Download - Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Transcript
Page 1: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Land

ing

Gea

r and

Bra

kes

4I-1

BE

EC

HJE

T

400A

B4C

RH

-LG

001I

FLAP FOLLOW-UPSWITCH UNIT

ING GEAR WARNING

RIGHT GEARACTUATINGCYLINDER

RIGHT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

DING GEAR

DOORCLOSELOCK

RELEASECYLINDER

EMERGENCYDOOR CLOSE

HUTTLEVALVE

NITROGENBOTTLE

EMERGENCYCONTROL

VALVEVENT

RIGHT DOORACTUATINGCYLINDER

FLAP FOLLOW-UPSWITCH UNIT

ING GEAR WARNING

RIGHT GEARACTUATINGCYLINDER

RIGHT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

DING GEAR

DOORCLOSELOCK

RELEASECYLINDER

EMERGENCYDOOR CLOSE

HUTTLEVALVE

NITROGENBOTTLE

EMERGENCYCONTROL

VALVEVENT

RIGHT DOORACTUATINGCYLINDER

Beechjet 400A Developed for Training PurposesSeptember 2001

Landing Gear System

WARN HORNCUT

BEECHJET

RL

NOSE

UPLOCKRELEASECYLINDER

SILENCE

GEARWARN

DOWN

RELLOCK

CABIN PRESS

LDG GR

DN

UP

CABIN DUMP

DOWNGEAR

EMER

R ENGOFF

L ENGBOTH NORM

BOTH HIGH

ON/OFFBLOWERVENT

LEFT AND RIGHTTHRUSTSWITCH

SWITCHGROUND SAFETY

LANDING GEAR

DUMPVALVE

VALVE PACKAGE

LANDINGGEAR

SELECTORVALVE

CHECKVALVE

DOORSELECTOR

VALVE

GEAR UP-LOCK SWITCH

DOOR OPENSWITCH

NOSE

LEFT & RIGHT

GEAR UP-LOCK SWITCH

LEFT & RIGHT

DOOR CLOSESWITCH

LEFT & RIGHT

GEAR DOWN-LOCK SWITCH

LEFT GEARACTUATINGCYLINDER

LEFT GEARDOWNLOCK

RELEASECYLINDER

HORN CUTSWITCH

LANDAURAL

GEARUPLOCKRELEASECYLINDER

DOORCLOSELOCK

RELEASECYLINDER

MAIN LAN

LEFT DOORACTUATINGCYLINDER

SHUTTLEVALVE

EMERGENCY GEARDOWN HANDLE

GEAR DROP TOEXTEND POSITION

DOOR CLOSE SWITCH

LEGEND

ELECTRICAL CIRCUIT

CABLE LINE

DOOR OPEN SWITCH

S

LEFT & RIGHT

GEAR DOWN-LOCK SWITCH

GEAR SELECTORVALVE

NOSE GEARACTUATINGCYLINDER

DOWNLOCKRELEASECYLINDER

NOSE

DOOR SELECTORVALVE

DOOR SELECTORVALVE

CONTROLUNIT

(AIRPLANES RK-98AND RK-110 AND AFTER)

VENT LINE

PRESSURE LINE

RETURN LINE

NITROGEN

UPLOCKRELEASECYLINDER

SILENCE

GEARWARN

DOWN

RELLOCK

CABIN PRESS

LDG GR

DN

UP

CABIN DUMP

DOWNGEAR

EMER

R ENGOFF

L ENGBOTH NORM

BOTH HIGH

ON/OFFBLOWERVENT

LEFT AND RIGHTTHRUSTSWITCH

SWITCHGROUND SAFETY

LANDING GEAR

DUMPVALVE

VALVE PACKAGE

LANDINGGEAR

SELECTORVALVE

CHECKVALVE

DOORSELECTOR

VALVE

GEAR UP-LOCK SWITCH

DOOR OPENSWITCH

NOSE

LEFT & RIGHT

GEAR UP-LOCK SWITCH

LEFT & RIGHT

DOOR CLOSESWITCH

LEFT & RIGHT

GEAR DOWN-LOCK SWITCH

LEFT GEARACTUATINGCYLINDER

LEFT GEARDOWNLOCK

RELEASECYLINDER

HORN CUTSWITCH

LANDAURAL

GEARUPLOCKRELEASECYLINDER

DOORCLOSELOCK

RELEASECYLINDER

MAIN LAN

LEFT DOORACTUATINGCYLINDER

SHUTTLEVALVE

EMERGENCY GEARDOWN HANDLE

GEAR DROP TOEXTEND POSITION

DOOR CLOSE SWITCH

LEGEND

ELECTRICAL CIRCUIT

CABLE LINE

DOOR OPEN SWITCH

S

LEFT & RIGHT

GEAR DOWN-LOCK SWITCH

GEAR SELECTORVALVE

NOSE GEARACTUATINGCYLINDER

DOWNLOCKRELEASECYLINDER

NOSE

DOOR SELECTORVALVE

DOOR SELECTORVALVE

CONTROLUNIT

(AIRPLANES RK-98AND RK-110 AND AFTER)

