nds hi el d

The

l i g h t

on

t he

p i l o t s

s i de

i s

l o -

cated

i n

a

pos i t i on covered

by

t he

w nds hi el d

a n t i - i c e ai rs t ream The

c o p i l o t s

l i g h t i s

posi t i oned

out si de t he

a n t i

i c e ai r st ream

t h e r e f o r e

t he c o p i l o t s w nds hi el d must be

moni t or ed

whenever

w nds hi el d

a n t i - i c e

system i s i n

oper at i on

Ther ed

areas

i ndi cate i ce

encounters

whent heOATi s bel ow

f reezi ng

and

moi st ur e

encounters

when

t he

OAT s

above f reezi ng The

l i g h t s

are suppl i ed 28VDC

hrough

t he t -

ampLandRCEDET

c i r c u i t

breakers ont he

p i l o t s

and

c o p i l o t s c i r -

c u i t

br eaker

panel s

respect i vel y

PM121

6-1

Or i gi nal


5/45

P i l o t s Manual

Leazj et 31A

WNGNSPECTI ONLI GHT

Thew ngi nspect i on l i g h t ,

l ocat ed on

t he r i ght

f or war d

f usel age, may

be

used

t o vi s ual l y i ns pect t he

r i g h t wng l eadi ng edge

f or i ce

accu-

mul at i on dur i ng

ni ght oper at i ons

Thel i g h t

i s

i l l um nat ed

bydepr ess -

i ng

t he

WNG

NS?

LI GHT

mmntary

button

on

t he

c o p i l o t s

di m

mr panel The l i g h t

i l l um nat es

a

bl ack

dot

on

t he

out boar d

w ng

l eadi ng

edge

t o

enhance vi sual

det ect i on

of i c e accumul at i on Power

i s

suppl i ed through t he

5-amp

WNGNSP

LT

c i r c u i t

br eaker ont he

c o p i l o t s c i r c u i t

br eaker panel

ENGNE

ND

NACELLE

I NLET

ANTI - I CE

Theengi ne and

nacel l e i n l e t a n t i - i c e

s ys te m

pr ovi des

a n t i - i c e

protec-

t i on f or t he nacel l e i n l e t s and t he

engi ne

i n l e t ai r

t emper at ur e

and

pressure

sensor mas t s

Theengi ne

i n l e t s ar e a n t i Toed bydi r ect i ng en-

gi ne

bl eed ai r

through di f f u s e r

t ubes

t o

t he

i nner surfaces

of t he na-

c e l l e i n l e t l i p The engi ne a i r

t emper at ur e

T Z ` 2 )

andpressure Pn

sensor

mas t s

ar e a n t i i c ed by e l e c t r i c a l heat i ng el ement s i n s t a l l e d

i n

t he

base of

t he mas t s

Each engi ne a n t i - i c e system

i s i ndependent l y

oper at ed and

consi st s of

a

PZ- 2/ T~- 2 mas t heat i ng el ement ,

a

nacel l e

a n t i - i c e control

val ve,

a

pressure

sw t ch,

a

control

s w t c h,

an

amber

NAC

HT

i g h t ,

and

associ at ed

a i r c r a f t

w r i n g

andbl eedai r

pl umbi ng

Cont r ol dr cui t s ar e

powered

by28 VDC

suppl i ed

through

t he 75-

ampL

and

R

NAC

HT

c i r c u i t

br eaker s

ont he

p i l o t s

and

c op i l o t s c i r -

c u i t br eaker panel s r espect i vel y

N HEAT

SWTCHES

The

l e f t

and

r i g h t

engi ne

and

nacel l e

i n l e t

a n t i - i c e

s yst ems

ar e

i nde-

pendent l y cont r ol l ed

through

t heNACHEATsw t ches i n t he ANTI-

I groupon

t he cent er s w t c h

panel

EachNAC

HEAT

s w t c h has

two posi t i ons On L or R)

