Landing Gear and Brakes Flashcards
How many ways can you activate the brakes?
3 ways Feet, Hands, Automatically
What is the difference between HI and RTO?
HI- 4m/s deceleration
RTO - Maximum deceleration
Will the plane stop in the same distance with Autobrakes and Thrust Reverser and No Thrust Reverser?
Yes, the thrust reverser just takes some of the work away from the brakes. Auto Brakes are just a deceleration rate
What gives a green light to the pushback crew?
Steering OFF Brakes released Nose Gear Towing light is green
How many ways to disconnect nose wheel steering?
Hydraulic system 2 fail
Steering disconnect switch
External Steering Switch Off
What conditions must be met for the auto brakes to be ARMED to RTO?
Selector Knob Position - RTO
Weight on Wheels
Wheel Speed Below 60 knts
No Faults
Any Brake Pedal Position
Thrust levers at Idle or REV
What conditions must be met for RTO to recognize a reject?
Selector Knob - RTO
Weight on Wheels
Wheel speed above 60 knots
No Faults
Brakes not pressed
Thrust levers at Idle or REV
What conditions must be met for the auto brakes to be DISARMED from RTO?
Selector Knob - Not in RTO
In Flight
Faults detected below 60knots of wheel speed
20% Brake pressure applied
Thrust levers > idle
What releases the autobrakes?
20% brake pressure applied System faults
Thrust levers > idle
When would you press the DN LOCK REL button?
When you need the gear up to clear obstacles
How many ways are there to lower the landing gear? What are they?
3, landing gear lever, alternate gear extension, and electrical override
What does the electrical override switch do?
Electrically bypasses the sensors and evaluation computers and extends the gear
What does the Alternate Gear Extension lever do?
If hydraulic pressure is not available it will release hydraulic pressure in the lines and mechanically releases all uplocks. Gear extends via gravity may be necessary to yaw to fully extend
Systematically, what happens when the landing gear lever is selected up or down?
Selecting down releases hydraulic pressure for the nose and main uplocks as well as the retraction actuators. The landing gear doors are mechanically opened
How does aircraft know to give a green down indication on the EICAS (what component verifies this signal)? What does amber and red mean?
The Proximity Sensor. Amber means wheels in transit. Red means gear disagree.
What causes a LG LEVER DISAG message? How is this fixed?
When the Proximity Sensor Evaluation Module (PSEM) senses a wheel not locked down. We would use the electrical override to bypass the PSEM and commands the same extension sequence as normal operation.
What causes a LG LEVER DISAG message? How is this fixed?
When the Proximity Sensor Evaluation Module (PSEM) senses a wheel not locked down. We would use the electrical override to bypass the PSEM and commands the same extension sequence as normal operation.
What does the landing gear warning inhibit button do?
Inhibits the warning and aural warning in the event of dual RA failure only if the Slat/Flap lever is in the 0, 1, 2, 3, or 4 position
What does the landing gear warning inhibit button do?
Inhibits the warning and aural warning in the event of dual radio altimeter failure only if the Slat/Flap lever is in the 0, 1, 2, 3, or 4 position
When would someone use the DN LOCK REL button?
To raise the gear for terrain avoidance
Steering limitations? Tiller pedal turn width
Pedals: 7 degrees left and right
Tiller: Up to 76 degrees
Minimum Turn Width: 59ft 2in
Minimum Taxiway Width: 50ft
Describe the following brake protections: Automatic wheel braking
stops the main wheels during gear retraction
Touchdown protection
only allows braking when wheel speed above 50 knots or 3 seconds after touchdown
Locked wheel protection
prevents locked wheels by comparing inboard/outboard speeds if wheel speed is 33% or below the other wheel the brake pressure will be 0 on the slower wheel to speed the slower wheel up…active above 30 knots ▪ Anti-skid protection- prevents tire skidding and maximizes brake efficiency by reducing hydraulic pressure if necessary…active at 10knots or greater wheel speed
