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How is the landing gear extended and retracted?
Electrically commanded and hydraulically activated
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When s the landing gear INHIB warning switch used?
To inhibit the landing gear warning in the event of dual radio altimeter failure.
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Can the landing gear aural warning be inhibited by pushing the landing gear INHIB button?
Yes, only if both radio alt have failed and flaps are set 0 to 4
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What 2 situations can the landing gear aural warning not be silenced?
SLAT / FLAP in the 0 through 4 position
- Radio alt below 700 AGL
- Thrust lever is set below a predetermined mid range position
Or, SLAT / FLAP 5 or full at any altitude or TLA
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What are the 3 landing gear extension modes?
Normal, Alt, Electrical override
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What is the purpose of the down lock rls button on the landing gear lever?
Manually releases the landing gear lock if gear won’t retract on takeoff and terrain imminent
Lock protects against inadvertent landing gear retraction when weight on wheels
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Activation of the dn lock rls button is prohibited for all takeoffs unless what?
Unless required for obstacle clearance
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When would you use alt gear extension procedures?
If hydraulic pressure is not available for gear operation or the electrical system fails.
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When would you use the electrical override switch?
When the landing gear lever control box fails. Bypasses the PSEM and commands gear extension in the same sequence as normal.
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What keeps the gear locked in position?
- Extended. Down lock springs
- Retracted. Uplock hooks
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Describe the landing gear indications?
Green. Down and locked
White. Up and locked
Amber. In transit
Red gear position and lever disagreement ( 20 sec grace period)
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What does a red icon indicate on the landing gear lever position indicator?
A discrepancy between the lever and the landing gear position
Landing gear kept in transit and is not locked in the commanded position
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how do the landing gear doors actuate?
Mechanically, during the extension or retraction
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How are the brakes commanded?
- Brake by wire
- Electrically commanded and hydraulically activated
- Pedal position transducers send brake requests to the BCM (Brake control module)
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What hydraulic systems provide the brake pressure?
- Sys 1 outboard brakes
- Sys 2. Inboard brakes
- 1 and 2. Parking // Emergency brakes
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What protections are provided for the braking?
Touchdown. No braking until 3 sec after WOW or wheel speed greater than 50 kts.
Anti skid. Reduces wheel brake pressure in order to recover wheel speed and prevent skidding (inop below 10 kias)
Locked wheel. If a wheel speed is 33% or below its associated paired wheel speed, BCM commands zero pressure to the brake of the slower wheel, allowing speed equalization. ( inop below 30 kias)
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When is locked wheel protection deactivated?
Below 30 kias
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How many full brake applications will the parking / emergency brake accumulator provide?
6 full applications
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Can the parking brake be used to stop if you lose hydraulics?
Yes
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When is the anti skid deactivated?
Wheel speed below 10 kts
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Is the anti skid available when using the emergency parking brake?
No
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How do you know that the parking brake is set?
An ON light illuminates on the EMER / PARKING BRAKE light.
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What disengages the rudder pedal steering?
Activation of nose wheel steering.
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When is hand wheel steering mode engaged?
When hand wheel steering is kept pressed.
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When do you use hand wheel steering mode?
Low speed control
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Which steering mode is used for high speed control?
Rudder pedal steering mode
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How do you engage the nose wheel steering system?
Nose wheel steering must be pushed down
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Which hydraulic system controls nose wheel steering?
2
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How is nose wheel steering limit affected by wheel speed?
As wheel speed increases, nose wheel limit decreases
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What conditions must be met for the auto brakes to engage during a rejected TO?
- Thrust levers idle or REV
- Wheel speed above 60 KTS
- Brake pedal not pressed
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How are the auto brakes disarmed?
- Selector switch set to OFF
- pedal braking is applied
- Brake control system failure is detected
- Either thrust lever is advanced beyond idle during AUTOBRAKE application
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What is max gear speed?
250
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What is max tire ground speed?
195
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Do not takeoff with color brake temp indicators.
Other than green
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What is the memory item for STEERING RUNAWAY?
STEER DISC SWITCH..... PRESS
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Turn radius for a 180 degree turn?
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What determines the min obstruction clearance path for each aircraft?
Horizontal stab tip
With extended winglets, it’s the winglet
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If the brake indicator pins are flush, do we still have brakes left?
Yes
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What indications do you need to be safe for the pushback?
- Green towing light on the nose gear
- Parking brake ON light extinguished
- STEER OFF EICAS displayed
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What conditions will give you a green towing light on the nose gear?
- Steering disengaged
- Parking brake no set
- Toe brakes not applied
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What does the red guarded switch on the forwards ramp panel do?
Disengages the nose wheel steering and enables nose wheel steering
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