A320飞机维护手册 AMM DOORS 舱门4(23)

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R  recess of the handle flap. 
R  (2) Locking Mechanism with Interlock Mechanism 
R 
R  The locking mechanism which is installed in the lower part of the 
R  cargo door includes the subsequent components: 
R  - the locking shaft which has six shaft levers, the control lever, 
R  the interlock cam and the deflection unit with the related link 
R  rod, 
R  - the six locking units which have a locking hook, a bellcrank, a 
R  bellcrank lever and a spring unit, 
R  - the interlock mechanism which includes the interlock lever with the 
R  stop bolt, the connection rod and the spring unit. 
R 
R  The link rod connects the deflection unit with the handle bearing to 
R  transmit the movement of the locking handle to the locking shaft. The 
R  shaft levers operate then the locking units which move their locking 
R  hooks into the locked or released position. The compressed spring 
R  unit of each locking unit makes sure that the locked hooks stay in 
R  the overcenter position. 
R 
R  The interlock mechanism prevents the operation of the locking handle 
R  when the cargo door is still opened. The spring unit moves the 
R  interlock lever to the blocked position so that its stop bolt touches 
R  the interlock cam. 
R  **ON A/C 001-049, 053-099, 101-105, 151-199, 201-220,
 (3) Locking Mechanism with Vent Door Mechanism
 The locking mechanism is installed parallel to and below the latching
 mechanism in the lower part of the cargo door. The primary task of
 this mechanism is to tell the operator that the latching mechanism is
 correctly latched.
 The locking mechanism includes the subsequent components:
 - the locking shaft which has a link rod, six lock cams with a red
 and green mark, a drift pin lever and a vent door lever,
 - the vent door mechanism which opens and closes the vent door, 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-31-00Page 33 1201-220, 1May 01/05 1 1 1CES 1

 - the linkage mechanism which includes the control rod and the gas spring.
 The control rod transmits the movement of the door handle (from 0 degree to 65 degree ) through the Maltese-cross lock to the locking shaft. The lock cams then engage with, or disengage from, the recess of the latching hooks. The engaged lock cams prevent the operation of the latching hooks. Then, the operator can see the green mark on each lock cam through the indication windows of the access panel. When the operator can see a red mark in the indication windows, then the cam locks are disengaged from the latching hooks.
 A connection rod transmits the movement of the locking shaft to the drive shaft of the gear box. The output shaft of the gear box operates the drawbar which opens or closes the vent door.
 (4) Drift Pin Mechanism
 The drift pin mechanism is installed in the middle of the cargo door. It decreases the contour off-set between the fuselage and the door. The drift pin mechanism has a drift pin assy and the linkages mechanism, which includes the connection rods, the control rods, the bearing assy and the housing assy.
 The linkage mechanism transmit the movement of the locking shaft to the drift pins which retract or extent then. When the cargo door is correctly locked, the extended drift pins engage with the pockets of the fuselage frame. 
R  **ON A/C 051-052, 
R R  (3) Safety Mechanism with Vent Door Mechanism 
R R R R R R R R R  The safety mechanism is installed parallel to and below the locking mechanism in the lower part of the cargo door. The primary task of this mechanism is to tell the operator that the locking mechanism is correctly latched. The safety mechanism includes the subsequent components: - the safety shaft which has a link rod, six safety cams with a red and green mark, two drift pin levers and a vent door lever, - the vent door mechanism which opens and closes the vent door. 
R  The link rod connects the lever mechanism with the link lever to 
R R R  transmit the movement of the locking handle to the safety shaft. The safety cams then engage with, or disengage from, the recess of the locking hooks. The engaged safety cams prevent the operation of the 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-31-00Page 34 1201-220, 1May 01/05 1 1 1CES 1 locking hooks. Then, the operator can see the green mark on each safety cam through the indication windows of the access panel. When the operator can see a red mark in the indication windows, then the safety cams are disengaged from the locking hook.
　
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