VENT LINE

PRESSURE LINE

RETURN LINE

NITROGEN

Page 2: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

4I-2 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 3: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-3

Landing Gear and Brakes

NITROGENBOTTLE

CUIT

B4C

RH

-LG

002I

RIGHT GEARACTUATINGCYLINDER

RIGHT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

RH

DOORCLOSELOCK

RELEASECYLINDER

EMERGENCYDOOR CLOSE

EMERGENCYCONTROL

VALVEVENT

Beechjet 400A Developed for Training PurposesSeptember 2001

Normal Retraction

VENT LINE

LEGEND

PRESSURE LINE

RETURN LINE

NITROGEN

ELECTRICAL CIR

CABLE LINE

UPLOCKRELEASECYLINDER

DUMPVALVE

VALVE PACKAGE

DOORSELECTOR

VALVE

LEFT GEARACTUATINGCYLINDER

LEFT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

DOORCLOSELOCK

RELEASECYLINDER

MAIN LANDING GEARNOSE LANDING GEAR LH

LEFT DOORACTUATINGCYLINDER

SHUTTLE VALVE

EMERGENCY GEARDOWN HANDLE

GEAR DROP TOEXTEND POSITION

DOOR CLOSE SWITCH

DOOR OPEN SWITCH

RIGHT DOORACTUATINGCYLINDER

NOSE GEARACTUATINGCYLINDER

DOWNLOCKRELEASECYLINDER

CHECKVALVE

SHUTTLE VALVE

LANDINGGEAR

SELECTORVALVE

Page 4: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

4I-4 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 5: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-5

Landing Gear and Brakes

NITROGENBOTTLE

LINE

E

AL CIRCUIT

E

B4C

RH

-LG

003I

RIGHT GEARACTUATINGCYLINDER

RIGHT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

RH

DOORCLOSELOCK

RELEASECYLINDER

ORNGR

EMERGENCYDOOR CLOSE

EMERGENCYCONTROL

VALVEVENT

Beechjet 400A Developed for Training PurposesSeptember 2001

Normal Extension

VENT LINE

LEGEND

PRESSURE

RETURN LIN

NITROGEN

ELECTRIC

CABLE LIN

UPLOCKRELEASECYLINDER

DUMPVALVE

VALVE PACKAGE

DOORSELECTOR

VALVE

LEFT GEARACTUATINGCYLINDER

LEFT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

DOORCLOSELOCK

RELEASECYLINDER

MAIN LANDING GEARNOSE LANDING GEAR LH

LEFT DOORACTUATINGCYLINDER

SHUTTLE VALVE

EMERGENCY GEARDOWN HANDLE

GEAR DROP TOEXTEND POSITION

DOOR CLOSE SWITCH

DOOR OPEN SWITCH

RIGHT DOACTUATICYLINDE

NOSE GEARACTUATINGCYLINDER

DOWNLOCKRELEASECYLINDER

CHECKVALVE

SHUTTLE VALVE

LANDINGGEAR

SELECTORVALVE

Page 6: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

4I-6 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 7: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-7

Landing Gear and Brakes

NITROGENBOTTLE

LINE

N

ICAL CIRCUIT

LINE

B4C

RH

-LG

004I

RIGHT GEARACTUATINGCYLINDER

RIGHT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

RH

DOORCLOSELOCK

RELEASECYLINDER

EMERGENCYDOOR CLOSE

EMERGENCYCONTROL

VALVEVENT

Beechjet 400A Developed for Training PurposesSeptember 2001

Emergency Extension

LEGEND

RETURN

NITROGE

ELECTR

CABLE

UPLOCKRELEASECYLINDER

DUMPVALVE

VALVE PACKAGE

DOORSELECTOR

VALVE

LEFT GEARACTUATINGCYLINDER

LEFT GEARDOWNLOCK

RELEASECYLINDER

GEARUPLOCKRELEASECYLINDER

DOORCLOSELOCK

RELEASECYLINDER

MAIN LANDING GEARNOSE LANDING GEAR LH

LEFT DOORACTUATINGCYLINDER

SHUTTLE VALVE

EMERGENCY GEARDOWN HANDLE

GEAR DROP TOEXTEND POSITION

DOOR CLOSE SWITCH

DOOR OPEN SWITCH

RIGHT DOORACTUATINGCYLINDER

NOSE GEARACTUATINGCYLINDER

DOWNLOCKRELEASECYLINDER

SHUTTLE VALVE

LANDINGGEAR

SELECTORVALVE

Page 8: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

4I-8 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 9: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-9

