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the drift pin levers move up and operate the teleflex controls. The ends of these controls extend and move the bellcranks which operate the connection links. The drift pins retract from the pockets of the fuselage frames,
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the vent door lever operates the connection rod which turns the drive shaft of the gear box. The output shaft of the gear box turns also and moves the drawbar which opens the vent door. The drive shaft operates the link assy at the same time so that the target lever moves away from the door sill. The related target does not operate the proximity switch 32WV (Ref. 52-71-00).
1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-32-00Page 67 1201-220, 1Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 221-299, 301-399, 401-499,
A. Release Mode
To release the cargo door mechanism, pull the door handle away from the cargo door. To get access to the door handle, the operator pushes the spring-loaded handle flap automatically inboard. This releases the door handle from the catch hook of the door structure.
When the door handle is pulled up to the 65 degree position, the subsequent occurs:
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the door handle engages with the Maltese-cross lock to operate the linkage mechanism. Its control rod then turns the locking shaft so that the lock cams move away from the recess of the latching hooks,
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the drift pin lever moves up and operates the linkage mechanism. The control rods transmit the movement through the housing assy and the bearing assy to the connection rods. They move the drift pins which retract from the pockets of the fuselage frames, at the same time the vent door mechanism causes the vent door to open.
-The drive shaft operates the link assy at the same time so that the target lever moves away from the door sill. The related target does not operate the proximity switch 32WV (Ref. 52-71-00).
R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
To disengage the latching hooks from their fuselage fittings, lift the door handle up to the 128 degree position. During this movement, the subsequent occurs:
-
the door handle disengages from the Maltese-cross lock and engages with the Maltese-cross latch. This causes the latching shaft to turn in the release direction.
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the shaft levers operate the bellcranks which move the bellcrank levers so that the locking hooks disengage from the eccentric bolts of the fuselage fittings,
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the control lever moves the target to the proximity sensor 12MJ which sends a signal to the door control circuit (Ref. 52-35-00),
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the interlock cam moves up so that the released interlock mechanism is serviceable.
When the cargo door opens, the roller lever of the interlock mechanism moves away from the interlock fitting of the door sill. The spring unit extends and moves the interlock lever so that its stop bolt touches the interlock cam. This causes the interlock mechanism to block the operation of the door handle which is in the UNLATCHED position.
1EFF : 001-049, 053-099, 101-149, 151-199, 1 52-32-00Page 68 1201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1 B. Locking Mode
When the cargo door closes, the roller lever of the interlock mechanism moves against the interlock fitting of the door sill. The roller lever then operates the connection rod which moves the interlock lever against the spring unit. If the cargo door is fully closed, the subsequent occurs:
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the stop bolt of the interlock lever does not block the cam of the locking shaft,
-
the door handle is serviceable to lock the closed cargo door.
To engage the latching hooks on their fuselage fittings, pull the door handle down to the 65 degree position. During this movement the subsequent occurs:
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the Maltese-cross latch operates the connection rod which turns the latching shaft in the latched position,
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the shaft levers operate the bellcranks which move the bellcrank levers. The latching hooks engage the eccentric bolt of the fuselage fitting.
-
the control lever turns the related target away from the proximity sensor 12MJ to stop the hydraulic operation (Ref. 52-35-00),
-
the interlock cam comes to its unblocked position.
**ON A/C 051-052,
To disengage the locking hooks from their fuselage fittings, turn the locking handle down into its UNLOCKED position. During this movement, the subsequent occurs:
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