-
the handle spring keeps the door handle in the overcenter position,

 -
the drift pin lever moves down and operates the linkage mechanism. The vertical control rods 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.

 -
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 30WV (Ref. 52-71-00). When the door handle is in line with the cargo door contour, the target operates the proximity switch 28WV . This causes the visual warning in 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:
 -
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,

 -
the drift pin levers move down and operate the teleflex controls. The ends of these controls retract and move the bellcranks which operate

 1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-31-00Page 48 1201-220, 1Aug 01/05R 1 1 1CES 1

 the connection links. The drift pins extend into the pockets of the
 fuselage frame,
 -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 30WV (Ref.52-71-00).
 When the locking handle is in line with the cargo door contour, the target operates the proximity switch 28WV. This causes the visual warning in the cockpit to go off (Ref. 52-71-00). In this position, the hook of the flap mechanism safeties the locking handle against movement.
R **ON A/C 106-149, 221-299, 301-399, 401-499,
 When the door handle is moved down and pushed inboard so that it is in line with the cargo door contour, the subsequent occurs:
 -
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.

 -
the handle spring keeps the door handle in the overcenter position.

 -
the vent door lever moves down and operates the connection rod. The sequence shaft transmits the movement through the input bellcrank and the drift pin bellcrank to the horizontal linkages. They move the drift pins which extend into the pockets of the fuselage frame.

 -
the vent door bellcrank operates the vent door rod which closes the vent door.

 The sequence 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 the cockpit to go off (Ref. 52-71-00). In this position, the hook of the door structure safeties the door handle against movement.
R 1EFF : 051-052, 106-149, 221-299, 301-399, 1 52-31-00Page 49 1401-499, 1Aug 01/05 1 1 1CES 1 1EFF : ALL 1 52-31-00Page 401 1 1 May 01/05 1 1 1CES 1

 FWD CARGO COMPARTMENT DOOR - DEACTIVATION/REACTIVATION______________________________________________________ 
R  **ON A/C 051-052, 
R  TASK 52-31-00-040-002 
R  Deactivation of the Locking Handle 
R  1. Reason for the Job__________________ 
R  Refer to the CDL TASK: 52-8 
R  Cargo door opening system 
R  Handle of cargo door 
R  2. Job Set-up Information______________________ 
R  A. Consumable Materials 
R  -------------------------------------------------------------------------------
R  REFERENCE DESIGNATION 
R  -------------------------------------------------------------------------------
R  Material No. 08-061 USA MIL-T-4053 
R  TAPE SOUND DAMPENINGALUMINIUM FOIL (Ref. 20-31-00) 
　
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