LANDING GEAR AND BRAKES CBT Flashcards
What provides an overview of the Landing gear and Brakes?
Hydraulic Synoptic Page
What powers the landing gear and brakes?
Hydraulically actuated.
What powers the outboard brakes?
Hydraulic System 1.
What powers landing gear?
Hydraulic system 2
How do we operate the gear if Hydraulic system 2 fails?
With the assistance of the PTU.
What powers the inboard brakes?
Hydraulic system 2
What powers nosewheel steering?
Hydraulic system 2
What is the Emergency/Parking brake accumulator?
A dedicated accumulator that stores hydraulic pressure from system 1 and 2.
Gives us 6 application of Emergency/Parking brake.
Prior to pushback what must the Captain verify?
Steering OFF
Brakes released
Nose gear towing light is green
When will the STEER OFF message show on EICAS?
Hydraulic System 2 is depressurized.
Steering disconnect switch is pressed.
External Steering disengage is set to DISENGAGE
What are the Landing Gear Position Indications?
Green - Down and locked
White - Up and locked
Amber (cross-hatched) - In transit
Red- Disagreement with lever
What does it mean is the Autobrake status is blank?
The autobrake is disarmed.
If EMER ACCU pressure is amber, what can be done?
Turn on Hydraulic ACMP for system 1 or 2
What is the RTO setting on the autobrake knob?
Rejected Takeoff, it is MAXIMUM braking.
How does the Autobrake detect a rejected takeoff?
Wheel speed above 60kts and Thrust reversers in IDLE or REV.
When do the autobrakes release the brakes in RTO?
at least 20% brake pressure applied
System faults below 60kts
Thrust levers greater than IDLE
If attempting to set RTO, and brake pedals are pressed, what will happen.
Knob will snap back to OFF
After takeoff does the Autobrake knob need to be set to OFF?
NO, when weight OFF wheels is sensed, it will automatically snap to OFF.
In any autobrake setting, when will it release the brakes?
At least 20% brake pressure applied
System faults
Thrust levers greater than IDLE
Upon landing when do the autobrakes activate?
2 seconds after weight on wheels.
What is the slowing rate of each brake setting?
LO 2kts/second
MED 4kts/second
HI- 8 kts/second
What happens if you accidentally bump the gear lever to up position on the ground?
Nothing. the WOW (weight on wheels) sensors mechanically lock the gear lever down.
What is the DN LOCK REL button?
Down Lock Release, it overrides the down lock protections.
When would we use the Landing Gear Warning Inhibit Button?
As directed by the QRH
What happens when the Alternate Gear Extension Lever is pulled?
It releases the hydraulic pressure in the landing gear lines and mechanically releases all landing gear up locks.
What is the Alternate gear extension Electrical override switch for?
Electronically bypasses the sensors and evaluation computers and extends the landing gear.
When setting the parking brake, what indication must we see?
EMERG/PRKG BRAKE light illuminates.
How many wear pins do the gear have? How do we check them?
4 pins per main gear, must be check with the parking brake set.
What is the BCM?
Brake Control Modules.
What protection do the BCMs provide?
Antiskid protection - active 10kts or more
Automatic Wheel braking - Stops main gear during retraction
Touchdown protection - Prevents braking with wheel speed above 50kts or 3 seconds after touchdown.
Locked wheel protection - active above 30 kts.
What is the steering authority of the rudder pedals?
7° left/right with steering engaged.
How do we steer if the steering is disengaged?
Differential thrust and braking.
How is the tiller operated? What is the steering authority?
Pressed and held down
Up to 76° at slow speeds
