Boeing 737NG – Landing Gear - SmartCockpit - Airline training guides, Aviation, Operations, Safety

While the landing gear is being extended manually, the landing gear lever must be selected to:

OFF and then selected to DOWN after extension.

DOWN and remain DOWN after extension.

OFF and remain OFF after extension.

Correct! Wrong!

With Flap 25 selected and the gear not down and locked, both Forward Thrust Levers are retarded to below approximately 10 degrees thrust lever angle. The gear warning horn sounds and:

Can be cancelled by the Landing Gear Horn Cut-Out switch.

Can be cancelled by moving one of the Thrust levers forward to approximately the 30 degrees thrust lever angle.

Cannot be cancelled by the Landing Gear Horn Cut-Out switch or by any position of the thrust levers.

Correct! Wrong!

The alternate anti-skid system has:

Four anti-skid valves.

Two anti-skid valves.

One alternate brake metering valve connected to all alternate antiskid valves.

Correct! Wrong!

The air-ground system receives air-ground logic signals from:

Six sensors, two on each landing gear

The cabin pressure controller

The altimeter

The FMC position updating from the GPS

Correct! Wrong!

In flight and ground operation of various airplane systems are controlled by the air/ground system. These signals are used to configure the airplane systems to the appropriate air or ground status.

What is the minimum preflight pressure for the brake accumulator?

2800 psi.

2500 psi.

3000 psi.

3500 psi.

Correct! Wrong!

The alternate brake source selector valve:

Isolates accumulator pressure.

Prevents hydraulic system A from powering the alternate brake system when hydraulic system B is operating normally.

Prevents hydraulic system B from powering the alternate brake system when hydraulic system A is operating normally.

Correct! Wrong!

If a landing is made with RTO selected:

AUTO BRAKE DISARM light illuminates 3 seconds after touchdown

AUTO BRAKE DISARM light illuminates 2 seconds after touchdown and no automatic braking action occurs.

Automatic braking action occurs at the RTO level

Automatic braking occurs at the MAX level

Correct! Wrong!

The parking brake can be set with only B hydraulic system pressurized.

True

False

Correct! Wrong!

The parking brake can be set with either A or B hydraulic systems pressurized. If A and B hydraulic systems are not pressurized, parking brake pressure is maintained by the brake accumulator. Accumulator pressure is shown on the HYD BRAKE PRESS indicator.

The brake accumulator is pressurized by hydraulic system A. If both normal and alternate brake system pressure is lost, trapped hydraulic pressure in the brake accumulator can still provide several braking applications or parking brake application.

True.

False.

Correct! Wrong!

The brake accumulator is pressurized by hydraulic system B.

Hydraulic system pressure from System B will be used to retract the landing gear:

When System A pressure is low and the landing lever is positioned UP.

After a failure of the No.1 engine hydraulic pump with the landing gear still down and the landing gear lever is positioned UP.

After failure of the No.1 engine with the landing gear still down and the landing gear lever is positioned up.

When the ALTERNATE NOSE WHEEL switch is positioned ON.

Correct! Wrong!

With RTO selected, if the takeoff is rejected prior to wheel speed reaching _____ autobraking is not initiated, the AUTO BRAKE DISARM light does not illuminate and the RTO autobrake function remains armed.

90 knots

72 knots

60 knots

80 knots

Correct! Wrong!

If the takeoff is rejected after reaching a wheel speed of 90 knots, maximum braking is applied automatically when the forward thrust levers are retarded to IDLE.

After landing, autobrake application begins when both forward thrust levers are retarded to IDLE and Nose wheel and main wheels spin up.

True.

False.

Correct! Wrong!

The Nose wheel has no input.

What airspeed must be considered with a wheel well fire situation?

Retract landing gear speed of 245 knots maximum.

Observe extend limit speed (270 knots and .82M).

Observe extend limit speed (280 KIAS and .72M).

Maintain 235 knots maximum for 20 minutes.

Correct! Wrong!

If a landing is made with RTO selected:

AUTO BRAKE DISARM light illuminates 3 seconds after touchdown

Automatic braking occurs at the MAX level

Automatic braking action occurs at the RTO level

AUTO BRAKE DISARM light illuminates 2 seconds after touchdown and no automatic braking action occurs.

Correct! Wrong!

What could cause the amber ANTISKID INOP light to illuminate?

A system fault has been detected by the antiskid monitoring system.

System B pressure is low.

Brake accumulator pressure is in the red band.

AUTO BRAKE select switch OFF.

Correct! Wrong!

The brake pressure accumulator also provides pressure to maintain the parking brake when hydraulic system A and B are depressurized.

False.

True.

Correct! Wrong!

When the manual extension access door is open:

Normal landing gear extension is still possible if hydraulic system A pressure is available

Manual landing gear extension is possible with landing gear lever in any position.

