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38 Cards in this Set
- Front
- Back
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How is the landing gear extended and retracted
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Electrically controlled
Hydraulically actuated |
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When will the aural warning for the landing gear sound
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Radio altitude below 1200 ft or dual radio altimeter failure and:
Either thrust lever is set below 45 degree TLA (2 engine) or thrust lever is set below 59 degrees TLA (one engine) Flaps set to 5 or Full |
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Can the landing gear aural warning be silenced by using the LG WRN INHIB button
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Only in the event of dual radio altimeter failure
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What are the three landing gear extension modes
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Normal-LG gear lever down
Electric overide-Bypasses the PSEM to directly command the selector valve Alternate gear extension-Manual uplock release opens free fall sequencing valve |
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What is the purpose of the DWN LCK REL button
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Mechanically releases the landing gear level lock
Protects against gear retraction when WOW |
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What keeps the gear locked in position
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Extended-Down lock springs
Retracted-Uplock hooks |
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Describe the landing gear lever indications
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Green-down and locked
White-up and locked Amber-in transit Red-gear positon and lever disagreement |
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How does the landing gear doors actuate
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Mechanically during extension and retraction
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How are the brakes commanded
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-Brake-by-wire
-Electrically controlled -Hydraulically actuated -Pedal position transducers send brake request to the brake control module (BCM) |
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What hydraulic system controls the emergency brake
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1 and 2
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What hydraulic system controls the outboard brakes
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1
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What hydraulic system controls the inboard brakes
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2
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Explain touchdown protection
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Prevents wheel brakes from being applied until 3 seconds after tochdown or when wheel speed is above 50 knts
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Explain anti-skid protection
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Compares wheel speeds and releases pressure in order to recover wheel speed
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When is the ant-skid protection deactivated
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Below 10 knots
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Is anti-skid available for the emergency parking brake system
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No
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Explain locked wheel protection
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Prevents a main landing gear wheel from locking. System logic compares wheel speed signals between the left and right inboard or outboard wheels. If the system detects a locked wheel, it commands zero pressure to the brake of the slower wheel
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When is locked wheel protection deactivated
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Below 30 knts
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In the event of hydraulic system 1 and 2 failure how many applications will the emergency parking brake allow
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6
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Is there any braking protection on the emergency parking brake system
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No
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What stops the wheels from spinning during retraction
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Main gear-BCM applies brakes after weight-off-wheels
Nose gear-snubbers |
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Which hydraulic system controls the nose wheel steering
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2
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What is the maximum nose wheel steering
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76 degrees up to 40 knots, then decreasing linearly form 76-7 degrees (41-100 knts)
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How many WOW proximity sensors
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6
2 per gear |
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What does the PSEM (Proximity sensor electronic module) do
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Determines whether the aicraft is on the ground or in the air
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How many down and up lock sensors does each gear have
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2 uplock
2 downlock |
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When using the electrical overide to lower the gear what are we bypassing
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The PSEM
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What happens when the alterate gear extension handle is used to lower the gear
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All hydraulic pressure is released
Mechanically releases all uplocks |
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What is the maximum nose wheel steering using the rudder
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7 degrees
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When would the free wheel steering happen automatically
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Steering angle beyond 76 degrees, failure of WOW sensor, or steering system failure detected
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How many brake wear pins located on each main wheel
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4
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How can we disconnect the steering
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Switch on yoke
Swicth on GPU access panel |
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What does a RED light on the nose gear mean for towing
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Towing not permissible
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How is nose wheel steering possible with only the left engine opearting
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By releasing the emergency parking brake AC STBY pump #2 will turn on allowing steering
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How long after lowering the gear handle would you expect to see a RED ICON indicating a discrepency
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20 seconds
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Is there any indication that tells us the emergency parking brake is actuated
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Yes, a white striped bar illuminates in the EMERG/PRKG BRAKE light located on the instrument panel
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Where can brake pressure and temperature be monitored
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MFD status page
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If the LG WARN INHIB button has been pressed and the white striped bar is illuminated what will cause the light to go out and the system to reset
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-TL >45 degrees TLA (2 ENG)
-TL >59 degrees TLA (1 ENG) -Flaps set to 5 or or full and gear not down and locked |
