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15 Cards in this Set
- Front
- Back
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How is the landing gear extended and retracted?
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Electrically commanded and hydraulically actuated
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When will the aural warning for the landing gear sound?
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If the gear is not down and locked and < 1200 feet RA and low TLA, or Any altitude with flaps > or equal to 5
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Can the landing gear aural warning be silenced by pushing the 'LG WRN INHIB' button?
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Only if both radio altimeters have failed
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What are three landing gear extension modes?
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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. |
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What is the purpose of the DN LOCK RLS button on the landing gear level?
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Mechanically releases the landing gear lever lock Lock protects against inadvertent landing gear retraction when WOW
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What keeps the gear locked in position?
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Extended: Downlock springs Retracted Uplock hooks
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Describe the landing gear indications?
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Green Down & locked White Up & locked Amber In transit Red Gear position & lever disagreement (20 sec grace period)
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How do the landing gear doors actuate?
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Mechanically, during the landing gear extension or retraction
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How are the brakes commanded?
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Brake by Wire
Electrically commanded and hydraulically actuated Pedal position transducers send brake requests to the BCM (Brake Control Module) |
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What hydraulic system(s) provide brake pressure?
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HYD 1 Outboard brakes
HYD 2 Inboard brakes HYD 1 & 2 Parking/emergency brake |
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What protections are provided for braking?
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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) |
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How many applications will the parking / emergency brake provide?
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6 applications or 24 hours as a parking brake
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What stops the wheels from spinning during retraction?
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Main gear BCM applies brakes after WOW Nose gear Snubbers in the nose bay stop the wheels
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Which hydraulic system controls the nosewheel steering?
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HYD 2
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What are the limits for the nosewheel steering?
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Angle varies with ground speed Up to 40 kts +/- 76º 41 - 100 kts Decreases linearly from 76º to 7º
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