Landing Gear and Brakes

LGKEBLY

EMERGENCYBRAKELEVER

EMERGENCY BRAKECONTROL VALVE

COPILOT'SRUDDERPEDALS

PSI

B4C

RH

-LG

005I

Beechjet 400A Developed for Training PurposesSeptember 2001

Brake System

RETURN

LEGEND

NITROGEN 1500

NITROGEN VENT

HYD PRESSURE 900

HYD PRESSURE 1500

CONTROLED PRESSURE

BRAKING PRESSURE

ANTISKIDFAIL

ANNUNCIATORPANEL

ANTI SKID SWITCH

CONTROL BOX

LEFT WHEEL SPEEDTRANSDUCER

LH MLGBRAKE

ASSEMBLY

RH MBRA

ASSEM

RIGHT WHEEL SPEEDTRANSDUCER

PARKING VALVES

VENT

BRAKE FLUIDRESERVOIR

PILOT'SMASTER

CYLINDERS

COPILOT'SMASTER

CYLINDERS

POWER BRAKEVALVE

CONTROLVALVE

ACCUMULATOR

HYDRAULICPACKAGE

PILOT'SRUDDERPEDALS

PARKING BRAKEHANDLE

MIXING VALVES

NITROGENBOTTLE

ANTI SKIDON

OFF

TEST

1 2 3 4

900 PSI± 50

1500PSI

1500 / 1650

Page 10: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-10 Developed for Training Purposes Beechjet 400ASeptember 2001

CAE SimuFlite

Page 11: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Beechjet 400A Developed for Training Purposes 4I-11September 2001

Landing Gear and Brakes

CHECKVALVE

VALVE PACKAGE

DOORSELECTOR

VALVE

THRUSTLEVER

SHUTTLEVALVE

EMERGENCYDOOR

CLOSE

EMERGENCYLEFT/RIGHTDOWN

GEAR UPLOCKRELEASE

RH GEARACTUATOR

RHDOORACTU-ATOR

LHDOORACTU-ATOR

GEAR UPLOCKRELEASE

LH GEARACTUATOR

NOSEGEARACTUATOR

UPLOCK

DOWNLOCK

DUMPVALVEGEAR

SELECTORVALVE

VENT

B4TM-LG001i

VENT LINE

LEGEND

PRESSURE LINE

RETURN LINE

NITROGEN

Landing Gear Control System Flow Diagram

Page 12: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

4I-12 Developed for Training Purposes Beechjet 400ASeptember 2001

CAE SimuFlite

Page 13: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Landing Gear and Brakes

Landing Gear and Brake SystemThe landing gear is electrically controlled, hydraulically actu-ated and is enclosed by mechanically and hydraulically actu-ated doors. Gear position and warning are provided byindicator lights and a warning horn.

Nosewheel steering is mechanically actuated by the rudderpedals to provide directional control on the ground. A separate,self-contained shimmy damper prevents nosewheel shimmy.

The power brakes are master cylinder controlled, featuringelectrical antiskid protection.

Each inboard-retracting main gear utilizes five hydraulic actua-tors: one to extend and retract the gear, one for inboard dooractuation and one each for gear uplock/downlock/inboard doorrelease. The forward-retracting nose gear requires threehydraulic actuators: one to extend and retract the gear and onefor each gear uplock/downlock release.

Gear position indication is provided by colored lights on thelanding gear control panel. In addition, a warning horn sounds ifany gear is not down and locked when flap settings are in thelanding configuration.

The nosewheel steering system, capable of steering 25degrees either side of center, is mechanically actuated by rud-der pedal deflection and can be castered to 45 degrees by useof asymmetric brake application and thrust. The system is dis-engaged when the gear is retracted. Vibration feedback is pre-vented by a steering damper and nosewheel shimmy isprevented by a separate shimmy damper.

