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

What system normally provides hydraulic pressure for Nose Wheel Steering?

Nose wheel steering accumulator

System A

Standby system

System B

Correct! Wrong!

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

Six sensors, two on each landing gear

The altimeter

The cabin pressure controller

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.

During landing gear retraction:

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

The brakes automatically stop rotation of the main gear wheels.

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

The pilot applies manual brakes to stop main gear rotation.

Correct! Wrong!

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

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

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

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

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

Correct! Wrong!

If a landing is made with RTO selected:

Automatic braking occurs at the MAX level

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

AUTO BRAKE DISARM light illuminates 3 seconds after touchdown

Automatic braking action occurs at the RTO level

Correct! Wrong!

What is the maximum Operating airspeed with the gear extended?

270 kt and .82M.

235 kt and .78M.

235 kt and .80M.

270 kt and .80M.

Correct! Wrong!

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!

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.

What is the maximum airspeed to retract the gear?

270 kt.

210 kt.

235 kt.

250 kt.

Correct! Wrong!

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

When the ALTERNATE NOSE WHEEL Switch is positioned ON.

After a failure of the No.1 engine hydraulic pump 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.

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

Correct! Wrong!

Fittings located in the opening of each main gear well:

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

Provide positive unlock during main gear retraction

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

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

Correct! Wrong!

Landing autobrake settings may be selected after touchdown:

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

Prior to decelerating through 30 kts of ground speed.

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

Prior to decelerating through through 60 knots groundspeed

Correct! Wrong!

If a landing is made with RTO selected:

Automatic braking action occurs at the RTO level

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

Automatic braking occurs at the MAX level

AUTO BRAKE DISARM light illuminates 3 seconds after touchdown

Correct! Wrong!

The alternate brake system is powered by:

System A hydraulics.

System B hydraulics.

Accumulator pressure.

Correct! Wrong!

What could cause the amber ANTISKID INOP light to illuminate?

Brake accumulator pressure is in the red band.

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

System B pressure is low.

AUTO BRAKE select switch OFF.

Correct! Wrong!

Which pressure is indicated by the Hydraulic Brake Pressure Indicator?

Normal pressure of 3500 PSI

Maximum pressure of 3500 PSI

Normal precharge of 2800 PSI

Normal precharge in the brake accumulator of 1200 PSI.

Correct! Wrong!

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!

What is the minimum preflight pressure for the brake accumulator?

2800 psi.

3500 psi.

2500 psi.

3000 psi.

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!

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.

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

False.

True.

Correct! Wrong!

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.

False.

True.

Correct! Wrong!

The brake accumulator is pressurized by hydraulic system B.

The precharge pressure in the brake accumulator is:

1000 psi.

1500 psi.

1700 psi.

Correct! Wrong!

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

Skid, locked wheel and hydroplane only.

Skid, locked wheel, touchdown and hydroplane.

Skid and locked wheel.

Skid and hydroplane only.

Correct! Wrong!

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

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

When the ALTERNATE NOSE WHEEL switch is positioned ON.

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

When System A pressure is low and the landing 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.

Correct! Wrong!

When the NOSE WHEEL STEERING switch is in ALT position:

Hydraulic system A provides power for nose wheel steering.

The nose wheel steering tiller changes sensitivity for precision parking

Standby hydraulic system provides power for nose wheel steering.

Hydraulic system B provides power for nose wheel steering.

Correct! Wrong!

What is the steering authority for the rudder pedals?

+ or - 13 degrees

+ or - 20 degrees

+ or - 7 degrees

+ or - 5 degrees

Correct! Wrong!

If the nose gear lockout pin is not installed

Pushback must be with System A Elec. pump OFF.

Pushback must be with both System A hydraulic pumps OFF.

Pushback must be with both System A hydraulic pumps ON.

Correct! Wrong!

The accumulator isolation valve is closed by:

System A pressure whenever system B pressure is lost.

Brake accumulator pressure whenever system B is lost.

System B pressure whenever system A pressure is lost.

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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 moving one of the Thrust levers forward to approximately the 30 degrees thrust lever angle.

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

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

Correct! Wrong!

Landing Gear Indicator Lights - What does this indication mean?

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.

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.

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 and alternate brakes will not be available in the event of system B failure.

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

Correct! Wrong!

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.

30 knots.

30 kts of ground speed.

40 kts of ground speed.

40 knots IAS.

Correct! Wrong!

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

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

There are no red lights.

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

One of the 6 green lights is inoperative..

Correct! Wrong!

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

AUTO BRAKE DISARM light will illuminate

Maximum braking when thrust levers are retarded to idle

Automatic braking when reverse thrust selected

Automatic speed brake deployment when thrust levers are retarded to idle

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!

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

DOWN and remain DOWN after extension.

OFF and then selected to DOWN after extension.

OFF and remain OFF after extension.

Correct! Wrong!

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

Maintain 235 knots maximum for 20 minutes.

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

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

Retract landing gear speed of 245 knots maximum.

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 the thrust levers are advanced after touchdown:

The AUTO BRAKE DISARM light will not illuminate.

The AUTO BRAKE DISARM light will illuminate immediately.

The AUTO BRAKE DISARM light will illuminate after 3 seconds.

The AUTO BRAKE select switch will move to OFF.

Correct! Wrong!

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

False

True.

Correct! Wrong!

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

Which statement is true?

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

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

Rudder pedal steering overrides the steering wheel inputs.

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

Correct! Wrong!

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

False.

True.

Correct! Wrong!

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

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.

If the landing gear cannot be raised after takeoff:

When at a safe altitude follow the QRH procedure.

Use the override trigger.

Land at the nearest suitable airfield.

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

Correct! Wrong!

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

False

True

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 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!

The alternate anti-skid system has:

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

Four anti-skid valves.

Two anti-skid valves.

Correct! Wrong!

Is autobrake available with alternate brakes?

No.

Yes for landing only.

Yes for takeoff and landing.

Yes for takeoff only.

Correct! Wrong!

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

Antiskid protection.

Brake accumulator.

Nose wheel brakes

Parking brake.

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.

Boeing 737NG – Landing Gear