Landing Gear Flashcards
Pressurizing system 4 before pressurizing the other systems precludes what?
Transfer of hydraulic fluid from system 1 or 2 to system 4
The normal brake hydraulic system is powered by which hydraulic system?
4
After alternate gear extension, the gear doors are in what position?
Open
The autobrake system provides braking until when?
A complete stop
or
the system disarmed
What would cause the autobrake system to disarm immediately?
Advancing thrust levers or fault
What is the source of the ground speed information provided to the antiskid controller?
The IRUs
In flight, the gear lever lock is released when what two conditions are met?
Main gear is tilted and body gear is centered
Body gear steering operates when the nosewheel steering angle exceeds __ degrees.
20
The body gear is hydraulically centered and body gear steering is deactivated as the aircraft accelerates through what speed?
20 knots
For which hydraulic brake systems are autobrakes available?
Normal
If hydraulic system 4 pressure is low, which hydraulic system would supply pressure to the alternate brake hydraulic system?
1
Rather than to individual wheels, the alternate brake system provides antiskid protection to the wheels how?
Lateral wheel pairs
During takeoff, with RTO selected, when would RTO engage?
Aircraft on ground, groundspeed > 85 knots, and all thrust levers closed.
Loss of which hydraulic systems causes the brake source light to illuminate?
4, 1, 2
Which brake hydraulic system provides main gear wheel with individual antiskid protection?
Normal
At what speed is the RTO autobrake function inoperable if an RTO is initiated?
below 85 knots
The autobrake system is only available through which of the following?
Normal brake system
Which autobrake setting provides maximum braking?
RTO
When are autobrakes disarmed?
DISARM or OFF are selected, manual brakes are applied, or any Thrust Lever is advanced
For landing, the 5 levels of autobrake settings modulate autobrake pressure based on what?
Deceleration rate
Body gear steering is reactivated when decelerating past what speed?
15 knots
Rudder pedals will steer the nosewheel up to what angle?
7 degrees
The tiller will steer the nosewheel up to what angle?
70 degrees
Which hydraulic brake systems have antiskid protection?
Normal and alternate
Is it possible to stop the aircraft with the brake accumulator?
No
How are alternate brakes powered?
Hyd system 1 or system 2 if 1 is unpressurized
What does the BRAKE SOURCE light indicate?
Loss of Hydraulic system 4, 2, and 1
Which hydraulic system pressurizes the parking brake accumulator?
4
Can the parking brake be set with only the alternate brake hydraulic system pressurized?
Yes
How can parking brakes be set?
Hyd system
2 alternate brakes and normal brakes
During gear retraction, how is main gear wheel rotation stopped?
Brakes are applied on the main gear wheels automatically
During alternate gear extension, how are the gear uplocks and gear door latches released?
Electically
After landing when does autobrake application begin?
Main wheels have spun up and all Thrust Levers are closed
Autobrakes are available with what?
Normal brakes
How are autobrakes powered?
Hydraulic system 4
Alternate Landing Gear Extension speed limits
Do not exceed the gear EXTEND limit speed
(270K/.82)
*reduction of speed to below 0.60 Mach may be needed for the wing gear to lock down.
What are the 3 conditions for the RTO to command Maximum braking pressure?
- Airplane on ground;
- Ground Speed > 85kt
- All Thrust Levers Closed.
What are the 3 conditions for the AUTO BRAKE to begin brakes application?
- All Thrust Levers closed;
- Ground Mode sensd (tilted)
- Wheels have spun up.
Auto brakes disarms when?
- Manual Brakes applied;
- Any Thrust Lever advanced;
- Speed Brake move forward;
- Disarm or Off selected;
- Fault on the system.