The power brakes are controlled by pressure from toe-operatedmaster cylinders. Antiskid, when selected, provides maximumbraking capability without skid under all runway conditions.

Beechjet 400A Developed for Training Purposes 4I-13September 2001

Page 14: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

Landing Gear SystemThe airplane is equipped with hydraulically-actuated, retract-able, tricycle landing gear. Each gear is actuated by its own pis-ton-type actuator. Each fuselage MLG door is operated by itsown piston-type actuator. The MLG and NLG doors aremechanically linked to the main landing gear and the noselanding gear. The ground safety switch on the torque link ofeach main landing gear prevents accidental retraction of thelanding gear when the airplane is on the ground. The landinggear control handle on the landing gear control unit controlsgear retraction and extension.

Control UnitThe landing gear control unit has a manually operated handlethat electrically controls the position of the landing gear. Themanually operated handle operates four limit switches which,according to the selected position of the handle, apply 28V DCpower to the UP or DOWN solenoid of the hydraulic valvepackage through the gear position-limit switch circuit. The man-ually operated handle has a locking mechanism in the DOWNposition to prevent accidental movement of the handle. Whenthe airplane is on the ground and electrical power is ON, a sole-noid is de-energized to lock the handle in the DOWN position.In flight, when the solenoid is energized through the landinggear safety (squat) switch, the landing gear control handledownlock is released. The LH landing gear safety (squat)switch keeps the landing gear control unit handle from movingout of the DOWN position when the airplane is on the ground. Ifthe switch fails to close, the landing gear control unit handlecannot be moved toward the UP position in flight. On airplanesRK-1 thru RK-109, except RK-98, an override switch locatedabove the landing gear control handle is provided to releasethe downlocked handle. On airplanes RK-98 and RK-110 andafter, the override switch is located beside the landing gearcontrol handle on the copilot’s instrument panel.

4I-14 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 15: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Landing Gear and Brakes

Landing Gear RetractionWhen the main landing gear is down and locked, the fuselageMLG doors are closed and locked. In the gear extended config-uration, three green lights on the control unit are illuminated toindicate a down and locked condition, the red warning light isextinguished and the aural warning is silent. When the weightof the airplane is off the landing gear, the gear struts are fullyextended and the landing gear control handle can be moved tothe UP position. Moving the handle up electrically positions thegear door selector valve so as to direct hydraulic pressure tothe fuselage MLG door lock release cylinders and the dooractuating cylinders. The door locks release and the doorsopen, actuating the door open switches. When both door openswitches are actuated, the gear selector valve is electricallypositioned to direct hydraulic pressure to the gear downlockrelease cylinders and to the retract side port of the main andnose actuating cylinders. As the landing gear retracts into thewheel wells, each gear strut uplock roller rotates the uplockhook past center; all the uplock assemblies will be mechani-cally moved to the locked posit ion. When all uplock switchesare actuated, the gear door selector will be positioned to theclosed position and pressure will be directed to close the fuse-lage MLG doors.

At the same time, the landing gear retract solenoid is de-ener-gized and hydraulic pressure is removed from the gear actua-tor. When the fuselage MLG doors are closed and locked,hydraulic pressure is removed from the door actuators. Aseach gear unlocks from the downlocked position, its respectivegreen indicator light extinguishes. When all gear and doors areup and locked, the red warning light will extinguish. The retrac-tion cycle will be completed in approximately 7 seconds.

Beechjet 400A Developed for Training Purposes 4I-15September 2001

Page 16: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

Landing Gear ExtensionMoving the landing gear control handle down electrically posi-tions the gear door selector valve to direct pressure to the fuse-lage MLG door lock release cylinder and to the door actuatingcylinders. As each door reaches the full open position, it actu-ates the door open switch. When both door open switches areactuated, the landing gear selector valve is electrically posi-tioned to direct hydraulic pressure to the gear uplock releasecylinders and to the extend port of the MLG and NLG actuators.The gear uplocks open and the gear extends. Movement of thegear into the downlocked position actuates downlock switchesthat electrically position the gear door selector valve to directpressure to the door actuators. These switches de-energize thelanding gear selector valve solenoid to shut off pressure to thegear actuators. When the gear doors are closed and locked,hydraulic pressure to the door-actuating cylinder is shut off.Upon initial opening of the fuselage MLG doors, the red warn-ing light will illuminate. As each gear downlock switch is actu-ated, its respective green indicator light will illuminate andwhen the fuselage MLG doors close, the red warning light willextinguish. The landing gear extension cycle will be completedin approximately 7 seconds. The NLG door is moved bymechanical linkage connected to the nose landing gear strut.