and

OFF Wen

a

NACHEAT s w t c h

i s

pl aced i n

t he

On L or R) po s i t i o n ,

t he associ at ed P12/ T17

sensor

el e-

mnt

i s

ener gi zed,

t he associ at ed

sol enoi d- oper at ed

nacel l e a n t i - i c e

control val ve opens,

and

t he

gr eenNACHTONnnunci at or wi l l

i l l u -

m n ate Engi ne bl eed a i r f l ows

through

t he

open

val ve t o

di f f user

t ubes

whi chdi s t r i but e t he heat ed a i r

on

t he

i nner

surface

of

t he

na-

c e l l e

i n l e t

l i p

Si nce t he sol enoi d- oper at ed

control

val ve

i s

ener gi zed

dosed, nacel l e

i n l e t

a n t i - i c e pr ot ecti on i s oper at i onal i n t he event of

an e l e c t r i c a l

system

f a i l u r e

6

PM121

Or i gi nal


6/45

Lear j et 31A

Pf l ot e Manual

NAC

HT

ON

LI GHT

The

gr een

NACHT

ON

i g h t

on

t he

gl areshi el d

annunci at or panel

pr ovi des

t hecreww t h vi sual

i ndi cat i on

t h a t

oneor bot h

nacel l e heat

s yst ems are on TheNAC

HT

ON

l i g h t

wi l l

i l l umnate

anyt i me

a

NAC

HEATSw t c h i s

i n

t heOn

pos i t i on

LANDRNACHT LI GHTS

The

amber

L

and

R

NACHT l i g h t s on t he gl areshi el d annunci at or

panel pr ovi de t he creww t h

vi s ual i ndi cat i on of

a

nacel l e i n l e t ant i -

i c e system

mal f unct i on

The

l i g h t s

ar e oper at ed by

pressure

sw t ches

i n

t he ass oci at ed nacel l e

i n l e t

bl eed

ai r

pl umbi ng

I l l um nat i on of

a

NAC

HT

l i g h t

whent he

ass oci at ed

NAC

HEAT

s w t ch

i s

i n

t he

On

pos i t i o n

i ndi cat es

t h a t i n s u f f i c i e n t pressure i s bei ng

appl i ed

t o t he

en-

gi ne a n t i - i c e system

due

t o

a

mal f unct i on of

a

nacel l e a n t i - i c e control

val ve

I l l um nat i on

of

aNACHT l i g h t when

t he ass oci at ed NAC

HEAT sw t ch

i s

i n

t he OFF

pos i t i on

i ndi cat es that bl eed

ai r

pressure

i s

bei ng

appl i ed

t o

t he

engi ne

a n t i - i c e systemdue t o amal f unct i onof

a

nacel l e

a n t i - i c e

control

val ve

WNG

ANTI - I CE

The

wng

a n t i - i c e s yst ems

u t i l i z e

engi ne

bl eed

ai r

di rected

through

di f f user t ubes

i n each wngl eadi ng

edge

The

heat ed

ai r

i s di st r i but ed

t o t he wng

root

and l eadi ng edge andthen al l owed

t o ex i t i nt o t he

cent er w ng wheel

wel l ar ea

The

system

c o n s i s t s

of

wng

di f f user

tubes

an

over heat

warni ngl i g h t a

t her mosw t ch

aw ng t emper at ur e

sensor ana n t i - i c e shut of f

val ve

a

wng

t emper at ur e

i n di c at or

a s y s -

tem

sw tch andass oci at ed a i r c r a f t

w r i ng

E l e c t r i c a l

power

f or

system

oper at i on

i s

28

VDC

suppl i ed

through

t he

7

. 5- amp

WNGHTc i r c u i t

br eaker ont he

c o p i l o t s

c i r c u i t

breaker

panel

STAB

WNG

HEATSWTCH

WNG

HEATFUNCTI ON

The wng

a n t i - i c e system i s cont rol l ed

through

t he STAB

WNG

HEATs w t ch l ocat ed

i n

t he ANTI- ICEgroup

on t he cent er sw t ch

panel

The

s w t ch has two posi t i ons

On

STABWNG

HEAT and

OFF Wen

t he

STABWNGHEAT s w t ch i s s e t On,

t he

a n t i - i c e

shut-

of f

val ve

control

sol enoi d

wi l l

cl ose

al l ow ng pr essur e

t o

bui l d w t hi n

t he val ve r ef er ence

chamber s

Thebui l di ng pr essur e

wi l l opena

val ve

i n t he bl eedai r

ai rs t reamand

al l ow

heat ed ai r

t o

f l o w through

t he

duct i ng

i n t o

t he wng

d i f f u s e r

t ubes

I n

t he

event

of

an e l e c t r i c a l s y s -

tema i l u r e

t he val ve wi l l

shut of f

t hebl eed

ai r f l o wand w nga n t i - i c e

pr ot ecti on

wi l l

not

be

avai l abl e

PM121

6

Change


7/45

Pi l ovs

Manual

ear j et 3 A

WN NTI ICESYSTEM

Fi gure6

6

PM 2

r i gi nal


8/45

Lear j et 3 A

Pi l ot s

Manual

WNGTEMPINDCATOR

TheWNGTEMP i nd i c at o r l ocat ed i n t he

ANTI I CE

gr oup

on

t he

center

swi t ch

panel ,

i s

i n s t a l l e d

t o

pr ovi de a

vi sual i ndi cat i on of t he

wng

l eadi ng

edge

t emperatur e

The i ndi cat or r ecei ves

i nput

si gnal s

from

he

w ng

t emperatur e sensor i n s t a l l e d

ont he

i nner sur f aceof t he

l e f t

w ng

l eadi ng edge The i ndi cat or f a c e i s di vi ded i nto three c o l

or ed segment s

bl ue, green,

and

r ed

I f

t he i ndi cat or

poi nter

i s

i n t he

bl ue segment , wngl eadi ngedge t emperatur e i s bel owappr oxi matel y

40F

4C I f the i ndi cator poi nt er

i s

i n t he

bl ue segment and t he

STABWNGHEAT swi t ch i s On asyst emmal f unct i on i s i ndi cat ed

I f t he i ndi cat or poi nt er i s i n t he

gr een

segment ,

wng l eadi ng

edge

t emperatur e

i s

above

40F

4C

I f

t he i ndi cator

poi nter

i s

i n t he r ed

segment , t he

w ng

l eadi ng

edge

i s

appr oachi ng

an

overheat condi t i on

and

cor recti ve

act i on

must be t aken

The

w ng

a n t i i c e system

shoul d

be

energi zed

whenever

f l y ing t hrough v i s i b l e

moi st ur e

and t he

WNGTEMP

i ndi cat or poi nter

i s

i n

t he

bl ue

segment

WNG

HT

LI GHT

The r edWNGOVHT

l i g h t on

t he gl areshi el d

annunci at or

panel ,

wi l l

i l l umnate i n

t he event

t h a t

t he

wng

l eadi ng

edge

heats

t o

215F

102C The l i g h t i s ener gi zed by t he

overheat

want i ng l i g h t

t hermo-

swi t ch l ocat ed on

t he

i nner

sur f ace of

t he

r i g h t w ng l eadi ng

edge

HORIZONTAL

STABI LI ZER

ANTI - I CE

Thehor i zontal s t a b i l i z e r a n t i i c e syst emu t i l i z e s sequenced

e l e c t r i c a l

heat i ng el ement s al ong t he

hor i zontal

s t a b i l i z e r

l eadi ng

edge

The

systemconsi st s of

an


heat ed

bl anket bonded t o each

ha l f

of t he

hor i zontal

s t a b i l i z e r l eadi ng

edge,

a sequence

t i me r a caut i on

l i g h t a

system

swi t ch,

andassoci at ed a i r c r a f t

wi r i ng Control c i r c u i t s

oper ate on 28VDCsuppl i ed t hrough t he

7S amp

STAB

HTc i r c u i t

br eaker

on

t he

copi l ot s

c i r c u i t br eaker panel E l e c t r i c a l

power f or t he

heat i ng

el ement s

i s

28

VDC

suppl i ed

t hrough a 130- amp current

l i m

i t e r

PM 2

6

Or i gi nal


9/45

P i l o t s Manual

Lear j et 31A

STABWNGHEATSWTCH

STABI LI ZER

HEATFUNCTION

Thehor i zont al s t abi l i zer ant i - i ce system s cont r ol l ed through t he

STAB

WNG

HE Ts w t c h ont he

cent er

s w t c h panel Thes w t c hhas twopo-

s i t i ons

On

STABWNG

HEAT

and

OFF

When

t he

a i r c r a f t

i s

i n

f l i gh t

and t he

STAB

WNG

HE T

s w t c h i s On, 28VD s suppl i ed through

t he

s t ab heat

r e l a y box t o t he

sequence t i mer

The

t i mer di s t r i but es

i n-

t e rmt ten t e lect r ica l power

t o

t he

i ndi vi dual heat i ng el ement s i n a f or -

war d- t o- af t sequence of 15 seconds dur at i on each

Approximatel y

3

mnutes ar e

r equi r ed t o

compl ete a f u l l cyc l e The center,

or

par t i ng e l -

ement s ,

ar e

suppl i ed

wthcont i nuous el ect r i cal power

Duri ngnormal

s tab i l i ze r heat oper at i on, t he a i r c r a f t D

MPS

r eadout

w l l

r e f l ec t a

pul sat i ng

current

dr ai n

of

appr oxi mat el y

60-amps i n

15

second

cycl es

At

l east one engi ne

gener at or

must be oper at i ng t o ener gi ze t he s t ab

heat cont r ol ci r cui t s

The cont r ol

c i r c u i t s ar e r out ed through a st ar t

cut -

out r el ay

and

t he r i ght

squat

s w t c h

t her ef or e,

t he

system

s

i noper at i ve

when t he squat s w t c h i s i n t he groundmodeand dur i ng engi ne s ta r t

STABHEAT LIGHT

The

amber STAB

HT

i g h t

l ocat ed

on

t he

gl ar eshi el d annunci at or panel

w l l

i l l umnat ewhenever t he STAB

WNG

HE Ts w t c h i s

On

and t he

heat i ng bl anket par t i ng el ement s

ar e not r ecei vi ng e lect r ica l power

Duri ng f l i g h t i l l umnat i on of

t he STAB

HTl i ght

i ndi cat es

system a i l -

ur e Duri ng ground oper at i on, t he STAB

HT

l i ght shoul d

i l l umna t e

whenever t he STAB

WNG

HE Ts w t c h s

ON

WNDSHIELDANTI- ICE

Primary

w ndshi el d

an t i - i c i ng

i s

acc ompl i s hed

by

di r ec t i ng

condi -

t i oned engi ne bl eed

ai r

through

duct i ng and

cont r ol val ves

toexternal

out l et nozzl es f orward of

t he

w ndshi el d

The

wndshi el d an t i - i c e sys-

temconsi st s

of

an an t i - i c e

over heat

shut of f val ve,

a

w ndshi el d

an t i - i c e

modul ati ng val ve, one l ow l i m t 215F

[ 102C]

and one

h i gh - l im t

250F

[ 121C]

thermoswtch f or ground

oper at i ons,

one l ow l i m t

250F

[ 121C]

and one

h i gh - l im t

270F

[ 132C]

thermoswtch

f or

f l i g h t

oper at i ons,

a green

WSHLD

HT

l i g h t a r ed

WSHLD

OV

HT

warni ng

l i g h t

a

ram

ai r

modul ati ng

val ve,

an

an t i - i c e

duct

t emper at ur e

sensor, an

an t i - i c e

heat

exchanger ,

two

out l et

nozzl e ass embl i es, a sys-

temcont r ol sw t ch, and associ at ed a i r c r a f t w r i ng and bl eed ai r duct -

