Landing gear and Brakes CBT's Flashcards
How many gear trucks are there? How many wheels?
4 main gear trucks and 1 nose gear truck.
Main are divided into: 2 body gear, 2 wing gear.
Each main gear truck has 4 wheels and the nose gear truck has 2. Total wheels, 18.
What powers the gear extension and retraction?
Hydraulic system 1 and 4.
System 1: Body and nose
System 4: Wing gear
What actuates the gear doors?
Wing gear: each has 1 hydraulically and 1 mechanically actuated gear doors
Body gear: each has 1 hydraulically and 2 mechanically actuated gear doors
Nose gear: 2 hydraulically and 2 mechanically actuated gear doors
The wheel brakes have a normal system and an alternate system. How do you switch over to alternate?
It is fully automatic
What system provides power to the wheel brakes?
Hydraulic system 4 (normal)
Hydraulic systems 1 or 2 (Alternate)
How do you set the parking brake?
Push the brakes and pull up on the parking brake lever
Are autobrakes available in alternate brake mode?
No, only in normal
Is anti skid available in alternate brake mode?
Yes
What do the alternate gear extension switches do?
They free fall the gear
What powers the parking brake accumulator?
Hydraulic system 4 (alternate is system 1 and 2)
The brake temperature range is what? What is normal range and what is high range? What color is hot brakes?
Between 0-9
0-4 is normal, 5 or higher are hot brakes
Hot brakes are amber (white are normal)
Minimum brake cooling time if you get EICAS BRAKE TEMP
70 minutes after landing
(refer to QRH brake cooling schedule for specifics)
What is the brake hydraulic system priority?
4, 1, 2
Regarding anti skid, what is the only difference between normal mode and alternate mode?
The normal brake system provides each main gear wheel with individual antiskid protection. The alternate brake hydraulic system operates in a slightly lower capacity and provides antiskid protection to lateral wheel pairs rather than to individual wheels.
Other than anti skid, what brake protection does the system provide?
Touchdown, hydroplane, locked wheel protection, and torque limiting.
Touchdown and hydroplane: Uses inertial speed
Locked wheel: Compares wheel speeds
Torque limiting: Excessive torque detected, releases brake pressure to prevent damage to landing gear
How many Autobrake modes are there?
RTO, 1, 2, 3, 4, MAX
You must be at least ___knots ground speed before the RTO function will work.
85
Is MAX AUTO the same as full brake application manually?
Close, but it’s still less aggressive than stomping on the brakes 100%
On landing, what 3 conditions must be met for the autobrakes to engage?
-On the ground
-Wheel spin up detected
-All thrust levers closed
After autobrakes engage on landing rollout, what conditions would kick them off?
-Pedal brakes applied
-Any thrust lever advanced
-Speedbrake lever moved to DOWN detent
-DISARM or OFF position selected
-Any autobrake or antiskid system fault
-Loss of brake hydraulic pressure
On the autobrake dial, why is there a DISARM and an OFF position?
Once you kick off the autobrakes on landing, it falls to the DISARM position. You must then select OFF to deactivate the system.
