FORWARD LARGE CARGO DOOR SYSTEM -LIFT MANUAL DRIVE
EFFECTIVITY BEJ ALL 52-34-00
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FORWARD LARGE CARGO DOOR SYSTEM -ROTARY ACTUATOR
Purpose
The two rotary actuators transmit torque from the lift power unit torque tubes to the door lift mechanisms.
Physical Description
The actuator has these parts:
*
A dog coupling to the lift drive mechanism
*
Three planetary gear stages (internal)
*
A no-back (internal).
Functional Description
The gears of the actuator reduce the rotation rate from the lift power unit. The teeth transmits torque into the lift mechanism. The free play in the teeth connection lets the door move a small amount without torque from the lift power unit. This lets the latch mechanism operate.
The no-back inside each actuator stops door movement toward closed when you remove power from the lift power unit.
EFFECTIVITY BEJ ALL 52-34-00
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FORWARD LARGE CARGO DOOR SYSTEM -ROTARY ACTUATOR
EFFECTIVITY BEJ ALL 52-34-00
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D633W101-BEJ Jan 05/2002
FORWARD LARGE CARGO DOOR SYSTEM -LIFT MECHANISM
Purpose
The lift mechanisms supply the motion that lifts and lowers the door.
Physical Description
Each lift mechanism has a drive arm and a drive link. One end of the drive arm has a short shaft with a teeth connection to the rotary actuator. The other end is a pivot connection to the drive link. The drive link connects to the door cutout structure.
Functional Description
The lift mechanism takes the rotary motion of the rotary actuator and changes it into motion that lifts and lowers the door.
Training Information Point
If the door fails to open because of a problem with the lift mechanism, lift power drive unit, or rotory actuator, it may be necessary to remove the fasteners at the joint between the drive arm and the drive link at the forward and aft sides of the door. There are two panals (not shown) on the outside of the door that provide access to the fasteners.
WARNING: BLOCK THE DOOR AT THE LOWER EDGE. THE DOOR CAN OPEN SUDDENLY WITH GREAT FORCE AND INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
EFFECTIVITY BEJ ALL 52-34-00
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FORWARD LARGE CARGO DOOR SYSTEM -LIFT MECHANISM
EFFECTIVITY BEJ ALL 52-34-00
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D633W101-BEJ Jan 05/2002
FORWARD LARGE CARGO DOOR SYSTEM -LATCH POWER UNIT
Purpose
The latch power unit supplies torque to the latch cams and the pull-in hooks.
Physical Description
The latch power unit has these components:
*
Latch manual drive connection
*
Latch mechanism connection
*
Electric power connection
*
Three phase, 115/200v ac, 400 Hz motor
*
Gear box
*
Clutch (internal).
Functional Description
The motor supplies torque to the gearbox. The latch manual drive can also supply the torque. The clutch limits the torque supplied to the pull-in hooks and latch cams. This prevents damage when the latch cams or pull-in hooks are not able to move.
EFFECTIVITY BEJ ALL 52-34-00
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FORWARD LARGE CARGO DOOR SYSTEM -LATCH POWER UNIT 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(19)