i ng

El ect r i cal

power

t o

t he cont r ol c i r c u i t s i s 28

VD suppl i ed

through

t he 7 5 amp

WSHLD

HT

c i r c u i t br eaker

on

t he pi l o t s c i r c u i t br eaker

panel

6- 6

PM121

Change

3


10/45

Lear j et

3 A

P i l o t s Manual

Change2

WNDSHELD

ANTI ICE

SYSTEM

Fi gure

6

NOTE Thi s f i gur e i s

i nt ended

t o r e f l e c t t he

system l o g i c

nd not

necessar i l y l l of t he act ual

component s used t o

accompl i sh

that

l o g i c

ONFUGHTTEMPERATURE

UMTTHERMOSIMTCH

RAMAI R

MODaannNG

VALVE

Overheat An t i - I c e

Shut of f l ve

i s

nor mal l y

c l osed

must

be

energi zed

open

ROUNDTEMPERATURE

l e c t r i c a l ground on t h i s

w r e tu rns

UMTTHERMOSWTCH

WSHLD

HTl i g h t

on

SQUATSWTCHRELAY

l e c t r i c a l ground

on

t h i s

wi r e tu rns

makes connect i onwhen

a i r c r a f t

s

on

the

gr ound

WSHLDOVHTl i g h t on

i nput i s power

or

open

c i r c u i t

the

out put

i s

an

e l e c t r i c a l ground


11/45

L ea r j e t

3 A

P i l o t s

Manual

WSHLD

HEATSWTCH

The

wi ndshi el d a n t i - i c e

system cont r ol l ed t hr ough

t he

WSHLD

HE Tsw t ch i n

t he

ANTI - I CE

gr oup

on

t he cent er sw t c h

panel

The

sw t ch

has

thr ee posi t i ons

On

WHLD

HEAT

HOLD and

OFF

Whent heBATTERYsw t ches

ar e

s e t ON

t he wi ndshi el d a n t i - i c e over-

heat shut of f

val ve

i s ener gi zed

t o

t he open posi t i on When

open,

t he

over heat

shut of f val ve al l ows engi ne

bl eed

a i r

t o

f l o wdownstreamt o

t he a n t i - i c e

modul at i ng

val ve

When t he

WSHLDHE T

swi t ch

i s

pl aced i n

t he

On

posi t i on,

a c i r c u i t i s compl et ed t o

t he a n t i - i c e modu-

l a t i n g

val ve and

WSHLDHT

i ndi cat or

l i g h t

The

a n t i - i c e modul at i ng

val ve

wi l l

movet owar d f u l l open u n t i l t he

val ve

i s

f u l l y

open or

t he

WSHLDHE T

swi t ch i s s e t t o HOLDWhen

t he

sw t c h i s

i n

t he

HOLD

p o s i t i o n ,

t he

a n t i - i c e

modul at i ng

val ve

wi l l

r emai n

i n

i t s

l a s t

at tai ned

p o s i t i o n , and

al l owbl eed

a i r

t o t he

a n t i - i c e

heat exchanger When t he

WSHLD

HE Tswi t ch

i s

set t o OFF,

t he

a n t i - i c e

modul at i ng

val ve

wi l l

move

t owar ds

t he cl osed posi t i on

u n t i l

t he val ve

i s

f u l l y

cl osed

or t he

WSHLDHE Tswi t ch i s s e t t o HOLDThe

a n t i - i c e

modul at i ng val ve

wi l l

f u l l y open

or

c l ose i n

appr oxi mat el y

15 seconds The

a n t i - i c e

heat

exchanger cool s the

bl eed

a i r

w t h rami r r egul at edby a

ram

i r

mod-

ul at i ng

val ve

Thi s

val ve

i s cont r ol l ed by t hedownstreama n t i - i c e

duct

t emper at ur e

sensor

and

r egul at es t he

a n t i - i c e

bl eed

a i r

t emper at ur e

by

var yi ng t he

amount

of

ram

i r

al l owed

i n t o

t heheat exchanger

WHLD

HT LI GHT

The

gr een

WSHLD

HT l i g h t , l ocat ed

on

t he gl ar eshi el d

annunc i at or

panel ,

pr ovi des

t he c rew wi t h

a

vi sual i ndi cat i on o f

wi ndshi el d

heat

oper at i on

The i ght

wi l l

i l l umnate

whent he

a n t i - i c e modul at i ng val ve

i n

any

posi t i on

except

f u l l y

cl osed

and

r emai n

i l l um nat ed

u n t i l

t he

appl i cabl e

gr ound

or

i n f l i g h t

l ow- l i mt

t her moswi t ch

t r i p s

or t he

WSHLD

HE T

swi t ch i s

s e t

t o

OFF

WHLD

OV

HTLIGHT

I l l umnat i on of t he r ed

WSHLD

OVHT war ni ng l i g h t , on t he

gl ar eshi el d annunci at or panel ,

i n di c a t e s t h a t

t he bl eed

a i r

t emper at ur e

i n t he

wi ndshi el d out l et nozzl es has r eached t he

appl i cabl e

gr ound

o r

i n f l i g h t

hi gh- l i mt

t her moswi t ch

s e t t i n g

and

t he

wi ndshi el d

a n t i - i c e

systemhas been

shut down I f t he

o ut l e t

nozzl e bl eed

a i r

t emper at ur e

r eaches 250F

121C

dur i ng

gr ound oper at i on, t he gr ound hi gh- l i mt

over heat

t her moswi t ch wi l l

c l o s e

t he

a n t i - i c e over heat

shut of f

val ve

and

i l l umnate the

WSHLD

OV

HT

war ni ng l i g h t

I f t he

o ut l e t

nozzl e

bl eed

ai r t emper at ur e

r eaches

270F

132C i n f l i g h t , t he i n f l i g h t

hi gh-

l i m t over heat

t her moswi t ch wi l l per f o rm

t he

samef unct i on When

t he

PM 2 6- g

Change

3


12/45

L ea r j e t

31A

P i l o t s

Manual

nozzl e

bl eed

a i r

t emperat ur e

cool s s u f f i c i e n t l y

t he

overheat

t h e r -

moswi t ches

wi l l r e s e t and

al l ow

t he a n t i - i c e over heat

shut of f val ve

t o

open,

ext i ngui shi ng

t he

WSHLD

OV

HTwar ni ng l i g h t

To avoi d

a

f a l s e

WSHLD

OVHT

i ndi cat i on upon

l andi ng, t he gr ound

over heat t h e r -

moswi t ch

c i r c u i t r y

i s

di sabl ed

f o r

10

seconds

a f t e r

t ouchdown,

a f t e r

whi ch

nor mal

f unct i oni ng wi l l

r esume

WNDSHELD

DEFOG

W ndshi el d

i nt ernal

def oggi ng

i s accompl i shed

usi ng e l e c t r i c a l l y heat -

ed

w ndshi el d

panel s The

system desi gned t o

be

acti vat ed bef or e

t akeof f

and

r emai n

on u n t i l

shutdown

The system

consi st s

of two

w ndshi el d

panel s w t h i n t e g r a l

h e a t e r s

w ndshi el d heat

control

u n i t

system

sw t ch,

L

and

R

WS

DEFOG

annunci at ors,

and

associ at ed

a i r -

c r a f t

w r i ng

Thesystem

u t i l i z e s a

163

VACout put

f r om t he

i nver t er

system t o power t he

i n t e g r a l

heaters

The

control c i r c u i t r ecei ves

28

VDCthrough t he5 amp

LWSHLD

DEFOG

and

RWSHLDDEFOGi r -

c u i t breakers on t he

p i l o t s

and c o p i l o t s c i r c u i t

breaker panel s

WSHLDDEFOGSWTCH

The

w ndshi el d

def og system

i s

cont r ol l ed

through

t he

WSHLD

DE

FOG

sw t ch

i n t he

ANTI ICE

gr oup

on t he

cent er

sw t ch panel

The

sw t ch

has

two

posi t i ons

OFF

andOn

WSHLD

DEFOG

Wen t he

WSHLDDEFOG

sw t ch

i s s e t

t o t he On

p o s i t i o n

t he

i n t e g r a l heaters

wi l l be suppl i ed

163

v o l t s

ACpower f r omt he

i n v e r t e r

systemv ia t he

w ndshi el d

heat

control

uni t

NOTE

The

i nver t er

power i ng

t he l e f t C

bus

wi l l power t he l e f t

w ndshi el d

panel

whi l e

t he

i nver t er

power i ng

t he

r i ght

AC

buswi l l

power t he

r i g h t

w ndshi el d

panel

Normal system

oper at i on

i s

i ndi cat ed

by

i l l umnat i on of

t he L andR

WSDEFOG

annunci at or s when t he system

i s

act i vat ed w ndshi el d

t emper at ur ebel ow8 F

[27C Wen

t he w ndshi el d

i s heat ed above

80F

27C , t he annunci at ors

wi l l

exti ngui sh

PM121

6 9

Change

3


13/45

i l o t s Manual

Lear j et A

LNDRWS

DEFOG

ANNUNCIATORS

I l l umna t i on

of

a

WS

DEFOG

annunci at or ,

l ocat ed on t he

gl ar eshi el d

annunci at or panel , i ndi cat es an over - t emper at ur e condi t i on, under

t emper at ur e

condi t i on

or

l oss

of

or

D

power

Normal

oper at i ng

t emper at ur e

of

t he wndshi el d i s between 105F 41C and 120F

49C

Temperature sensor s ar e

attached t o

each wndshi el d

panel

whi ch pr ovi de t emper at ur e

dat a

t o

t he

w ndshi el d

heat cont r ol

uni t

Shoul d t he t emper at ur e

of

t he w ndshi el ddropbel ow80F

27C ,

t he

appl i cabl eWS

DEFOG

annunci at or w l l i l l umna t e t o al er t t he crew

Shoul d

t he t emper at ur e

of

t he w ndshi el d

i ncr ease

above150F 66C ,

t he

appl i cabl eWS

DEFOG

annunci at or w l l i l l umna t e and

t he

affected

w ndshi el d w l l bedeact i vat ed

When

t he wndshi el d

cool s

t o t he nor -

mal oper at i ng r ange, t he systemw l l r eact i vat e andt he

WS

DEFOG

an-

nunci at or

w l l ext i ngui sh El ect r i cal f aul t s det ect ed

by t he system

moni tor w l l cause t he affectedWS

DEFOG

annunci at or t o

i l l umna t e

LWSHLD

R

WSHLD

DEFOG

DEFOG

WSHLD

DEFOG

83

V

I N

OFF

WNDSHIELDDEFOGSYSTEM

Fi gur e 6 3

6-10

PM 2

Change

3


14/45

L e a r j e t

3 A

P i l o t s Manual

WNDSH ELD

NDR DOME

ANTI I CE L OHOLSYSTEM

The

al cohol

a n t i - i c e

system i s

u t i l i z e d

f or radome a n t i - i c e pr ot ecti on

and f o r w ndshi el d a n t i - i c i n g i n

t he event of

a w ndshi el d heat i ng s y s -

tem

mal f unct i on

Al cohol

a n t i - i c i n g

i s

accompl i shed

by

di r ect i ng

met h-

y l

al cohol

over

t he

p i l o t s

w ndshi el d sur f ace

through

anext er nal

o ut l e t

i n t he

w ndshi el d heat o ut l e t

nozzl e

assembl y

and

through an o ut l e t

nozzl e assembl y on t he radome Thesystemconsi sts o f a 1

. 7 5

gal l on

6 6 l i t e r )

