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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
<700' RA and low TLA or Any altitude with flaps 5 or more |
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Can the landing gear aural warning be silenced?
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Yes, by pushing the LG WRN INHIB button 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 Alternate gear extension: Manual uplock release opens free-fall sequencing valve |
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What is the purpose of the DN LOCK RLS button on the landing gear lever?
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Mechanically releases the landing gear lever lock
Lock protects against inadvertent landing gear reatraction 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 and lever disagreement |
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How do the landing gear doors actuate?
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Mechanically, during extension or retraction
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How are the brakes commanded?
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Brake by wire
Electrically commanded, hydraulically actuated Pedal position transducers send brake requests to the BCM |
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What hydraulic systems provide brake pressure?
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HYD 1: outboard
HYD 2: inboard HYD 1&2: parking |
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What protections are provided for braking?
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Touchdown: No braking until 3 seconds after touchdown or >50 knots wheel speed
Anti-skid: Compares wheel speeds and releases pressure (inop <10 knots) Locked-wheel: Allows up to 33% differential braking for steering purposes (inop <30 knots) |
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How many applications will the parking brake provide?
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6
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What stops the wheels from spinning during retraction?
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Main: BCM applies brakes after WOW
Nose: Snubbers in the nose bay |
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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 nosewheel steering?
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0-40 kts: 76 degrees
41-100 kts: decreases linearly from 76 to 7 |