Nose gear movement controls the doors during its operatingcycle. The nose gear doors cover the wheel well when the gearis retracted and only the forward part of the wheel well whenthe gear is extended. The door covering the aft part of thewheel well is linked directly to the gear strut and opens andcloses as the gear moves. It remains open when the gear isextended. The two doors, which cover the forward part of thewheel well, are linked to a torque tube and then to the nosegear trunnion. During nose gear extension and retraction, thefirst half of trunnion travel opens the doors and the last halfcloses the doors.

4I-16 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 17: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Landing Gear and Brakes

Emergency ExtensionThe EMER L/G DOWN handle and the EMER DOOR CLOSEhandle are installed under the pilot's instrument panel. Pullingthe EMER L/G DOWN handle all the way out (approximately 10inches), releases the fuselage MLG door uplocks, MLGuplocks, and NLG uplock. The gear doors open and the landinggear free falls to the down-and-locked position, assisted byextension springs on each landing gear downlock. At the initialopening motion of the doors, the red warning light will illumi-nate. As the landing gear extends to the down-and-locked posi-tion, their respective green indicator lights will illuminate. Afterthe three green indicator lights illuminate, the EMER L/GDOWN handle is pushed to the stowed position and the EMERDOOR CLOSE handle is operated to close the fuselage MLGdoors by nitrogen pressure. After the doors are closed, the redwarning light will extinguish. The nitrogen pressure is suppliedfrom a nitrogen bottle mounted in the left nose electroniccompartment.

Position and Warning SystemThe landing gear position and warning system provides visualand aural indications of landing gear position. Three green indi-cator lights are located adjacent to the landing gear handle. Ared gear unsafe warning light is located either above the greenindication lights (airplanes RK-1 thru RJK-109, except RK-98)or in the knob of the landing gear handle for airplanes RK-98and RK-110 and after. Each green light corresponds to onegear (NOSE, L and R) and indicates that it is in the down-and-locked position. The red warning light indicates an unsafe gearposition (in transit or not locked) or an open gear door. Thelanding gear aural warning is provided to generate a warningwhen any landing gear is not down-and-locked and one or boththrust levers are retarded to a low power setting. The HORN

NOTE: This bottle also provides nitrogen pressure for emergency braking.

Beechjet 400A Developed for Training Purposes 4I-17September 2001

Page 18: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

CUT switch located on each control wheel or the GEARWARNING SILENCE button on the copilot’s left sub-panelsilences the warning. The warning system is reset when thethrust lever is advanced.

Land Sel SwitchWhen the LAND SEL switch on the center pedestal is selectedto FLAPS 10° and the flaps are extended to 10 degrees withany gear not down-and-locked, the aural warning will soundand cannot be cancelled.

When the LAND SEL switch is placed to FLAPS 30° and theflaps are extended beyond 20 degrees with any gear not down-and-locked, the aural warning will sound regardless of thethrust lever position. In this condition, the aural warning cannotbe cancelled.

SteeringThe nosewheel steering system is controlled through the rud-der pedal. When the nose gear is extended, a slotted cam ismoved into posit ion and rotates the nose gear strut. The maxi-mum available steering angle is 45 degrees left or right. Rudderpedal mechanical linkage steering angle is 25 degrees left orright with an additional 20 degrees obtained through the use ofdifferential braking and asymmetrical thrust. A steering discon-nect pin in the torque link permits free rotation of the nosewheelfor towing purposes. When the nose gear is retracted, thesteering mechanism is separated mechanically at the slottedcam and the gear is held in the neutral position.

4I-18 Developed for Training Purposes Beechjet 400ASeptember 2001

Page 19: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Landing Gear and Brakes

Wheel Brake SystemThe main landing gear wheels are equipped with full poweredbrakes operated by toe action on the rudder pedals. An antiskidsystem is incorporated in the power brake system. Emergencybraking is accomplished through the nitrogen brake system.The emergency brake control lever is installed on the upperright side of the pedestal.

Power Brake SystemWhen the pilot or copilot depresses the brake pedals, the deliv-ery pressure of the master cylinder (directly connected to thebrake pedals) is transferred to the power brake valve throughthe mixing valves. The power brake valve amplifies the mastercylinder pressure and transfers the increase of pressure to theMLG brakes.