Normal landing gear extension is still possible if hydraulic system B pressure is available

Landing gear retraction is enabled.

Correct! Wrong!

The landing gear indicator lights found on the center panel will illuminate red when:

There are no red lights.

One of the 6 green lights is inoperative..

All landing gear are UP and the gear handle is in OFF position

All landing gear are DN and the gear handle is in OFF position

Correct! Wrong!

The nose wheel doors go from the open to the close position when the gear is down.

True.

False.

Correct! Wrong!

The nose wheel doors remain open when the gear is down.

The parking brake is released by depressing the pedals until the PARKING BRAKE lever releases. A fault in the parking brake system may cause the ANTISKID INOP light to illuminate.

False.

True.

Correct! Wrong!

The autobrake system performs a self-test at initial AC power application. If the self test is not successful, the AUTO BRAKE DISARM light illuminates and the system does not work.

True.

False.

Correct! Wrong!

Fittings located in the opening of each main gear well:

Provide positive unlock during main gear retraction

Allows the landing gear transfer unit to use hydraulic system B pressure to raise the gear if hydraulic system A fails.

Are intended to provide protection to wheel well components during gear retraction by preventing a gear with a spinning tire and loose tread from entering the wheel well

Are intended to provide automatic braking to main gear wheels during retraction

Correct! Wrong!

If the landing gear cannot be raised after takeoff:

Use the override trigger.

Pull the landing gear lever out to the second detent then raise it to the up position.

Land at the nearest suitable airfield.

When at a safe altitude follow the QRH procedure.

Correct! Wrong!

During taxi before takeoff, the amber AUTO BRAKE DISARM light illuminates. What should you do?

Position the AUTO BRAKE select switch to OFF and then reselect RTO. If light re-illuminates, use manual brakes in case of RTO.

Position the AUTO BRAKE select switch to OFF. Do not attempt takeoff if light remains illuminated.

Position ANTISKID select switch to OFF. Use manual brakes in case of RTO.

AUTO BRAKE system is not mandatory. There is no limitation.

Correct! Wrong!

When the NOSE WHEEL STEERING switch is in ALT position:

Hydraulic system A provides power for nose wheel steering.

Standby hydraulic system provides power for nose wheel steering.

Hydraulic system B provides power for nose wheel steering.

The nose wheel steering tiller changes sensitivity for precision parking

Correct! Wrong!

The accumulator isolation valve is closed by:

System A pressure whenever system B pressure is lost.

System B pressure whenever system A pressure is lost.

Brake accumulator pressure whenever system B is lost.

Correct! Wrong!

What is the steering authority for the rudder pedals?

+ or - 20 degrees

+ or - 13 degrees

+ or - 7 degrees

+ or - 5 degrees

Correct! Wrong!

Hydraulic pressure from System B will be used to raise the landing gear:

After a failure of the No.1 engine hydraulic pump with the landing gear still down and the landing gear is positioned up.

When the ALTERNATE NOSE WHEEL Switch is positioned ON.

When the No.1 engine RPM drops below a limit value with the landing gear still down and the landing gear is positioned up.

When System A pressure is low and the landing lever is positioned up.

Correct! Wrong!

During alternate brake system operation, the following protection is provided:

Skid and locked wheel.

Skid and hydroplane only.

Skid, locked wheel and hydroplane only.

Skid, locked wheel, touchdown and hydroplane.

Correct! Wrong!

Both normal and alternate brake systems provide skid, locked wheel, touchdown and hydroplane protection.

Landing autobrake settings may be selected after touchdown prior to decelerating through _____. Braking initiates immediately if both forward thrust levers are retarded to IDLE and the main wheels spin–up.

40 knots IAS.

30 kts of ground speed.

30 knots.

40 kts of ground speed.

Correct! Wrong!

If the thrust levers are advanced after touchdown:

The AUTO BRAKE DISARM light will illuminate immediately.

The AUTO BRAKE DISARM light will illuminate after 3 seconds.

The AUTO BRAKE DISARM light will not illuminate.

The AUTO BRAKE select switch will move to OFF.

Correct! Wrong!

The precharge pressure in the brake accumulator is:

1700 psi.

1000 psi.

1500 psi.

Correct! Wrong!

The HYD Brake Pressure indicator reads zero, but both hydraulic system pressures are normal.

The nitrogen precharge in the brake accumulator has leaked out, accumulator braking is not available but normal braking is unaffected.

The nitrogen precharge in the brake accumulator has leaked out, normal braking is not available but alternate braking is unaffected.

The nitrogen precharge in the brake accumulator has leaked out and alternate brakes will not be available in the event of system B failure.

Correct! Wrong!

