Landing Gear & Brakes Flashcards
When will the aural warning for the landing gear sound?
If the gear is not down and locked, and
Flaps any position and < 700’ RA and low TLA
Flaps 5 or Full
How was the landing gear extended and retracted?
Electrically commanded and hydraulically actuated
Can the landing gear aural warning be silenced by pushing the ‘LG WRN INHIB’ button?
Only if both radio altimeters have failed
What are three landing gear extension moods?
Normal- LG lever DOWN
Electric override- bypass PSPM to directly command selector valve
Alternate gear extension- Manuel a block release opens free-fall sequencing valve
What is the purpose of DN LOCK RLS button on the landing gear lever?
Mechanically releases the landing gear lever lock.
Lock protects against inadvertent landing here retraction when weight-on-wheels.
Describe the landing gear indications
Green Down & locked
White Up & locked
Amber In transit
Red Gear position and lever disagreement (20 sec grace period.)
What keeps the gear locked in position?
Extended Downlock Springs
Retracted Uplock hooks
How do the landing gear doors actuate?
Mechanically, during landing gear extension or retraction
How are brakes commanded?
Brake by wire
Electrically commanded and hydraulically actuated
Pedal position transducers send brake request to the BCM (brake control module)
What hydraulic systems provide brake pressure?
HYD 1 outboard brakes
HYD 2 inboard brakes
HYD 1 & 2 parking brake/emergency brake
What protections are provided for braking?
Touchdown no braking until 3 seconds or >50 kts wheel speed after touchdown
Anti-skid compares wheel speeds and releases pressure (inop <30 kts)
How many applications will the parking/emergency brake provide?
6 applications
Which hydraulic system controls the nosewheel steering?
HYD 2
What are the limits for the nosewheel steering?
Angle varies with groundspeed
Up to 40 kts +76°
41 to 100 kts decreases linearly from 76° to 7°