al cohol

r e s er v o i r , a

f l o a t

sw tch,

af i l t e r a

r e l i e f

val ve, at h r e e -

waycontrol val ve,

a

bl eed

a i r

shut of f and

pressure

r egul at or val ve,

a

systemsw t ch,

an

amberL LOWaut i on l i g h t ,

and

associ at ed a i r -

c r a f t w r i ng The pressure

r e l i e f

val ve i s i n s t a l l e d t o pr event system

over pr essur i zat i on

by

vent i ng system

pressure

gr eat er

than 2 6

psi

17

9

kPa

above

ambi ent ,

and

bl eed

system

pressure whent he

system

i s o f f Thesystem

control

c i r c u i t s oper at e on28VD suppl i ed t hr ough

t he

5 amp

ALC SYS

c i r c u i t

br eaker

on

t he

c o p i l o t s

c i r c u i t

breaker

panel

L OHOL

SWTCH

The

al cohol

a n t i - i c e systemi s

cont r ol l ed

by

t he

three

posi t i on

ALCO

HOLsw t ch

on

t he cent er sw t ch

panel

When t he sw t ch i s

s e t

t o WS/

RAD

c i r c u i t s

ar e

compl et ed

t o

open

t he

shut of f

and

pressure

r egul at or

val ve

and

posi t i on t he t hr ee- way

control val ve f o r al cohol f l o w t o

t he

w ndshi el d andradome Theal cohol

r e s er v o i r ,

pr essur i zed

t o

appr oxi -

mat el y

2

4 psi 16 . 5 kPa above ambi ent t hr ough

t he shut of f

and

pres-

sure

r egul at or val ve, suppl i es al cohol t o t he

w ndshi el d

out l et and

radomenozzl es through

a

f i l t e r

and

t he t hr ee- way control

val ve

When

t hesw t ch

i s s e t t o

RAD t he t hr ee- way val ve

wi l l

posi t i on

t o suppl y

a l -

cohol

f l o w

t o t he

radome onl y

When t he sw t ch i s

s e t

t o

OFF,

t he shut -

o f f

and

pressure

r egul at or

val ve

wi l l

c l o s e,

t he

t hr ee- way

val ve wi l l

r eposi t i on

t o cut

o f f f l o wandsystempressure wi l l

bl eed

o f f t hr ough

t he

pressure r e l i e f val ve

L

LOW

AUTI ON

LI GHT

I l l umnat i on of t he amberL LOWi ght , l ocat ed on t he gl ar eshi el d

annunci at or

panel , i n d i c a t e s

t he

al cohol

suppl y i n t h e r eser voi r

i s l ow

The

r eser voi r

f l o a t

sw t ch

wi l l

i l l umnate t he

l i g h t t hr ougha

r el aywhen

i n t he f u l l down

posi t i on

When t he r e l a y i s ener gi zed, ahol di ng

c i r c u i t

i s

a l s o

ener gi zed

t o

pr event

t he

l i g h t

f r o m

f l i c k e r i n g

due

t o

t he

bobbi ng

mot i on o f t he

f l o a t

Thehol di ng

c i r c u i t i s

deener gi zed

when

t he

BAT-

TERYsw t ches a r e s e t t o OFFand t he

al cohol

r eser voi r

i s

f i l l e d

com

pl et el y f i l l e d

r eser voi r

wi l l suppl y

t he

al cohol a n t i - i c e

syst em w th

appr oxi mat el y 45 m nut es

o f al cohol

f l o w

when pr ovi di ng

pr ot ecti on

f o r

both

t he

w ndshi el d

and radome

or

appr oxi mat el y 2hour s

f or

r a -

dome onl y

PM121

6

11

Change

3


15/45

P i l o t s

Manual

ear j et

3 A

PNEUMATIC

I R PRESSURE

ALCOHOLSUPPLY

OVERBOARDVENT

ELECTRCAL

CHECKVALVE

PRESSURE

RELIEF

VALVE

ALCOHOL PRESSUREREGULATOR

8

SHUTOFF VALVE

L OHOL

ANTI -ICESYSTEM

Roar

6 4

THREE WAY VALVE

FILTER

FLOAT

SWTCH

J

Q

W

Z

O

>2W

W

O>

m

6

2

PM 2

Or i gi nal


16/45

Lear j et

3 A

Pi l ot s Manual

PITOT STATIC

N

TALLW RNNGNTI ICE

Ant i - i ce

pr ot ec t i on f or t he

p i t o t - s t a t i c probes,

t o t a l

t emper at ur e probe,

and s t a l l war ni ng

vanes,

i s acc ompl i shed

by

ener gi zi ng

i n t e gr a l e l e c -

t r i c a l heat i ng

el ement s

i n

each

component

The

i ndependent

p i t o t -

s t a t i c

probe, t o t a l t emper at ur e probe,

ands t a l l war ni ng vane

a n t i - i c e

s yst ems consi st

of cont r ol sw t ches, probe

h e a t e r s

wane

h e a t e r s and

p i t o t heat moni t or s Bot h l e f t

and

r i g ht

syst ems u t i l i z e t he

same

PI -

TOT

HT

l i g h t The

p i t o t - s t a t i c

probe

heat i ng

el ement s r ecei ve

28 VDC

t hr ough

t he r espect i ve 15- amp

L

andRPTTO

T

HTc i r c u i t

breakers on

t he p i l o t s and

c o p i l o t s

c i r c u i t br eaker panel s

Mot

heat systemi s op-

erat i ve

dur i ng

EMERBUSmode The

t o t a l t emper at ur e

probe

heat i ng

el ement

r ecei ves

28 VDC

hr ough

t he

5 amp

T T

PROBE

HT

c i r c u i t

breaker

on

t he

p i l o t s c i r c u i t

breaker

panel

The

s t a l l

warni ng

vane

heat i ng

el ement s r ecei ve

28

VDC

t hr ough

t he r espect i ve 10- amp L

andR

STALLV NEHTc i r c u i t

breakers

ont he

p i l o t s

and c o p i l o t s

c i r c u i t

br eaker panel s

PI TOT

HEAT

SWTCHES

The


heat s yst ems

are i ndi vi dual l y

cont rol l ed t hr ough t he

MOTHEAT

sw t ches

i n t he

ANTI ICE

gr oup ont he center

s w t c h

panel

Each

s w t c h

has

twoposi t i ons

On

L or R) and

OFF

When

t he

LandRMOT

HEATsw t ches ar e

s e t

t o On LandR) , power

i s

sup-

p l i e d t o each


probe

heater, each s t a l l warni ngvaneheater,

andt he t o t a l t emper at ur e

probe

heater

PI TOT HTLI GHT

dual p i t o t heat moni t or

systemi s

i n s t a l l e d

t o a l e r t t he

p i l o t

i f i nsuf -

f i c i e n t

current

i s

bei ng

appl i ed

t o

t he


probe

heat i ng

el e-

ments The moni t or s

ar e

w r ed t o t he

ground

s i de of t he p i t o t - s t a t i c

probe

heat i ngel ement s

Each

moni t or

i s basi cal l y

a

rel ay

whi ch

mai n-

t ai ns

an

open

c i r c u i t

f o r t he PITOTHT l i g h t as l ong as s u f f i c i e n t cur-

rent i s

bei ng

appl i ed t o t he

associ at ed


probe

heat i ng el e-

ment

I n t he

event

of a

mal f unct i on

i n or l o s s of power t o t he

associ at ed


probe heat i ng

el ement ,

t he

rel ay wi l l r el ease

and

compl et e

t he

PITOTHT

l i g h t

c i r c u i t

I l l um nat i on

of t he amber

PI TOTHTl i g h t i n

t he gl ar eshi el d annunci at or panel , i ndi cat es

amal -

f unct i on

i n

e i t he r

t he

l e f t

or

r i ght


heat

system

or

that at

l e a s t onePITOTHE T

s w t c h

i s

OFF

PM 2

6 3

Change l


17/45

P i l o t s

Manual

Lear j et

31A

OXYGEN

SYST M

The ai r c r af t oxygen system

pr ovi des

oxygen ser vi ce f or

t he

crewand

passenger s Thesystemconsi st s of t he crewand

passenger

di st r i but i on

syst ems,

a

hi gh- pr essur e

oxygen

st or age

cyl i nder,

a

shut of f

val ve

and

pressure

r egul at or

assembl y, an

oxygen pr essur e gage,

an overboard

di schar ge r e l i e f val ve and i ndi cat or , an oxygen aner oi d sw t ch, a pas-

