52-34-12
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747-400 MAINTENANCE MANUAL
 S 862-031
 CAUTION: THE HANDLE MAY BE HARD TO CLOSE IF THE LATCH CAMS ARE
_______ NOT FULLY CLOSED. LOOK AT THE LATCH ALIGNMENT STRIPES TO MAKE SURE THE LATCH CAMS ARE FULLY CLOSED. DO NOT USE TOO MUCH FORCE TO CLOSE THE HANDLE. YOU CAN BREAK THE RIVET AGAIN IF YOU USE TOO MUCH FORCE TO CLOSE THE HANDLE.
 (7)  Close the handle.
 TASK 52-34-12-202-032
 6. Master Latch Lock Mechanism - Inspection/Check (Fig.______________________________________________201)
 A. General
 (1)
This task refers to the master latch lock handle as "the handle".

 B.
References

 (1)  
IPC 52-34-12

 (2)  
AMM 52-34-00/601

 (3)  
AMM 52-34-01/601

 (4)  
AMM 52-34-00/501

 C.
Access

 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

 (2)  
Access Panels
 821R Door - Forward Cargo Compartment
 822R Door - Aft Cargo Compartment

 D.
Procedure

 (1)  
Push the trigger to open the handle.

 S 212-034

 (2)  
Examine the master latch lock handle and trigger for damage, corrosion, and wear (AMM 52-34-01/601).

 S 212-035

 (3)  
Examine the lock sectors, torque tubes, pushrods, and other components of the master latch lock mechanism for damage, corrosion, and wear (AMM 52-34-01/601).

 S 862-033
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 747-400 MAINTENANCE MANUAL
 (4)  S 212-049Make sure the torque tubes, pushrods, and other components are correctly attached (AMM 52-34-00/501).
 (5)  S 212-050Do a check of the force needed to push the master latch lock handle to a closed position (AMM 52-34-00/601).
 (6)  S 412-036Close the handle.

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747-400 MAINTENANCE MANUAL
 HOOK RETURN SPRING - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A. This procedure contains two tasks:
 (1)  
The first task is the removal of the hook return spring from the lower lobe cargo doors.

 (2)  
The second task is the installation of the hook return spring on the lower lobe cargo door.

 TASK 52-34-20-004-001
 2.  Hook Return Spring - Removal____________________________
 A. General
 (1)  
The hook return springs are installed on the cargo door adjacent to the hook mechanism bellcranks. This procedure is for the forward lower lobe cargo door. The aft lower lobe cargo door is almost the same.

 B.
References

 (1)  
IPC 52-34-07

 C.
Access

 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

 (2)  
Access Panel
 821R Door - Forward Cargo Compartment
 822R Door - Aft Cargo Compartment

 D.
Procedure

 S 014-020
 CAUTION:_______IN CASE THE DOOR DOES NOT OPEN, STOP IMMEDIATELY. DO NOT OPERATE THE DOOR CONTROL SWITCH. HOLDING THE DOOR CONTROL SWITCH MAY DAMAGE THE ACTUATOR. WAIT AT LEAST 1 MINUTE BEFORE SECOND ATTEMPT. IF THE DOOR STILL DOES NOT OPEN, WAIT AT LEAST 10 MINUTES BEFORE THIRD ATTEMPT.
　
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