Landing Gear & Brakes

Question 1

What powers the landing gear system?

Answer 1

Green hyd system

Can be extended by gravity

Question 2

What manages the extension and retraction of the landing gear?

Answer 2

The MFC

Question 3

When will the fusible plugs release tyre pressure?

Answer 3

When they exceed 177 degrees

Question 4

What angle does the nose wheel steering system provide?

Answer 4

60 degrees either side

Question 5

What provides gear position information?

Answer 5

Two independent Position Detection & Indicating Systems

They also control extension and retraction

Question 6

What is the primary system controlled by?

Answer 6

MFC 1A

Provides position indication on the flight instruments panel

Powered by DC stby bus

Question 7

What controls the secondary system?

Answer 7

MFC module 2A

Gera position indication on the overhead panel

Powered by DC Bus 2

Question 8

When can the landing gear be considered down and locked?

Answer 8

As long as one set of landing gear position indicators are green

Question 9

What manages the Weight on Wheels system?

Answer 9

WOW 1 - MFC Module 1B

WOW 2 - MFC Module 2B

Question 10

What are the nose gear door position when the nose gear is extended?

Answer 10

Two forward doors will be closed and two aft doors will be open

Question 11

How is the gear held in the up position?

Answer 11

By an up lock mechanism and hydraulic pressure is removed from the retract side of the gear actuator

Question 12

What assists during an emergency gear extension?

Answer 12

Main - gas actuators and springs

Nose - mechanical extension device

Question 13

What happens to the nose wheel steering system in the absence of hydraulic pressure?

Answer 13

Can be deflected up to 91 degrees either side of centre during towing operations

Question 14

What removes hydraulic pressure from the steering system when the nose gear is not locked down?

Answer 14

A swivel valve

A solenoid valve when main gear and nose gear shock absorbers are not compressed - nose gear will be mechanically centred

Question 15

When will nosewheel steering be available?

Answer 15

After all gear shock absorbers are compressed

If one gear leg comes off the ground after they are compressed, nose wheel steering will be maintained as long as one gear stays on the ground

Question 16

What happens when the nose wheel steering switch is ON?

Answer 16

Steering solenoid valve is armed for operation

Valve opens when steering is commanded

Question 17

How can you steer the aircraft if nosewheel steering is lost?

Answer 17

Differential braking

Differential thrust

Question 18

What is available for braking if park brake handle is in the centre notch?

Answer 18

500 psi

Additional pressure by moving the handle one half an inch aft below 60 kt (above 60kt will supply the whole 3000 psi)

Question 19

When should the tires be visually inspected?

Answer 19

If the emergency and park system were used with a GS above 20 kt

Question 20

What does the anti-skid system provide?

Answer 20

Protection against tire skidding

Locked wheel and touchdown protection

Controls each brake pressure to achieve maximum stopping performance

Question 21

When does the anti-skid system become available?

Answer 21

As soon as the landing gear is down and locked and as long as aircraft GS is above 10 kt

Question 22

What will the anti-skid system do if it senses that a wheel is skidding?

Answer 22

It will release hydraulic pressure to the associated brake to alleviate the skidding

Question 23

What is locked wheel protection?

Answer 23

Compares the wheel speeds of the inner pair of main gear wheels and the outer pair

Locked wheel signal generated if there is a speed difference of more than 50%

Brake pressure will be released to prevent wheels from locking

Question 24

When is locked wheel protection available?

Answer 24

When the ground speed is above 23 kt

Question 25

What is touchdown protection?

Answer 25

Brakes are prevented from operating for the first 5 seconds after touchdown or as long as wheel speed is below 35 kt Prevents the use of brakes prior to wheel spin up on low friction pavements or if there is a light load in the wheels

Question 26

When will the red light on the landing gear handle illuminate?

Answer 26

As long as the gear is not sensed to be in the down and locked position

Question 27

When will the UNLK caption illuminate red?

Answer 27

When associated gear is not locked in the position selected by the landing gear lever If the aircraft is on the ground and the associated unlock box is not in the open position

Question 28

What happens when the emergency gear extension handle is used?

Answer 28

Uplocks are released and a valve is opened to allow fluid in the lines to return back to the reservoir Gears falls by gravity assisted by a compressed gas strut

Question 29

When is the emergency brake usable?

Answer 29

Speed sup to V1

Question 30

When will you get a BRK TEMP HOT light?

Answer 30

When at least one brake temperature exceeds 160 degrees Pressing the BRK TEMP TEST pb will illuminate the lgiht

Question 31

What does an amber F on the anti-skid panel mean?

Answer 31

A failure of the associated anti-skid channel In this case the anti-skid function is lost completely

Question 32

When can you do the anti-skid test pb?

Answer 32

If the aircraft is on the ground or in flight Should not be done if the park brake is not set when the aircraft is on the ground with engines running

Question 33

What is the anti-skid test?

Answer 33

Test is performed by applying brakes through the brake pedals Will last 6 secs and brakes will be compressed and released Fault lights will illuminate during the test Failure is indicated if the fault light remains on after the test

Question 34

When is the anti-skid test mode inhibited?

Answer 34

When the aircraft is on the ground and GS exceeds 17 kt