senger

oxygen

cont r ol val ve,

l anyar d actuated passenger

mask

oxygen

val ves, andcrewandpassenger oxygenmasks El ec t r i cal power t o

op-

e ra te t he

passenger

oxygen cont r ol val ve i s suppl i ed through t he 75

ampOXYVALVE

ci r c ui t

br eaker

on t he pi l o t s c i r c ui t

br eaker

panel

Oxygen

i s avai l abl e

t o

t he

crewat a l l t i mes and

canbe

made

avai l abl e

t o

t he

passenger s

ei t her

aut omat i cal l y

above

14, 000

750

f eet

cabi n

a l

t i t ude,

or

manual l y at

any al t i t ude

through t he use

of

t he cockpi t con-

t r o l s

on

t he p i l o t s

si dewal l

The

oxygen

system

s desi gned

f or

use

duri ng

emergencydescent t o a cabi n al t i t ude

not r equi r i ng

oxygen

and

i s not t o

be

used f or

extended

per i ods of f l i g h t at cabi n al t i t udes r equi r -

i ngoxygen

or as

a subst i t ut e f or t he normal

pr essur i zat i on

system

Pas-

senger masks

w l l

not

pr ovi de suf f i c i ent oxygen

f or prol onged

oper at i on

above

34, 000 f e e t cabi n al t i t ude

Prol onged

oper at i on

above

25, 000

feet cabi n al t i t ude wth passenger s onboard i s not recommend

ed Smoki ng

i s

pr ohi bi t ed

when

oxygen

i s

i n

use

Ref er

t o

t he

F

Ap

proved

Ai r pl ane

Fl i ght Manual f or l i m t at i ons and oper at i ng

pr ocedur es

OXYGENSTOR G N R SSUR

R GUL TOR

Theoxygenst or age

cyl i nder

has

a

st or age

capaci t y of 4 cubi c f eet 1. 13

cubi c met er s at

1800 psi

12, 411

kPa The

cyl i nder

i s l ocat ed i n t he dor -

sal f i n

or

t he

r i ght

si de

of

t he

nose

compartment

The

shut of f

and

pr es-

sure

r egul at or assembl y forms an i nt egr al

par t of

t he st or age

cyl i nder

and

pr ovi des

f or pr essur e r egul at i on, pressure i ndi cat i on, and servi c-

i ng Oxygen pr essur e i s avai l abl e t o t he passenger andcrewdi st r i bu-

t i on

systems and i s r egul at ed

t o

a

pressure

of 6 t o 8 psi 418 t o 552

kPa when t he oxygen cyl i nder shut of f val ve

i s open The shut of f

and

pr essur e

r egul at or assembl y

al so i ncor por at es

a

bur st

di sc pressure r e

l i e f

val ve t o

di schar ge t he

oxygen cyl i nder cont ent s

overboard

i n

t he

event that cyl i nder pr essur e r eaches 2700 t o psi 18, 617 t o 20, 685

kPa Shoul d t he

cyl i nder cont ent s

be di schar ged over boar d, t he gr een

overboard di schar ge

i ndi cat or ,

on t he

out si de

sur f ace

of

t he a i r c r a f t

near t he st or age cyl i nder , w l l be ruptured or m ssi ng

6- 14

PM121

Change

3


18/45

ear j et

3 A

i l o t s

Manual

REW

M SK

OXYGENSYSTEM

S HEM TI

Fi gure

6 5

PM 2 6 5

r i gi nal


19/45

P i l o t s Manual

Lear j et 31A

OXYG NPRESSUREG G

The

oxygen pressure gage

i s

l ocat ed

on

t he

p i l o t s

si dewal l

Thegage

i s

cal i br at ed

from

0t o

2000

psi Thegage

i s

a

di r ect - r eadi ng t ype t h a t

i s

pl umbed

t o

t he

hi gh- pr essur e

si de of t he

r egul at or

and

i ndi cat es

oxygen

cyl i nder

pressure

onl y

OXYG NSYSTEM

COCKPI T

CONTROLS

The

oxygen

systemcockpi t

cont r ol s

consi st

of

one

cont r ol val ve, l a-

bel ed

PASSENGEROXYG NOFF AUTODEPLOY l ocat ed

on

t he

p i l o t s

si dewal l

above

t he

armest

Thecont r ol

val ve

cont r ol s

oxygen

a v a i l a b i l i t y

t o t h e passenger

oxygen

di st r i but i on systemandpr ovi des

aut omat i c

or manual mode s e l e c t i o n

Oxygen

i s

avai l abl e t o t he c rew

oxygen

di st r i but i on systemat al l

t i mes

when t he

oxygen

cyl i nder

shut of f

val ve

i s open

Cont r ol posi t i ons

and

system f unct i ons ar e

as

f ol l ows

1

Wth

t he

PASSENGER

OXYGEN

val ve

i n t he UTOposi t i on,

oxygeni s

avai l abl e

t o t he passenger di st r i but i on systemandt he

aneroi d- cont r ol l ed

sol enoi d

val ve

wi l l

depl oy

t he

masks

aut o-

mat i cal l y

Shoul d

t he cabi n

a l t i t u d e

reach

14, 000 750

f e e t t he

aner oi d swi t ch

wi l l

open t he

sol enoi d

val ve, t he passenger

oxy-

genmasks

wi l l

depl oy,

and

t he

upper cent er panel

l i g h t s wi l l l

l um nat e

t o

pr ovi de

maxi mum

v i s i b i l i t y

f or

donni ng masks

Nor mal l y, t he cont r ol shoul d

be

i n t h i s posi t i on

2 Wth

t he PASSENGEROXYG Nal ve i n t h e

DEPLOY

p o s i t i o n

oxygen i s

avai l abl e

t o t he passenger di st r i but i on

system

and

t he

passenger

masks

wi l l

depl oy

The sol enoi d

val ve wi l l be

by-

passed andal l ow

oxygen

systempressure t o depl oy

t he

passen-

ger

masks

Thi s posi t i on can

be

used t o depl oy t he passenger

masks

at

any

cabi n

a l t i t u d e andmust be

used

i f el ec t r i c al power

i s unavai l abl e

3 Wth t he PASSENGER

OXYG Nal ve

i n t he

OFF

p o s i t i o n oxy-

gen

i s not avai l abl e t o t he passenger di st r i but i on systemregard-

l e s s

of cabi n

a l t i t u d e Thi s

posi t i on

can be used when

oxygen i s

r equi r ed f or t he c rewonl y

6 16

PM 2

Or i gi nal


20/45

L ea r j e t

A

P i l o t s Manual

PASSENGERMASKS

Passenger

oxygen

masks

ar e st owed i n compar tment s i n the cabi n

c e i l i n g

upper - cent er panel

Whenever

t he

compartment

door s

open

automat i cal l y

PASSENGER

OXYGEN

AUTO

or

manual l y

PAS-

SENGER

OXYGEN

DEPLOY ,

oxygen

i s

avai l abl e

f or

passenger

use

Passengers shoul d donmasks andmust

pul l

l anyard

to

i n i t i a t e

oxy-

gen

f l ow

An

o r i f i c e i s i ncorporat ed

i n t hemask to

pr ovi de aconstant

f l owof 4 1 l i t e r s per

mnute

The

rebreather

bagwi l l

i n f l a t e at

a

seem

i ngl y

s l ow

r a t e whenoxygen

i s

f l ow ng Thi s

i s

normal

Shoul d t he

compartment door be i nadver t ent l y

opened

from

t he

c o c kp i t pres-

suremust be bl ed from

t he systemby

pul l i ng

one

of

t he l anyar ds be-

f o r e

t he

masks

can

be r est owed The

compartment

door s can

be

opened

manual l y

f or

mask

cl eani ng

and

ser vi ci ng

by

rel easi ng

t he

l a t c h

l abel ed

OXYGEN

adj acent t o each

door

When t he

door s

ar e

openedusi ng t h i s met hod

nooxygen

f l ow

i s avai l abl e t o t he

masks

PASSENGER

MASK

Fi gure

6 6

PM 121

6-17

Or i gi nal


21/45

P i l o t s

Manual

Lear j et

31A

REW

M SKS

The

s t andar d

6600214 s e r i e s ) f l i g h t

crew

masks

ar e s t owed

on

straps

behi nd t he p i l o t s andc o p i l o t s

s e a t s

Opt i onal

S c o t t

ATO

M

10- 15-

0 1 ) f l i g h t crewmas ks , s t owed i n access i bl e

storage r ecept acl es

on

t he

p i l o t s

and

c o p i l o t s

si dewal l s, may

r epl ace

t he s t andar d

crew

masks

Thepressure

demandmask

r egul at ors pr ovi de f o r

nor mal , 100

96 oxy-

gen and

emer gency

oper at i on r e f e r

t o t he FAA

Approved

Ai r pl ane

F l i ght Manual f or det ai l ed oper at i onal

procedures)

