APN-59 10 of 10

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RADAR

Search and Weather Radar (AN/APN-59) >

10 of 10

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10 of 10

Checks

After this lesson we will

be able to understand

To Connect eternalpower unit

Complete Operation

check of Search and

Weather Radar.

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RADAR


10 of 10

Foreign Object Damage

Preventable

Non-Preventable ( hail, ice,

animals, material failure)

RADAR

Search & Weather Radar Sys (APN-59) > FOD 10 of 10

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10 of 10

4

Personnel Safety

Safety harness

should be worn when

removing and

installing antenna

Search and weather Radar (APN-59) >Safety

RADAR

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10 of 10

CAUTION

Ensure that the DC

power supply output

does not exceed 115

VAC and 27 VDC at any

time as to ensure that

the displays are notdamaged

CAUTION

Ensure system power isOFF before removal or

installation of control

panel. This will prevent

component damage

caused by voltagespikes

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10 of 10

Discrepancy

Stab switch U/S.

Cause

Sys Ops Checked On

Ground Found Working

Normal.

Remedial Action

Complete wiring checked all plugs

security checked found sat. Entrysubjected to next pilot report.

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Search & Weather Radar Sys (APN-59) > Defect 10 of 10

WXR RADRA CONT PNL

RADAR

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RADAR


10 of 10

You went to shop to purchase TV, how you will be satisfied that this TV is

serviceable ?

a After checking of all TV functions only

b After checking of physical damage of TV only

c After checking of physical damage and functions of TV

d Believe on shopkeepers statement

Q & A

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RADAR


10 of 10

Checks

Visual operational

check procedure

Connect eternal power

unit

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10 of 10

Visual operationalcheck procedurePre procedure warning

Before starting theAN/APN-59 Transmitter,ensure that

Hazard warning signsare posted 40 feetfrom nose radome

In 40 feet area

No personnel grouping

Powered AGE removed

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Checks

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RADAR


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Visual operationalcheck procedure

Pre procedure warning


External powerposition

Upwind from the A/C fuelvent sys

Distance 50 feet fromA/C

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Checks

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RADAR


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Visual operationalcheck procedure

Pre procedure warning


Dont point the

energy beam toward

inhibited structures

or other personnel

grouping

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Initial Control Position

On C-1242 / AN/APN-59

RANGE Knob on 3-30/1

FUNCTION Switch on

OFF

TEST Meter Knob on

LINE

SCAN OFF

HDG SEL on Zero

GAIN Fully CCW

12

Checks

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Visual operationalcheck procedureInitial Control Position

On C-1242 / AN/APN-59

TILT Zero

STC CCW

STAB OFF

FTC OFF

IAGC OFF

PATT on FAN

BEARING STAB onREL

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Time delay check

Function switch on

STDBY

Allow 3 to 5 minutes

warm up time

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Checks

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RADAR


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Visual operational

check procedure

Time delay check

On test meter

Indication 0.6 0.2

mill ampere and

steady

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Time delay check

Note

Make sure HD 150

vaneaxial fans areoperating properly

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Checks

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RADAR


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Visual operational

check procedure

Magnetron current

check

Function switch on

SEARCH

Test meter switch to

MAG

Select each range one

by one and observe

Indication between

0.4 and 0.8 mill

ampere and steady

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Checks

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Visual operational

check procedure

Mixer and AFC current

check

RANGE switch on 3-

30/5

TEST METER switch to

MIXER 1 and 2 and AFC

1 and 2 one by one

Indication between 0.4

and 0.8 mill ampere

Reading must balance

within 0.2 mill ampere

of each other

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Preliminary Indicator

check

RANGE switch on 3-30/1

Adjust INST control onboth indicators CW untilsweep just appear

Adjust RANGE MKScontrol CW until range

marks just appear

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Preliminary Indicator

check

Observe on indicators

Trace appear

2 to 3 range marker

3-30/1 lamp ON

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Checks

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10 of 10

Visual operational

check procedure

range Marks and Range

Lamps checkOn C/UnitSelect different ranges

On indicators330 control CCW

Observe on indicator

RANGE # of range

marks

3-30/1 2 or 3

3-30/5 None

50/10 4 or 5

100/20 5 or 6

240/30 8 or 921

Checks

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Visual operational

check procedure

range Marks and Range

Lamps checkOn C/UnitRange SW on330 /1

On indicators330 control CW

Observe on indicator

o Minimum 25 rangemarks

NoteIf strobing is encountered,

rotate range 3-30 controlCCW turn

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Checks

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Visual operational

check procedure

Sweep Delay Circuits

check

On C/Unit

SCAN on PPI

On indicators

Sweep rotate CW 457

Rotate RANGE DELAY

Control slowly in CW andobserve

Variable range mark ringshould appear as anexpanding circle

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Checks

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Visual operational

check procedure

Sweep Delay Circuits

check

On indicator

RANGE DELAY SW ON

Rotate RANGE DELAYControl fully CCW

3-30 control fully CWand observe

o 3-30 lamp and TDlamp illuminate

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Checks

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RADAR


10 of 10

Visual operational

check procedure

Focus controls check

On indicator

Adjust FOCUS control toobtain sharp trace

25

Checks

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RADAR


10 of 10

Visual operational

check procedure

Sweep rotation check

On C/Unit

Bearing SW on REL

On indicator

On Main Instrumentpanel indicator S-R SWto R position

Sweep rotate CWdirection (RPM 45 7)on both indicators

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Checks

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Visual operational

check procedure


On indicator

On Main Instrument

panel indicator S-R SWto S position


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Checks

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Visual operational

check procedure


On C/Unit

Bearing SW on STAB

On indicator


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Visual operational

check procedure

Heading marker check

On C/Unit

Bearing SW on REL

On indicator

Heading marker controlfully CCW and observe

Bright heading marker

appear at 0 2on bothindicators

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Checks

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Visual operational

check procedure

Gain Control circuit

check

On C/Unit

Rotate gain control CWand observe

On indicator

Noise level increases

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Checks

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RADAR


10 of 10

31

Personnel Safety

Safety harness

should be worn when

removing and

installing antenna

Search and weather Radar (APN-59) >Safety

RADAR

31

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RADAR


10 of 10

CAUTION

Ensure that the DC

power supply outputdoes not exceed 115

VAC and 27 VDC at any

time as to ensure that

the displays are not

damaged

CAUTION

Ensure system power is

OFF before removal or

installation of controlpanel. This will prevent

component damage

caused by voltage

spikes

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RADAR


10 of 10

SUMMARY

To Connect eternal power unit to Aircraft Complete Operation check of

Search and Weather Radar (APN-59).

Search and weather Radar (APN-59) > 10 of 10

RADAR

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Q & A

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Q. SCAN switch On PPI and mode switch on WRN, Antenna RPM will be

a 45 7

b 10 to 15

c Depend on target range

d Depend on target mode

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Q & A

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If radar range is 3-30/5 is selected on control panel and 3-30 control on IP-239

indicator is fully CCW, how many range marks appear on indicator ?

a 2 or 3

b None

c 4 or 5

d 5 or 6

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Q & A

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AN/APN-59 radar system S/R function is active on ?

a IP-239 indicator installed on main instrument panel

b IP-268 indicator installed on main instrument panel

c IP-239 indicator installed on Navigator station

d IP-268 indicator installed on Navigator station

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Q & A

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In AN/APN-59 radar system HDG SEL knob is effective when?

a STAB switch is on STAB position

b BEARING STAB switch is on REL position

c BEARING STAB switch is on STAB position

d STAB switch is in down position

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Q & A

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RADAR


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End

APN-59 10 of 10

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