FORWARD LARGE CARGO DOOR SYSTEM -CONTROL SWITCHES
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FORWARD LARGE CARGO DOOR SYSTEM -PROXIMITY SENSORS
Purpose
Proximity sensors supply door and door mechanism position information to the proximity sensor electronics unit (PSEU) for door operational control and door status indications.
Physical Description
The sensors are electrical devices that work with metal targets.
Functional Description
These sensors are for door operation control:
*
Door up
*
Door latched
*
Door unlatched
*
Latch range
*
Handle unlocked.
The door status indication sensors are:
*
Door closed
*
Door latched
*
Door locked.
See the door warning system section for more information on the door status sensors (SECTION 52-71).
Each sensor has a related target. The sensor senses if the target is near or far. The position information goes to the PSEU.
The door operation control sensors tell the PSEU the position of the door and door mechanisms. The PSEU uses the information to control the cargo door operation and the door control panel indication lights.
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FORWARD LARGE CARGO DOOR SYSTEM -PROXIMITY SENSORS
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FORWARD LARGE CARGO DOOR SYSTEM -ELECTRICAL OPERATION
General
The large cargo door uses power from the ground handling bus for electrical operation.
WARNING: DO NOT OPERATE THE DOOR IN WINDS MORE THAN 40 KNOTS. DO NOT LET THE DOOR STAY OPEN IN WINDS MORE THAN 65 KNOTS. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
WARNING: DO NOT OPEN THE DOOR WHEN THE AIRPLANE IS PRESSURIZED. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
Controls
The cargo door lock handle is on the outside of the door. There is an internal and an external release.
The external door control switch is on P43. The internal door control switch is in the cargo compartment ceiling.
Displays and Indications
Indication lights on the external control panel supply door operation information.
Witness ports on the door let you see the position of the door latches and locks.
EFFECTIVITY
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Unlock Operation
WARNING: STAY AWAY FROM THE PATH OF THE LOCK HANDLE. THE LOCK HANDLE IS SPRING-LOADED TO OPEN WHEN YOU PULL THE CATCH RELEASE LEVER AND INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
Release the lock handle to unlock the cargo door. If the vent door opens, the cargo door has unlocked. This enables cargo door electric operation.
Unlatch and Open Operation
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE PATH OF THE DOOR ON THE EXTERNAL SIDE. THE DOOR OPENS OUTBOARD AND UP. INITIALLY, THE DOOR MOVES DOWN BELOW THE DOOR CUTOUT. THE MOVEMENT OF THE DOOR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
CAUTION: DO NOT OPERATE THE DOOR ELECTRICALLY MORE THAN 2 FULL OPEN/CLOSE CYCLES WITHIN 5 MINUTES. DAMAGE TO THE LIFT MECHANISM CAN OCCUR.
Move either the external or the internal switch to the open position. The door unlatches.
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FORWARD LARGE CARGO DOOR SYSTEM -ELECTRICAL OPERATION
Continue to hold the switch in the open position. The door moves to the full up position. When it stops. The amber door up light on the P43 comes on. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 Doors 舱门(22)
