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 a linkage mechanism which includes the connection rods, the control rods, the bearing assy, the housing assy.
 The linkage mechanism transmit the movement of the locking shaft to the drift pins which retract or extent them. When the cargo door is correctly locked, the extended drift pins engage with the pockets of the fuselage frame.
 **ON A/C 051-052,
 (3) Safety Mechanism with Vent Door Mechanism
 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.

 The link rod connects the lever mechanism with the link lever to 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 locking hooks. Then, the operator can see the green mark on each safety cam through the indication windows of the access panel. When
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-32-00Page 54 1201-220, 1Aug 01/05 1 1 1CES 1 the operator can see a red mark in the indication windows, then the safety cams are disengaged from the locking hook.

 A connection rod transmits the movement of the safety 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 includes the teleflex controls and the drift pins with the related bellcranks and the connection links.
 The teleflex controls transmit the movement of the safety shaft to the bellcranks. They operate the connection links which retract or extent the drift pins. When the cargo door is correctly locked, the extended drift pins engage with the pockets of the fuselage frame.

R **ON A/C 106-149, 221-299, 301-399, 401-499,
 (3) Locking 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 vent door lever, a connection rod and a sequence shaft,

 -
the linkage mechanism which includes the control rod, the serrated shaft 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 safety cam through the indication windows of the access panel. When the operator can see a red mark in the indication windows, then the lock cams are disengaged from the latching hook.
 The vent door lever transmits the movement of the locking shaft through the sequence shaft to the input bellcrank. The connection rod operates the linkage of the drift pins and the vent door.
R 1EFF : 051-052, 106-149, 221-299, 301-399, 1 52-32-00Page 55 1401-499, 1Aug 01/05 1 1 1CES 1 (4) Drift Pin Mechanism with Vent Door 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 a linkage mechanism which includes the connection rods, the control rods, the drift pin bellcrank and the input bellcrank.
 The linkage mechanism transmits the movement of the locking shaft to the drift pins which retract or extend them. When the cargo door is correctly locked, the extended drift pins engage with the pockets of the fuselage frame.
 The vent door mechanism causes the vent door to open or close in accordance to the position of the drift pins.
　
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