14 - Landing Gear & Brakes Flashcards
The red lights for the gear can illuminate when?
- In transit
- Unsafe (disagree with gear lever)
- Below 800 feet with either trust lever to idle
What happens when you open the manual gear extension door?
Manual extension is possible with gear lever in any position.
Landing gear retraction is disabled
What happens when you pull one of the manual extension handles?
The uplock for that gear is released
When does the AUTO BRAKE DISARM light illuminate?
- SPEED BRAKE lever moved to down during RTO or landing
- Manual brakes applied during RTO or landing
- Thrust levers advanced during RTO or landing (except for first 3 seconds of landing)
- Landing with RTO selected
- Power on self test when RTO is selected on the ground (2 seconds)
- A malfunction in the system is detected (continuous)
If the autobrake system is set to RTO, what speed must the airplane reach before it will activate during a RTO?
90 knots
What are the following values on the brake pressure indicator:
a. normal pressure
b. max pressure
c. precharge pressure
a. 3000
b. 3500
c. 1000
The nose wheel can turn how many degrees using only the rudder pedals?
7 degrees
The nose wheel can turn how many degrees using the steering wheel?
78 degrees
Nose wheel steering is usually powered by which hydraulic system
System A
Which system powers gear retraction and extension normally
System A
Which system powers the normal brake system
System B
How does anti-skid differ when normal and alternate brake system is used?
Normally antiskid works on individual wheels. In alternate braking, it works on wheel pairs
What stops wheel spin of the main and nose gear during retraction?
Main gear brakes, and a snubber inside the nose wheel well
What can happen if you retract a spinning broken wheel into the main landing gear compartment
The thread can hit a fitting in the outer ring, causing the wheel to free fall back down. Cannot be retracted after this.
What are the conditions needed for the landing gear transfer unit to operate?
- airborne
- No1 engine RPM drops below a limit value (engine failure)
- landing gear lever is selected up
- either main gear is not up and locked
Why can’t the gear freefall into position when system A pressure is lost, and gear lever is selected down?
System A uses hydraulic pressure to release the uplocks.
What will happen if there is a leak in the landing gear transfer unit, causing a leak and loss of System A, and you then select alternate steering?
If system B senses a loss of fluid through the transfer unit, it will shut off a valve, effectively stopping all nose wheel steering
What do you have to do to switch from normal to alternate braking?
It is done automatically after the loss of System B
Will you still have autoskid with loss of both hydraulic systems?
Yes
When does autobrake application start during landing?
Both forward thrust levers in idle.
Main wheel spin up
Can you select autobrakes after landing?
Yes, up until 30 knots ground speed
What are the different ways you can disarm the autobrake system during landing rollout or RTO
- Moving SPEED BRAKE lever down
- Advancing the thrust lever (except for the first 3 seconds after landing)
- applying manual brakes
- moving the autobrake selector to off
How many air/ground sensors are there on the plane?
6, 2 in each landing gear strut
When is rudder pedal nosewheel steering disabled?
When the nosegear strut extends (takeoff)
