777 AMM 飞机维护手册 起落架 Landing Gear(62)

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The format shows individual gear position for non-normal conditions.
Single-Symbol Display
The single symbol display shows the all gears down and locked condition with a green DOWN, in a box.
A white hatched box shows the gear in the in-transit condition.
An empty white box shows the loss of gear position data.
The display shows the all gears up and locked condition with a white UP, in a box. This display goes out of view approximately ten seconds after the gear moves to this position.
Multi-Symbol Display
The landing gear display shows all three gears for these conditions:
* There is a disagreement between the landing gear lever and the landing gear position for more than 40 seconds (normal actuation time is approximately 17 seconds for retraction and 23 seconds for extension)
* The landing gear doors are open (alternate extension or ground operation of the landing gear doors).
The display shows the gear down and locked condition with a green DN, in a box.
The display shows the gear in-transit condition with a white hatched box.
The display shows the gear up and locked condition with a white UP, in a box.
An empty white box shows the loss of position data for the applicable gear.
EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -EICAS DISPLAY

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LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -ALERT AND STATUS MESSAGES

Alert Messages
These alert messages show for non-normal landing gear conditions:
*
CONFIG GEAR (Warning) -any landing gear is not down and locked and the airplane is in a landing configuration (the flap lever is in a landing position or a thrust lever is at idle with the radio altitude less than 800 feet)

*
GEAR DISAGREE (Caution) -disagreement between the landing gear lever and one or more gear positions 40 seconds after landing gear lever movement

*
MAIN GEAR BRACE L (Caution) -one brace on the left gear is unlocked for more than 40 seconds after the landing gear lever is in the down position and the other brace on the left gear is locked

*
MAIN GEAR BRACE R (Caution) -one brace on the right gear is unlocked for more than 40 seconds after the landing gear lever is in the down position and the other brace on the right gear is locked

*
GEAR DOOR (Advisory) -one or more landing gear doors are not closed 40 seconds after landing gear lever movement. This message also shows after an alternate extension or after ground door operation.

Status Messages
The GEAR INDICATION SYS status message shows for any of these conditions:
*
Failure of both up sensors on the same gear

*
Failure of both door sensors on the same gear

*
Failure of any side brace sensor

*
Failure of any drag brace sensor

*
Failure of either NLG down sensor

*
Failure of either NLG locked sensor

*
Failure of any truck tilt sensor

*
Failure of either NLG not-compressed sensor

*
Invalid PSEU channel.

One or more of these status messages show for landing gear door sensor or gear uplock sensor failures:
*
L GEAR DOOR SENSOR

*
R GEAR DOOR SENSOR

*
NOSE GEAR DOOR SENSOR

*
L GEAR UPLOCK SENSOR

*
R GEAR UPLOCK SENSOR

*
NOSE GEAR UP SENSOR.

EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -ALERT AND STATUS MESSAGES

EFFECTIVITY BEJ ALL  32-61-00 
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LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -MULTI-FUNCTION DISPLAY

General
The multi-function display shows landing gear position data on the landing gear synoptic display. Additional landing gear data and PSEU outputs show on the landing gear actuation/ indication maintenance page.
Landing Gear Synoptic Display
The landing gear synoptic display shows the position of the landing gear doors.
The display shows a door closed condition with the word CLOSED in white, in a box.
The display shows a door not closed condition with a white hatched box.
The display shows a loss of input data from both PSEUs with an empty white box.
Landing Gear Actuation/Indication Maintenance Page
The landing gear actuation/indication maintenance page shows the NEAR/FAR position for all the landing gear proximity sensors for both PSEUs.
The display shows the loss of a proximity sensor input or an invalid input as an empty space.
　
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