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the shaft levers operate the spring units to release the overcenter position of the locking units . Then the bellcranks move the bellcrank levers and the latching 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 can be 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 locking handle which is in the UNLOCKED position.
1EFF : ALL 1 52-32-00Page 69 1 1 Aug 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,
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the locking handle is serviceable to lock the cargo door.
To engage the locking hooks on their fuselage fittings, turn the locking handle up to the LOCKED position. During this movement the subsequent occurs:
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the link rod operates the deflection unit which turns the locking shaft in the locked position,
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the shaft levers operate the spring units so that the bellcranks move the bellcrank levers. The locking hooks engage the eccentric bolt of the fuselage fitting. The spring units come in the overcenter position and secure the locking hooks in their positions,
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the control lever turns the related target away from the proximity sensor 12MJ to stop the hydraulic operation (Ref. 52-35-00),
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the interlock cam comes to its unblocked position.
**ON A/C 001-049, 053-099, 101-105, 151-199, 201-220,
When the door handle is moved down and pushed inboard so that it is in line with the cargo door contour, the subsequent occurs:
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the door handle disengages from the Maltese-cross latch and engages with the Maltese-cross lock. This causes the control rod to operate and the latching shaft turns so that the safety cams move into the recess of the latching hooks.
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the handle spring keeps the door handle in the overcenter position,
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the drift pin lever moves down and operates the linkage mechanism. The vertical control transmit the movement via the housing assy and the bearing assy to the horizontal linkages. They move the drift pins which extends into the pockets of the fuselage frame.
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the vent door lever operates the connection rod which turns the drive shaft of the gear box. The output shaft turns and moves the draw bar which closes the vent door.
The drive shaft operates the link assy at the same time so that the target lever moves to the door sill. The related target operates the proximity switch 32WV (Ref. 52-71-00). When the door handle is in line with the cargo door contour, the target operates the proximity switch 34WV . This causes the visual warning in
1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-32-00Page 70 1201-220, 1Aug 01/05 1 1 1CES 1 the cockpit to go off (Ref. 52-71-00). In this position, the hook of the door structure safeties the door handle against movement.
**ON A/C 051-052,
When the locking handle is in the LOCKED position, push it inboards so that it comes in line with the cargo door contour. During this movement the subsequent occurs:
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the lever mechanism operates the link rod which turns the link lever. The safety shaft turns and the safety cams move into the recess of the locking hooks. Then, the green mark on each safety cam comes in view trough the indication windows. The handle spring keeps the lever mechanism in the overcenter position,
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the drift pin levers move down and operate the teleflex controls. The ends of these controls retract and move the bellcranks which operate the connection links. The drift pins extend into the pockets of the fuselage frame,
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the vent door lever operates the connection rod which turns the drive shaft of the gear box. The output shaft turns and moves the draw bar which closes the vent door.
The drive shaft operates the link assy at the same time so that the target lever moves to the door sill. The related target operates the proximity switch 32WV (Ref.52-71-00).
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