Landing Gear

Question 1

Which hydraulic systems must be powered when checking the brake wear indicators?

Answer 1

System 2 and 3 and the brakes must be applied

Question 2

Which hydraulic system powers the landing gear?

Answer 2

System 3.

Question 3

Which hydraulic systems can be used to assist manual landing gear extension if the main system fails?

Answer 3

System 2.

Question 4

What effect will the loss of both the #2 and #3 hydraulic system have on the landing gear?

Answer 4

You will not be able to lower the nosegear—no pressure available to force it off the uplock.

Question 5

In the event of a #2 and #3 hydraulic system failure, what emergency braking is available?

Answer 5

Brake accumulators in both systems should provide reserve pressure for six applications with the anti skid OFF.

Question 6

How is the Anti-Skid test performed?

Answer 6

The Anti-Skid Control Unit is equipped with a self test feature. It is also tested during the originating check by cycling the Anti-Skid switch.

Question 7

What should you do if you are unable to raise the gear handle after takeoff?

Answer 7

Use the DN LCK REL button next to the gear handle to release the downlock mechanism

Question 8

What effect will the loss of either the #2 or #3 hydraulic system have on braking capability?

Answer 8

Anti-skid braking will be available from the remaining system, with a 50% loss of stopping capability.

Question 9

Locked wheel protection is provided by the anti-skid system upon landing. When will the system allow braking to occur?

Answer 9

Wheel spin up speed reaches 35 kts or 5 seconds after WOW signal is present.

Question 10

When the parking brake is set and hydraulic systems are deactivated, what effect does it have?

Answer 10

Pressure will bleed off in the #2 system but will be maintained from the #3 system brake accumulators because of a parking brake shutoff valve.

Question 11

After an overheated brake is cooled in flight by lowering the gear, how can the pilot reset the BTMS indicating system?

Answer 11

Press the BTMS OVHT WARN RESET button on the landing gear panel.

Question 12

With the same indications of an overheated brake on the ground, what should you do?

Answer 12

Do not reset the BTMS system until maintenance has had a chance to inspect the brake.

Question 13

The nosewheel steering system allows travel of _______ from neutral with the rudder pedals and ______ with the handwheel control unit.

Answer 13

8 degrees/80 degrees

Question 14

With a failure of the nosewheel steering system, the nosewheel will go into the ____________.

Answer 14

Free castering mode

Question 15

Bumping or moving the nosewheel tiller after landing gear extension will interfere with a system test and cause the nosewheel steering to be: ____________.

Answer 15

Inoperative upon landing, with no advance warning to the pilot in flight

Question 16

How does the parking brake work?

Answer 16

The parking brake shutoff valve is used to lock the brakes on by trapping hydraulic system 3 pressure. When the hydraulic system is shutdown system 3 accumulator pressure should keep the brake applied for an extended period of time

Question 17

How are the tires thermally protected from blowout?

Answer 17

through the use of four thermal fuse plugs in each wheel

Question 18

What are the brake accumulators charged to

Answer 18

750psi

Question 19

How many brake applications are available from an accumulator charge?

Answer 19

up to 6

Question 20

Can braking be accomplished through the use of accumulator pressure?

Answer 20

yes

Question 21

Where is the brake energy chart found?

Answer 21

QRH1

Question 22

What is the minimum turn around time after a landing or rejected takeoff?

Answer 22

15 minutes to insure max brake temperature

Question 23

What is touchdown protection?

Answer 23

Guards from inadvertent landing with the brakes applied if the pilot is pressing the brake pedals. Braking will not be applied until a wheel spin up to 35 knots is achieved, or weight on wheels plus 5 seconds

Question 24

What is locked wheel protection?

Answer 24

The anti skid control unit (ASCU) monitors each wheel to ensure even rotation. If one wheel enters a skid and is at least 30 percent slower than the others, the ASCU will release brake pressure to that wheel to balance the rotation speeds

Question 25

What holds the MLG in the extended position?

Answer 25

Mechanical over centering with down locks

Question 26

What holds the nose gear in the retracted position?

Answer 26

A spring loaded over-center type locking mechanism

Question 27

What holds the main gear in the retracted position?

Answer 27

Mechanical up locks and hydraulic system 3 pressure

Question 28

What controls the landing gear?

Answer 28

The Proximity Sensing Electronic Unit PSEU

Question 29

what position are the nose gear doors in the down gear position?

Answer 29

The doors are open

Question 30

What ensures the nose wheel is centered prior to reaction into the wall?

Answer 30

the ECU sends a signal to center after takeoff, then a centering cam keeps it centered when hydraulic pressure is removed.

Question 31

When will the “TOO LOW GEAR” aural warning sound?

Answer 31

with radar altitude below 500 feet at a speed of less than 190 KIAS

Question 32

why is it important not to move the tiller in flight with the gear extended?

Answer 32

The steering will be inoperative as annunciated by a STEER INOP message on EICAS upon landing however you will have no warning in flight.