Flashcards in Landing Gear and Brakes Deck (15):
How is the landing gear extended and retracted?
Electronically commanded and hydraulically actuated
When will the aural warning for the landing gear sound?
-If the gear is not down and locked, and
Can the landing gear aural warning be silenced by pushing the 'LG WRN INHIBIT' button?
Only is both Radio Altimeters have failed
What are the 3 Landing Gear extension modes?
-Normal - LG lever Down
-Electric Override - Bypasses PSEM to directly command selector valve
-Alternate Gear Extension - Manual uplock release opens free-fall sequencing valve
What is the purpose of the DN LOCK RLS button the landing gear lever?
-Mechanically releases the landing gear lever lock
-Lock protects against inadvertent landing gear retraction when WOW
What keeps the gear in the locked position?
-Extended - Down lock springs
-Retracted - Uplock hooks
Describe the Landing gear indications
-Green - Down and Locked
-White - Up and locked
-Amber - In transit
Red - Gear position and lever disagreement (20sec grace period)
How do the landing gear doors actuate?
Mechanically, during landing gear extension or retraction
How are the brakes commanded?
-Brake by Wire
-Electrically commanded and hydraulically actuated
-Pedal position transducers send brake requests to the BCM (Brake Control Module)
What Hydraulic system(s) provide brake pressure?
-HYD 1 - Outboard brakes
-HYD 2 - Inboard brakes
-HYD 3 - Parking/Emergency Brake
What protections are provided for braking?
-Touchdown - No braking until 3 seconds or >50kts wheel speed after touchdown
-Anti-skid - Compares wheel speeds and releases pressure (inop
How many applications will the parking/emergency brake provide?
What stops the wheels from spinning during retraction?
-Main - BCM applies brakes after Weight off Wheels
-Nose - Snubbers in the nose bay stop the wheels
Which HYD System controls the nosewheel steering