Antiskid SystemThe airplane is equipped with an electrically controlled antiskidsystem. The system detects the start of a skid condition at thewheels and automatically releases the brake pressure for bothwheels in proportion to the severity of the skid. Use of the anti-skid system offers protection from skids and can provide con-sistently shorter landing rolls for all runway conditions. Placingthe ANTI SKID switch in the ON position activates the system.A stationary wheel speed transducer, mounted inside eachmain gear axle, electrically senses any change in wheel rota-tion speed. As a skid is detected, an electrical signal is suppliedto the system, which releases hydraulic pressure from thebrakes. With brake pressure released, the wheel speed willincrease and hydraulic pressure will be restored to the brakes.The antiskid system continues this control cycling as long as

NOTE: The power brake system can be used with or with-out the antiskid system.

Beechjet 400A Developed for Training Purposes 4I-19September 2001

Page 20: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

braking pressure is sufficient to cause the skidding condition.Antiskid protection is not available below 10 to 14 knots.

Selecting the OFF position on the ANTI SKID switch, locatedon the center pedestal, will restore the system to the powerbrake mode after a two to three second delay.

If immediate braking action is required, follow the Power BrakeFailure Procedures in the EMERGENCY PROCEDURES Sec-tion of the AFM Approved Airplane Flight Manual.

CAUTION: Do not land with brake pedals depressed.

Antiskid Control SwitchThis three-position toggle switch is located on the center ped-estal. When the ANTI- SKID switch is ON, power is supplied tothe system. Placing the ANTI SKID switch to OFF will turn offthe antiskid system. To test the system, apply brakes while theairplane is in motion and note that the brakes release when theANTI SKID switch is placed to TEST. If the ANTI SKID switch isplaced to ON immediately after the test, normal braking is notavailable for 3 to 4 seconds. Normal braking is available withthe ANTI SKID switch OFF.

NOTE: In the event air squat switch logic is not removed from the control box after landing, spin-up override will per-mit antiskid protected braking down to approximately 37-47 knots. At approximately 37-47 knots a total brake release (hard pedal with no braking action) will be experienced. The ANTISKID FAIL annunciator will not be illuminated.

4I-20 Developed for Training Purposes Beechjet 400AMarch 2002

Page 21: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

Landing Gear and Brakes

Antiskid Fail AnnunciatorThe ANTISKID FAIL annunciator illuminates if a malfunctionexists in the system when the gear is extended and the ANTISKID switch is ON. The annunciator will also illuminate whenthe ANTI SKID switch is turned OFF.

Parking BrakeThe parking brake is a part of the normal brake system andemploys check valves that prevent the return of fluid after thebrake pedals have been released. Parking brakes are set bypulling out the PARKING BRAKE HANDLE, located under thelower left side of the instrument panel, and depressing the toebrakes two or three times. Do not set the parking brake with thecopilot 's pedals if the engines are not running. Without powerboost (i.e. engines not running) the copilot's pedals require sev-eral pumps to set brakes. This may cause the f irst or secondsubsequent application of brakes from the pilot's pedals to beineffective. The parking brake is released by pushing in thehandle.

The parking brake should not be set if the brakes are very hot.This increases brake cool-down time due to decreased airflow.This may result in sufficient heat transfer from the brakes tocause the parking brake hydraulic pressure to rise excessively,or to melt the thermal relief plugs in the wheel.

NOTE: When the ANTISKID FAIL annunciator illuminates, the system is in a fail-safe condition and complete control of braking, through the normal braking system, is available.

Beechjet 400A Developed for Training Purposes 4I-21September 2001

Page 22: Landing Gear System Landing Gear and Brakes - MrMoo.net 400A/13 gear brakes.pdf · NOSE LANDING GEAR MAIN LANDING GEAR LH RH DOOR CLOSELOCK RELEASE CYLINDER LEFT DOOR ACTUATING CYLINDER

CAE SimuFlite

Emergency BrakeIn the event of normal hydraulic brake system failure, the pilotor copilot can continue braking operation by using the spring-loaded emergency brake lever mounted on the upper right sideof the pedestal. The nitrogen bottle, mounted in the lower por-tion of the left electronics bay in the nose, contains sufficientpressure for 7 to 10 full brake applications when fully charged.

For the most efficient use of the system, use steady andsmooth application, gradually increasing force until desiredbraking action is attained. Maintain that pressure until the air-plane is stopped. When the lever is released, residual nitrogenpressure from the brakes is vented overboard. Normal brakingshould not be applied while using the emergency brakes.

NOTE: This bottle also provides pressure to close the MLG doors during emergency extension.

4I-22 Developed for Training Purposes Beechjet 400ASeptember 2001