What is the maximum airspeed to retract the gear?

235 kt.

250 kt.

210 kt.

270 kt.

Correct! Wrong!

Which of the following is not part of the braking system?

Nose wheel brakes

Antiskid protection.

Brake accumulator.

Parking brake.

Correct! Wrong!

What system normally provides hydraulic pressure for Nose Wheel Steering?

System B

System A

Nose wheel steering accumulator

Standby system

Correct! Wrong!

What is the maximum Operating airspeed with the gear extended?

235 kt and .80M.

235 kt and .78M.

270 kt and .82M.

270 kt and .80M.

Correct! Wrong!

Is autobrake available with alternate brakes?

Yes for takeoff only.

Yes for landing only.

No.

Yes for takeoff and landing.

Correct! Wrong!

If the nose gear lockout pin is not installed

Pushback must be with both System A hydraulic pumps OFF.

Pushback must be with both System A hydraulic pumps ON.

Pushback must be with System A Elec. pump OFF.

Correct! Wrong!

The alternate brake system is powered by:

Accumulator pressure.

System B hydraulics.

System A hydraulics.

Correct! Wrong!

Hydraulic pressure is removed from the landing gear system after 5 minutes with the LANDING GEAR lever in the OFF position.

False.

True.

Correct! Wrong!

There is no countdown. The hydraulic pressure is removed immediately with the LANDING GEAR lever in the OFF position.

What happens if you reject a takeoff after reaching 90 knots with the autobrakes in RTO?

Automatic braking when reverse thrust selected

AUTO BRAKE DISARM light will illuminate

Maximum braking when thrust levers are retarded to idle

Automatic speed brake deployment when thrust levers are retarded to idle

Correct! Wrong!

Which statement is true?

Rudder pedal steering overrides the steering wheel inputs.

Rudder pedal steering is deactivated as the nose gear strut extends.

Hydraulic system B pressure is bypassed with the lock out pin installed in the steering depressurization valve.

Rudder pedal steering allows 37 degrees of steering in either direction.

Correct! Wrong!

Which pressure is indicated by the Hydraulic Brake Pressure Indicator?

Maximum pressure of 3500 PSI

Normal pressure of 3500 PSI

Normal precharge in the brake accumulator of 1200 PSI.

Normal precharge of 2800 PSI

Correct! Wrong!

During landing gear retraction:

A fitting in the wheel well opening applies a braking force to the wheels.

The pilot applies manual brakes to stop main gear rotation.

Snubbers in the wheel bays stop the rotation of all wheels.

The brakes automatically stop rotation of the main gear wheels.

Correct! Wrong!

Landing autobrake settings may be selected after touchdown:

Prior to decelerating through through 60 knots groundspeed

However, the AUTO BRAKE DISARM light will illuminate and autobrake application will not occur

However, autobrake action will occur only when both thrust levers are retarded to reverse thrust range

Prior to decelerating through 30 kts of ground speed.

Correct! Wrong!

If a main landing gear tire is damaged during takeoff, it is possible that braking of the main gear wheels during retraction may be affected. A spinning tire with a loose tread must be stopped prior to entering the wheel well or it can cause damage to wheel well components. When a spinning tire with loose tread impacts a fitting in the wheel well ring opening, that gear stops retracting and free falls back to the down position.

True.

False.

Correct! Wrong!

Hydraulic pressure is removed from the landing gear system with the LANDING GEAR lever in the UP position.

True.

False

Correct! Wrong!

The hydraulic pressure is removed with the LANDING GEAR lever in the OFF position!

Landing Gear Indicator Lights - What does this indication mean?

Landing gear is not down and locked (with either or both forward thrust levers retarded to idle, and below 800 feet AGL). Related landing gear is in disagreement with LANDING GEAR lever position (in transit or unsafe).

Landing gear is not down and locked (with either or both forward thrust levers retarded to idle, and below 1000 feet AGL). Related landing gear is in disagreement with LANDING GEAR lever position.

Landing gear is not down and locked. Related landing gear is in disagreement with LANDING GEAR lever position (in transit or unsafe).

Landing gear is not down and locked (with thrust levers in idle, and below 800 feet AGL). Related landing gear is in disagreement with LANDING GEAR lever.

Correct! Wrong!

Antiskid protection is available even with loss of both hydraulic systems.

False.

True.

Correct! Wrong!

Antiskid system protection is provided during autobrake operation.

Positioning the landing gear control lever to down makes system A hydraulic pressure available to the steering metering valve. Alternate nose wheel steering can be activated to provide system B pressure to the nose wheels when the NOSE WHEEL STEERING switch is placed to ALT, normal quantity is in the system B reservoir, and the airplane is on the ground.

True.

False.

Correct! Wrong!

Boeing 737NG – Landing Gear