Each

mask

i n c o r -

por at es a

m cr ophone

cont rol l ed

byt he

MCSELECT

s w t c h ont he

au-

di o cont r ol panel s

Ane l e c t r i c a l cord

ext ends

f r o meach mask and i s

pl ugged i nt o t heOXYMC ack

on

t he j a c k

panel

Communi cati on

be-

tweencrew

members

can beaccompl i s hed by

us i ng t heOXYf unct i on

of

t he

MC

SELECTs w t c h

on

t he

audi o

cont r ol

panel s

ressure de-

t e c t o r i s i n s t a l l e d

i n

each

maskoxygen s uppl y l i n e t o show

v i s i b l e v e r -

i f i c a t i o n of

oxygen

pressure

t o t he mask

qui ck- di s connect

i s

provi ded

f or

each

crewmember When t he mask bayonet

i nsert ed

i nt o t he

qui ck- di sconnect , aspr i ng l oaded

poppet moves

of f

i t s

seat

and

al l ows

oxygenf l o w

i nt o t hemask

suppl y

l i n e

REWM SK66 214SERIES

Fi gure

6 7

6 18

PM121

Change

4


22/45

L ea r j e t

A

P i l o t s Manual

PRESSURIZ TION

SYSTEM

Cabi n

pr essur i zat i on i s

pr ovi ded by

condi t i oned

a i r ent er i ng

t he cabi n

t hr ough

t he

a i r

di st r i but i on

duct s

and cont r ol l ed

by modul at i ng

t he

amount of a i r exhaust ed f r o mt he

cabi n

Thepr essur i zat i on systemcon

s i s t s

of

a

cabi n

pr i mar y

out f l ow

val ve

a

cabi n

safety

val ve

d i f f e r e n t i a l

pressure r e l i e f val ves cabi n

a l t i t u d e

l i m t e r s a vacuumshut of f

s o l e -

noi d val ve apr essur i zat i on vacuum e gu l a t o r

a

pr essur i zat i on mod

ul e

two

bl eed ai r shut of f

val ves twoemer gency pr essur i zat i on val ves

cabi n

a l t i t u d e

war ni ng andemer gency

pr essur i zat i on

aner oi d swi t ch

e s

two

emer gency

pr essur i zat i on

over r i de

sw t ches

an amber C B

ALTcaut i on

l i g h t andanaur al warni ng

systemAl l systemcont r ol s

ar e

l ocat edon

t he pr essur i zat i on

andc o p i l o t s swi t ch

panel

Al l systeman

nunci at or s

ar e l ocat ed

on

t he

gl ar eshi el d

annunci at or

panel

Power

f o r

t he cont r ol c i r c u i t s i s

28

VDCsuppl i ed t hr ough t he 7. 5 amp

PRESS

CONTc i r c u i t

br eaker on

t he

c o p i l o t s c i r c u i t br eaker

panel

and

t he t -

ampCABIN

ARc i r c u i t

br eaker l ocat ed on t he

p i l o t s

c i r c u i t br eaker

panel

CREWM SK SCOTT

TO

15 1

Fi gure

6 S

PM 121

6 19

Change 4


23/45

P i l o t s

Manual

L ea r j e t

3 A

NORM L

PRESSURI ZATI ON

Normal pr essur i zat i on i s cont r ol l ed by

r egul at i ng cont r ol

pressure t o

t he

cabi npr i mar y

out f l ow

val ve

The

control

pressure

may

be r e gu l a t -

ed

aut omat i cal l y by t he CABI NCONTROLLERor manual l y

by

t he

manual

UP DN

control

l ever

r essur i zat i on

vacuum

egul at or i n t he

t a i l c o n e pr ovi des

r egul at ed vacuum

servo

pressure to

operate

t he

val ve

W t h t he

squat

s w t c h

i n

a i r mode and

t he pr essur i zat i on AUTO

M N

w t c h

i n AUTO t he

a i r c r a f t

pr essur i zat i on

system s compl et el y

i ndependent o f t he a i r c r a f t

e l e c t r i c a l system I f

t he

a i r c r a f t i s

i nadver t -

ent l y

al l owed t o ascend andexceed t he

cont r ol l i ng

l i m t s

of t he pres-

sur i zat i on c o nt r o l s

t he nor mal d i f f e r e n t i a l

pressure

r e l i e f

val ve

wi l l

cause

t he

pr i mar y

out f l ow

val ve

t o open

and

mai nt ai n

a

9 . 4

psi 64

. 8

kPa d i f f e r e n t i a l

Shoul d t he

nor mal d i f f e r e n t i a l pressure r e l i e f

val ve

f i l

t he

maxi mum

i f f e r e n t i a l

pressure

r e l i e f

val ve

w i l l

modul at e

t he

cabi n

safety

val ve

t o mai nt ai n

a9

7 psi 67 kPa d i f f e r e n t i a l Cabi n

a l t i -

t ude l i m t e r s

ar e

i n s t a l l e d i n t he

servo

pressure vacuum i ne s

t o

t he p r i -

mary out f l ow val ve and

cabi n safety

val ve t o l i m t

cabi n

af t i t ude t o

11, 500

f e e t shoul d a d i f f e r e n t i a l

r e l i e f

val ve

f a i l

and

a l l ow

t he

pr i mar y

out f l owval ve or cabi n

s a f e t y

val ve t o r emai n

open

Shoul d

t he cabi n

al -

t i t ude

reach

11, 500 f e e t t he

a l t i t u d e l i m t e r s wi l l

vent

cabi n

pressure

t o

t he

pr i mar y out f l ow

val ve

and cabi n s a f e t y

val ve control

chamber s

causi ng

t he

val ves

t o

c l o s e

Shoul d

a

r api d descent

cause

a

negat i ve

pressure i n t he cabi n, both t he

pr i mar y

out f l ow

val ve

and

cabi n

safety

val ve

w i l l open t o vent ambi ent at mospher i c pressure t o

t he

cabi n

EMERGEN YPRESSURI ZATI ON

I n t he event of nor mal cabi n a i r f l ow

mal f unct i on,

emer gency pressur-

i zat i on i s pr ovi ded by r out i ng

engi ne bl eed a i r

d i r e c t l y

i n t o t he

cabi n

t hr ough

t he emer gency pr essur i zat i on val ves

Emergency

pr essur i za-

t i o n

i s accompl i shed aut omat i cal l yby

pr essur i zat i on

aner oi d sw t ches

whent hecabi n

a l t i t u d e i ncr eases

t o

9500

250

f e e t

or

manual l y

by

s e t -

t i ng t he BLEED

AIR

sw t ches t o EMERTheemer gency pr essur i zat i on

val ves wi l l

open, t he bl eedai r

shutoff /pressure

r egul at or val ve

wi l l go

t o t he l ow- pr essur e s e t t i n g duct i ng

engi ne

l ow- pr essur e

bl eed

a i r d i -

r e c t l y i n t o t he cabi n a i r

si dewal l

andf l o o r d i f f u s er s

Thi s bypasses t he

condi t i oned

a i r

pl umbi ng i n t he

t a i l c o n e

areato maxi m ze

t he

i nf l ow

of

bl eed

a i r

t o t he

cabi n

Theemer gency pr essur i zat i on val ves ar e deener -

gi zed

t o t he open

pos i t i on f or

emer gency a i r f l ow, andener gi zed

cl osed

f or

nor mal

bl eedai r

f l ow

Each

val ve

i s

i ndependent

of

t he ot her and,

whenever

bot h val ves ar e

open,

t emper at ur e control and

bl eed

a i r f o r

w ng, andw ndshi el d a nt i - i c e wi l l be unavai l abl e Oper at i ng power f o r

emer gency

val ve

act uat i on

i s

28

VD uppl i ed t hr ough

ei t her t he

7 5 -

ampL

and

REMERPRESSc i r c u i t br eaker s on t he p i l o t s

and c o p i l o t s

c i r c u i t

br eaker panel s Power f o r emer gency

val ve act uat i on

i s a v a i l -

abl e dur i ng EMER

BUS

mode

6-20

PM 121

Change

3


24/45

e a r j e t

3 A

PM 2

Or i gi nal

vkvF

SOFHd~

mi F

SivrKVOar

PRESSURZ TIONSYSTEMS HEM TI

Fi gure

6 9

P i l o t s Manual

6 2


25/45

P i l o t s Manual

L ea r j e t

A

PRESSURI Z TI ON

ONTROLS

N

NDC TORS

BLEED I RSWTCHES

The

L

and

R

BLEED

IR

swi t ches, l ocat ed

on

t he

c o p i l o t s

swi t ch panel ,

cont r ol t he respect i ve l e f t and

r i ght

bl eedai r shut of f

/pressure

r egul a-

t o r

val ves

on t he engi ne and l e f t and

r i g ht

emer gency pr essur i zat i on

val ves i n t he

bl eed a i r duct i ng

Each BLEED

I R

swi t ch has t hr ee pos i -

t i ons

EMER ON and

OFFWen

a

BLEEDIRswi t ch i s

i n t h e

ONo-

s i t i o n ,

t he r espect i ve bl eedai r

shut of f / pr essur e

r egul at or val ve wi l l

openandt he emer gency

pr essur i zat i on

val ve

wi l l

r emai n cl osed unl ess

t he 9500- f oot

emergency

pr essur i zat i on

aner oi d swi t ches

ar e act i vat ed

WenaBLEED

IR

swi t ch

i s s e t

t o

OFF,

t he r espect i ve bl eedai r shut -

of f /p ressure r egul at or

val ve

wi l l

be

ener gi zed

t o

t he

cl osed

pos i t i on

Wen

aBLEED IRswi t ch i s s e t t o

EMER

t he

r espect i ve

bl eedai r


r egul at or

val ve

wi l l suppl y

l ow- pr essur e

bl eed

a i r

and

emer gency pr essur i zat i on

val ve wi l l

be deener gi zed

open The

bl eedai r


r egul at or

val ves

control

bl eed

a i r f l o w

t o t h e

cabi n a i r d i s t r i b u t i o n and t emper at ur e

control

system

wng

a n t i - i c e

system

and

wi ndshi el d a n t i - i c e syst em

The

bl eedai r shut of f /pressure

r egul at or

val ves wi l l c l o s e

aut omat i cal l ywhenever

t he r espect i ve

ENG

FI RE

PULL

T

handl e

i s

pul l ed

Bl eedai r f or

wi ndshi el d

al cohol

t ank


s t l l

avai l abl e

wi t h

t he


r egul at or

val ves

cl osed

TheBLEED IRswi t ches

r emai n

e f f e c t i v e

dur i ng

EMER

BUS

mode

BLEED I R

W RNNG

LI GHTS

RedBLEEDI R

L

and

BLEED

IR

Rwar ni ng l i g h t s

on

t he gl ar eshi el d

annunci at or

panel ,

pr ovi de

t he

cr ew wi t h

vi sual

i ndi cat i on of a

pyl on

over heat

condi t i onor

pyl onbl eed

a i r

duct i ng

over heat condi t i on

Each

l i g h t i s

oper at ed by

a t her mal swi t ch i n t he associ at ed

pyl on

bl eedai r

duct i ng or

a

t her mal swi t ch i n t he associ at ed

pyl on

j u s t

af t of t he f o r -

ward engi ne

mount

The

duct i ng t her mal

swi t ches

c l o s e

t he duct

t emper at ur e shoul d

reach

645 10 F 34 1 [S 5 ] C ) The

pyl on

t her mal

swi t ches

wi l l

i l l umnat e the

r espect i ve l i g h t i f

t he t emper at ur e i n

a

py-

l on exceeds

250 5 F

121

[ 2. 7 ] C )

