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23 Cards in this Set
- Front
- Back
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The LDG GEAR lever signals the PSEU how
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Electrically signals the PSEU to operate the gear in the selected direction
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Pushing the DN LCK REL button
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Mechanically retracts a pin to permit UP selection of the LDG GEAR handle
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Gear indications (UP,DN, on in transit) are shown on ED 1
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If either gear or flaps are extended
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The GEAR DISAGREE warning EICAS message appears if
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One or more gear do not unlock from the current position 6 secs after gear selection
One or more gear do not reach the selected position 28 seconds after gear selection |
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Gear downlocking is
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Monitored by the PSEU through a pair of proximity switches on each gear
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If all gear are downlocked wher is hydraulic pressure applied
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Hydraulic pressure remains applied to the extended side of the gear actuators and to the close side of the door actuators
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Nosewheel steering becomes active when the NOSE STEER swithch is selected to the ARMED position and
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The nose gear is downlocked and the PSEU detects the aircraft on-ground
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What is the nosewheel position if the steering tiller is rotated full left and the right rudder pedals are simultaneously pused full travel
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48 degrees left
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What indication is shown if the nose doors fail to close after nose dear downlocking
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The nose gear indication is shown as green DN
The NOSE DOOR OPEN warning EICAS message and "Nose Door" aural are activated |
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The nose doors may be opened and closed by
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Operating the switch in the AC power receptacle on the forward right fuselage with No. 3 hydraulic pressure available
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The downlock assist springs on the nose gear drag brace
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Pulls the nose gear drag brace over center during gear extension
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The downlock assist actuator on each main gear drives
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the main gear to full down position during alternate gear extension
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Pulling the red LG PULL handle on the rear pedestal mechanically opens
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The uplocks on each gear and the nose doors
The dump valves for the main and nose gear and the nose doors A valve which applies No. 2 hydraulic pressure to the assist actuator on each main |
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The unsafe gear horn
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Is inhibited for 2 minutes after takeoff
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Display of the PARK BRAKE SOV caution message
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Also triggers the A/SKID INBD caution message.
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The brake weare indicators on each brake assembly are accurate
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Only when hydraulic systems No. 2 and 3 are pressurized and the park brake is set
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The anti skid system prevents locked wheels by
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Monitoring the rpm between paired wheels (inboard-inboard, outboard-ouboard)
Reducing brake pressure on the slower wheel when speed differential between paired wheels increases by 50% |
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The antiskid system Is automatically inhibited when
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The rpm of all wheels decreases to 10kts or less
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Antiskid system testing is inhibited when
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The parking brake is set
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The MLG BAY OVHT warning EICAS message could be caused by
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Hot brakes on one or both main landing gear
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The brake pressure indications shown in the HYDRAULIC synoptic page indicate what pressure
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Accumulator pressure for the related brake system
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If the parking brakes are set (PARKING BRAKE handle pulled) then
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Only the inboard brakes retain braking pressure if no hydraulic pumps are operating
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During takeoff the main gear wheel rotation is stopped by
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Automatically by nose gear upline pressure applied to the brake metering valves during gear retraction
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