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15 Cards in this Set

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How is the landing gear extended and retracted?
Electrically commanded and hydraulically actuated
When will the aural warning for the landing gear sound?
If the gear is not down and locked and < 1200 feet RA and low TLA, or Any altitude with flaps > or equal to 5
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 modes?
Normal: LG lever down
Electric override: Bypasses PSEM to directly command selector valve
Alt. gear extension: Manual uplock release opens free-fall sequencing valve. (Pulling the lever releases residual hydraulic pressure in landing gear lines and opens all uplocks. The gear extends in a free fall with aid from gravity and aerodynamic forces.
What is the purpose of the DN LOCK RLS button on the landing gear level?
Mechanically releases the landing gear lever lock Lock protects against inadvertent landing gear retraction when WOW
What keeps the gear locked in position?
Extended: Downlock springs Retracted Uplock hooks
Describe the landing gear indications?
Green Down & locked White Up & locked Amber In transit Red Gear position & lever disagreement (20 sec grace period)
How do the landing gear doors actuate?
Mechanically, during the 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 1 & 2 Parking/emergency brake
What protections are provided for braking?
Touchdown - No braking until 3 seconds or > 50 kts wheel speed Anti-skid - Prevents skidding (inop < 10 kts) (not available on parking/emergency brake)
Locked-wheel - Compares left & right outboard or inboard brakes & keeps them within 33% speed of each other (inop <30 kts)
How many applications will the parking / emergency brake provide?
6 applications or 24 hours as a parking brake
What stops the wheels from spinning during retraction?
Main gear BCM applies brakes after WOW Nose gear Snubbers in the nose bay stop the wheels
Which hydraulic system controls the nosewheel steering?
HYD 2
What are the limits for the nosewheel steering?
Angle varies with ground speed Up to 40 kts +/- 76º 41 - 100 kts Decreases linearly from 76º to 7º