The

swi t ches

wi l l openand

t he a f -

fected BLEEDIR

Li ght

wi l l ext i ngui sh as t he

pyl on

cool s

6- 22

PM 121

Change

3


26/45

L ea r j e t

A

P i l o t s

Manual

C BAI R

SWTCH

TheC B

AIRswi t ch on t he

pr essur i zat i on cont r ol panel cont r ol s

t he

c abi n a i r

f l o w

control val ve

and

t he

pr essur i zat i on system

cabi n

safety

val ve

Dur i ng gr ound

oper at i on

when

t he

CAB

AIRswi t ch

i n

t he

OFF

p o s i t i o n

t he nor mal l y cl osed

vacuumshut of f sol enoi d ener

gi zed

open

t hr ough

r el ays

i n t he squat swi t ch

r e l a y

panel

andr egul at ed

vacuum r om

t he

pr essur i zat i onvacuum

egul at or

w i l l open

t he

cabi n

safety

val ve When

t he C BAIRswi t ch i s s et ON

t he vacuumshut of f

sol enoi d de ener gi zed

al l owi ng t he

safety val ve

t o dr i ve cl osed un

der

i ncr easi ng cabi n

pressure

C B

AI R

LIGHTOPTIONAL

Anamber

CABAIR i ght

may

be

i n s t a l l e d on t he gl ar eshi el d

annunci

a t o r panel whi ch

i l l umnat es when t he C B

AIRswi t ch i s

i n t he

OFF

pos i t i on Thi s l i g h t

serves

t o

r e mnd

c re w

members t o swi t ch C B

AIR

on

pr i or t o t akeof f

PRESSURIZATION

UTOM NSWTCH

The

UTOM N

swi t ch

on

t he pr essur i zat i on cont r ol panel

pr ovi des

aut omat i c

andmanual

mode

s e l e c t i o n

f or nor mal pr essur i zat i on When

t he swi t ch

i s s e t t oMAN, sol enoi d val ves

i n t h e r egul at edvacuumi ne s

ar e ener gi zed

t o

remove

r egul at ed vacuum

f r o m

t he

CABINCON-

TROLLERandappl y

r egul at ed

vacuum o t he

manual

control

val ve

The

control

val ve

i s manual l y oper at ed by

t he

r edUP-DN

cont r ol l ever

When t he UTOM N

swi t ch i s s e t

t oAUTO t he

sol enoi d

val ves

de

ener gi ze and a l l o w

r egul at ed

vacuum o t he CABINCONTROLLER

f o r

aut omat i c pr essur i zat i on

control

Nor mal l y

t he

UTOM N

swi t ch

r emai ns

i n

t he

UTO

pos i t i on

CABIN

CONTROLLER

W t h t he

C BAIR swi t ch ONand


UTOM N

swi t ch AUTO

t he

CABIN

CONTROLLER, l ocat ed

on

t he

pr essur i za

t i o n

control

panel w i l l aut omat i cal l y control

cabi n a l t i t u d e

The

con

t r o l l e r

senses cabi n

a l t i t u d e and r at e of cl i mb and aut omat i cal l y

modul at es

t he

pr i mar y

out f l ow

val ve

by

r egul at i ng cont r ol

servo

vac

uumpressure

Pr i or

t o t a k eo f f t he

a l t i t u de s el e c t o r

knob

on

t he

f a c e

of

t he c o n t r o l l e r shoul d

be s e t

t o s e l e c t e d

crui s i ng

a l t i t u d e

or

desi r ed

cab

i n

a l t i t u d e

TheRATE

knob

may

be

rotated t o s e l ec t

and

mai nt ai n

a

com or t abl e

pr essur i zat i on

r a t e f o r

ascent or descent For descent

and

l andi ng

t he

a l t i t u d e s e l e c t o r

shoul d

be s e t t o l andi ng f i e l d

el evat i on

PM 121

6 23

Change

3


27/45

P i l o t s

Manual

L ea r j e t

31A

PRESSURI ZATI ON

M NU L

CONTROLLEVER

UP-DN

Wth

t he C B

AI R

swi t ch ON

and

t he pr essur i zat i on UTOM N

swi t ch

i n

MAN

cabi n


cont r ol l ed

by

t he r ed UP DN

manual

control l ever

on

t he pr essur i zat i on cont r ol panel The l ever

cont r ol s servo vacuum

pressure

t o

t hepr i mar y

out f l owval ve

t hr ough

amanual

control

val ve

As t he l ever i s moved t owar ds UP out si de

s t a t i c a i r

pressure

i s vent ed

t o

t he out f l ow val ve control

chamber

causi ng t he

val ve

t o

open

Whent he l ever i s movedt owar ds

DN

cab-

i n

pressure i s vent ed

t o t he

out f l ow val ve control

chamber

causi ng

t he val ve t odose

CABIN

ALT/ DI FF PRESSG GE

The

cabi n

a l t i me t e r / d i f f e r e nt i a l pressure

gage,

ont he

pr essur i zat i on

cont r ol panel ,

i s vent ed

t o

both out si de a i r pressure

and

cabi n

a i r

pressure The

i ndi cat or

has two

poi nt er s,

each t r a v e l s over a separ at e

cal i br at ed

scal e Thel ar ge

poi nt er sweeps over

t he

out si de

scal e t o

i n-

di cat e

cabi n a l t i t u d e

The

CABI NALT

s c a l e

i s

marked f r o m0 t o

50, 000 f e e t

i n 1000- f oot i ncr ement s

The

smal l poi nt er

sweeps

over t he

i nsi de

s c a l e

t o i ndi cat e

d i f f e r e n t i a l pressure

i n psi

TheD FF

PRESS

scal e i s

marked

f r o m

0

t o

10

psi i n02- psi i ncr ement s

CABINCLIMBI NDCATOR

The

r a t e

of

change i n

cabi n

pressure al t i t ude i s i ndi cat ed i n f e e t per

m nut e

ont heCABI NCLI MB

i ndi cat or l ocat ed

on t he

pr essur i zat i on

control panel

The i ndi cat or f ace i s

marked

f r o m

0

t o 6000 f e e t per

m nut e

i n both UPandDOWNdi r ecti ons The i nst r ument

f unct i ons

si m l ar l y t o t he a i r c r a f t

v e r t i c a l speed

i ndi cat or but i s

vent ed t o

cabi n

pressure

onl y

EMER

PRESS

OVERRDESWTCHES

Emergency pr essur i zat i on

over r i de swi t ches

ar e

pr ovi ded

t o al l ow

takeoffs and

l andi ngs

a t f i e l d el evat i ons hi gher t han t he emer gency

pr essur i zat i onaner oi d swi t ch

s e t t i n gs 9500

[ 15 0 ]

