Landing Gear and Brakes Flashcards
How are the landing gear extension/retraction and braking functions powered and controlled?
Hydraulically assisted and electronically controlled and monitored
Which hydraulic system powers landing gear retraction and extension?
No 1 hydraulic system
How should the landing gear be lowered if the No.1 engine fails?
Using the normal landing gear handle
How should the landing gear be lowered if the No.1 hydraulic system fails?
Using the free fall handle
Where is the landing gear position indicated?
Primarily on the EICAS, but also on either RMU
What system backups are available in the event of normal extension failure?
The electric override serves as the primary extension backup, and the free fall system serves as a secondary backup
How many proximity switches does the landing gear use to detect when the aircraft is on the ground?
Four. The nose gear proximity switch is not used by the landing gear
Which system use the nose landing gear weight on weight signal?
Thrust reversers and nosewheel steering
How are the nose landing gear doors kept closed when the landing gear is fully retracted?
Hydraulic pressure
If any gear uplock is found in the up position during a pre flight walkaround, how can it be reset?
By activating the landing gear free fall lever
What color is the EICAS landing gear position indicator when the landing gear is in transit?
Yellow and black cross hatched
If the landing gear is not in the selected position after 20 sec, what color is the EICAS display?
Red and black cross hatched
Under what conditions is the landing gear warning message generated when the gear is not locked down?
- RA below 1,200 ft flaps set below 22 degrees, one thrust lever below 59 degrees and the other below 45 degrees
- Flaps set at 45 degrees
What does the brake control unit do as soon as the aircraft is airborne and the gear is selected up?
Automatically applies brake pressure to the main gear wheels
How are the nose gear tires braked upon gear retraction?
Mechanically, via stops located in the nosewheel well
What are the three levels of protection provided by the anti skid system?
-Touchdown protection
-Locked wheel protection
-Anti Skid protection
How does the anti skid function operate?
It releases brake pressure on the wheel it senses is rotating slower
At what speed is anti skid available?
Wheel speed above 10kt during deceleration
At what speed is locked wheel protection available?
Above 30 kt
What does touchdown protection do?
It inhibits brake actuation before the main wheels have accelerated. Braking is inhibited until 3 sec after landing or the wheels have spun up to at least 50 kt
Which hydraulic system powers the emergency/parking brake?
The No.2 system
How many complete emergency brake actuators or hours of parking brake actuation can be relied on from the No.2 system accumulator?
Six emergency brake actuations or 24 hour of parking brake
Are any of the brake protection systems available when using the emergency brake?
No
How is the nosewheel steering system controlled and operated?
It is electronically controlled and hydraulically operated