f e e t Theswi t ches

ar e l ocat ed

on

t he

c o p i l o t s

swi t ch panel

and

ar e

l abel ed EMER

PRESS

OVERR DE -

NORM L

LandRWth

t he

swi t ches

i n OVERR DE po-

s i t i o n ,

t he

emer gency

pr essur i zat i on

aner oi d swi t ches ar e


i sol at ed f r o m t he

emer gency

pr essur i zat i on

val ves

t hus pr event i ng

t he

val ves f r o mopeni ng when t he aner oi d swi t ches a c t i v a t e When

t he

over r i de swi t ches

ar e i n t he NORM L

p o s i t i o n ,

act uat i on of t he

aner oi d swi t ches wi l l open

t he

emer gency

pr essur i zat i on

val ves The

swi t ches wi l l

have

no

e f f e c t

t he BLEED

AIRswi t ches

ar e i n t he OFF

or

EMER

pos i t i on

6- 24

PM 121

Or i gi nal


28/45

L ea r j e t

3 A

P i l o t s Manual

CASALT

LI GHT

Shoul d t he

cabi n

a l t i t u d e exceed 8750 250

f e e t , an

aneroi d swi t ch

wi l l

cl ose

t o

i l l um nat e t he

amber

C

ALTl i g h t

on

t he

gl ar eshi el d

an-

nunci at or panel

The

aneroi d

swi t ch wi l l a l s o deact i vat e t he

UTO

pr essur i zat i on

mode

t o

stop t he cabi n

a l t i t u d e

f rom

r i s i n g

any

hi gher

t he

mal f unct i on

was i n

t h a t

cont rol

system The

aneroi d swi t chw l l

r e -

s e t a t a l ower

cabi n a l t i t u de ,

r eener gi zi ng t he aut omat i c cont r ol system

andext i ngui shi ng

t he

CABALTl i g h t

CABN

ALTI TUDE

WRNNGHORN

cabi n

a l t i t u d e

aur al

war ni ng hor n wi l l sound t o a l e r t t he crewshoul d

t he cabi n

a l t i t u d e

reach

10, 100 250

f e e t

The

hom

s

cont r ol l ed

by

an

aneroi d swi t ch

whi chwi l l appl y a

gr ound t o t he

warni nghorn

c i r c u i t

when act uat ed The

cabi n

a l t i t u d e

war ni ng

horn

c i r c u i t

i s tested

t hr ough

t he syst em t e s t swi t ch

on

t he

p i l o t s

i nst r ument

panel

The

MUTE

swi t ch on t he

r i g h t

t hrust

l ever

maybe used

t o i nt er r upt t he

hor n

f or

appr oxi mat el y 60

seconds

i n t he

event

t he hor n sounds

The

cabi n

a l t i t u d e

war ni ng hor n i s

operat i ve

dur i ng EMERBUSmode

SYSTEM

TEST

SWTCHC IN

ALT

FUNCTION

The

rotary-type

system t e s t swi t ch on

t he

p i l o t s i nst r ument

panel

i s

used

t o t e s t t he cabi n

a l t i t u d e

war ni ng

system Rot at i ng

t he swi t ch t o

CABNALTanddepr essi ng t he swi t ch PRESSTESTbut t on

wi l l pr o-

vi de a

gr ound

si mul at i ng

t he

10, 100- f oot aneroi d swi t ch

act uat i on

Dur i ng t he t e s t sequence,MUTE

swi t ch

operat i onmay

a l s o be

checked

ARCONDTIONNGND

HE TING

Pr i mar y heat i ng and

cool i ng i s accompl i shed by cont r ol l i ng

t he

t em-

perat ur e

of

t he

bl eed

a i r

ent er i ng t he

cabi n

a i r di str i but i on

syst ems

On

a i r c r a f t 31- 035

thru

31- 190, an R f r eon- based cool i ng syst em i s i n -

s t a l l e d t o

pr ovi de

addi t i onal

cool i ng

a t

a l t i t u de s bel ow

35, 000

f e e t

and

dur i ng ground

operat i ons Ona i r c r a f t

31- 191

and

subsequent , an

R 4A

r ef r i ger ant - t ype cool i ng system i s i n s t a l l e d

t o

pr ovi de

addi t i onal cool -

i ng

An

auxi l i ar y

e l e c t r i c a l )

cabi n

heat i ng systemi s

i n s t a l l e d

t o

pr ovi de

addi t i onal

cabi n

heat i ng,

i f

r equi r ed


29/45

P i l o t s Manual

Lear j et 31A

PRM RY

HE TINGNDOOLNGBLEED R

Cockpi t

andcabi n t emper at ur e i s

r egul at ed

bycont r ol l i ng t he

t emper -

ature of


bl eed

a i r

ent er i ng t he

cabi n

a i r di st r i but i on

system

Wth

t he

BLEED

AI Rswi t ches ON

and

t he

CAB

AI Rswi t ch

ON engi ne

bl eed

a i r i s

a d m t t e d

t o t he rama i r heat exchanger

t hr ough

a f l o w

cont r ol

val ve

The

bl eed

a i r

i s

cool ed

i n

t he

heat

ex-

changer by ram

i r

ent er i ng t he

dorsal

i n l e t passi ng t hr ough t he

ex-

changer ,

and

then e x i t i n g i n t o t he

t a i l c o n e

The

condi t i oned bl eed

a i r

then

passes out

of t he exchanger i n t o t he

cabi n

a i r di st r i but i on duct s

The

t emper at ur e o f t he

condi t i oned

ai r

i s

cont r ol l ed by t he hot

a i r

by-

pass

H)

val ve Thi s

val ve bypasses

some

of

t he

bl eed ai r ar ound

t he

heat exchanger and

mxes

d i r e c t l y wi t h

t he condi t i oned

a i r

exi t i ng

t he

heat

exchanger

H- val ve

p o s i t i o n

t hus,

t emper at ur e

r egul at i on,

i s

cont r ol l ed byt he

pneumat i cal l y oper at ed

t emper at ur e

cont r ol

system

Whenever t he cabi n

t emper at ur e

UTOM Ne l e c t o r knob i s r ot at -

ed

t o AUTO

t he t emper at ur e cont r ol l er wi l l

aut omat i cal l y

mai nt ai n

t he

t emper at ur e

set wi t h

t he t emper at ur e

s e l e ct o r

Wth

t he

mode

se-

l e c t o r i n

UTO

andt he HOT COLDt emper at ur e s e l e c t o r knob s e t

t o

COLD he t emper at ur e

s e l e c t o r

needl e val ve

opens

and r educes t he

pressure t o

t he cabi n

t emper at ur e sensor The

decreased pressure

causes t he

cabi n

t emper at ur e

sensor

bl eed

pat h

t o

open

and

al l ows

t he

sensor t o vent more

of t he pressure t o

ambi ent

The

decr eased

pressure

al l ows

t he H

val ve t o cl os e andr out es bl eed

a i r t hr ough

t he

heat exchanger ,

then

i n t o

t he

cabi n

at a l ower t emper at ur e When t he

t emper at ur e s e l e c t o r

i s

s e t

t o HOTt he

t emper at ur e

s e l e c t o r needl e

val ve

cl oses and

r a i s e s t he pressure t o t he

cabi n

t emper at ur e sensor

The

i ncr eased pr essur e

caus es t he cabi n

t emper at ur e

s ens or bl eed

pat h

t o cl ose

and i ncr eases pressure t o t he

al ve

The i ncr eased

pr es s ur e al l ows t he

H- val ve

t o

openand

bypass

more

hot

a i r

i n t o t he

cabi n

di st r i but i on

system

The

cabi n

t emper at ur e

sensor s

f an

bl ows

cabi n

a i r

acr oss t he sensor, and causes t he sensor t o

met er

more or

l e s s

pressure,

dependi ng

on t he t emper at ur e

of

t he

cabi n

a i r and t he

sel ect ed t emper at ur e The

t emper at ur e sensor

f an

i s

i noper at i ve

when

t he

COOL OFFswi t ch i s s e t t o COOL When t he mode s e l e c t o r i s s e t

t o MAN t he

cabi n

t emper at ur e

sensor and

duct t emper at ur e sensor

ar e

removed

from he system and

t he

pressure

t o

t he H- val ve

i s con-

t r o l l e d

d i r e c t l y by

t he

HOT COLDt emper at ur e s e l e ct o r

Set t i ng t he

t emper at ur e s e l e c t o r t o

COLD

bl eeds of f

a

greater amount of t he reg-

ul at ed

pressure

and

al l ows

t he

H- val ve

t o

route

more

bl eed

a i r

t hr ough

t he

heat

exchanger

Set t i ng t he t emper at ur e

s e l e c t o r

t o HOT

cl oses t he

bl eed

pat h and

i ncr eases t he

pressure

at t he

H- val ve

The

val ve

opens

and

bypasses more bl eed

a i r d i r e c t l y

i n t o t he

cabi n

a i r

di st r i but i on

duct s

6 26

PM 2

Or i gi nal


30/45

ear j et

31A

i l o t s Manual

CA N

DSTRWION

BLEED

AIR

TALCONEBLEEDARDSTRIBUTION

Fi gure 6 10

CABIN

OBTIBBuno

CONDTONED

AIR

PM 121

6 27

r i gi nal


31/45

P i l o t s Manual

Lear j et 31A

C BAI R

SWTCH

The

C BAI Rs wi t c h, l oc at ed

on

t he pr es sur i z at i on c ont r ol panel ,

con-

t r o l s

t he f l o w

control val ve

Wth t he

BLEEDAI R

swi t ches ON s e t -

t i n g

t he

C B

AI R

s wi t c h

ON

wi l l

deener gi ze t he

f l o w

control

val ve

cont r ol l i ng

s ol enoi d and

al l ow

systempressure t o

t he val ve s cont r ol -

l i n g chamber s I n t e r n a l

pressures

w i l l pos i t i on t he

val ve

b u t t e r f l y

cont r ol l i ng bl eed

ai r f l o w t o

t he

heat exchanger

Set t i ng t he

C B

AI R

s wi t c h ONal s o ener gi zes

t he c abi n

t emper at ur e

sensor bl ower

S e t -

t i n g

t he

C B

AI R

s wi t ch OFF

wi l l

ener gi ze

t he val ve control

s ol enoi d

whi ch wi l l

shutoff control pressure

and a l l o w

t he val ve

b u t t e r f l y

t o

bl ock

bl eed ai r

f l o w

UTOM N

SELECTOR

An AU PO-MANmode

s e l e c t o r

l ocat ed on t he c o p i l o t s s wi t c h panel ,

pr ovi des

f or aut omat i c

or

manual

mode oper at i on

of t he c abi n

t em

perature

control

system

Wen

i n

UTO

mode

t he

system

t emper a-

t ur e cont r ol l er s

aut omat i cal l y

posi t i on t he

H- val ve

but t er f l y I n t he

M Nmode t he HOT- COLD

s el e c t o r d i r e c t l y

r egul at es t he

H- val ve

cont r ol l i ng

pressure

HOT- COLD

TEMPERATURE

SELECTOR

The HOT- COLD t emper at ur e s e l e c t o r l ocat ed

on

t he

c o p i l o t s

s wi t c h

panel

I n

systemUTOmode

t he

t emper at ur e s e l e c t o r i s used

t o

s e l e c t t he desi r ed

cabi n

t emper at ur e t o be mai nt ai ned

aut omat i cal -

l y

by

t he

t emper at ur e

control

system

I n M N

mode

t he t e

Lear 1A Anti Ice and Environmental

Documents

Transcript of Lear 1A Anti Ice and Environmental