52-34-00
 ALL  ú ú 03 Page 109 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FORWARD/AFT CARGO DOOR - ADJUSTMENT/TEST
________________________________________
 1.  General_______
 A. This procedure contains three tasks:
 (1)  
The first task is an operational test of the cargo door operating mechanism.

 (2)  
The second task is the adjustment of the cargo door.

 (3)  
The third task is a system test of the cargo door operating mechanism.

 TASK 52-34-00-705-001
 2.  Operational Test - Cargo Door Operating Mechanism_________________________________________________
 A. General
 (1)  This is a check of the cargo door operation for:
 -smooth action
 -
correct engagement of the hook and latch pins

 -
correct electrical sequence of the mechanisms.

 (2)  
You can do the test with the airplane on its gear, and at an operating weight of zero.

 (3)  
For a fast check to find an unserviceable condition of the forward or aft cargo door systems refer to 52-34-00/601.

 B.
References

 (1)  
24-22-00/201, Manual Control

 (2)  
AIPC 52-34-09 Fig. 1, AIPC 52-34-09 Fig. 2

 (3)  
SSM 52-34-01, 52-35-01

 (4)  
WDM 52-34-11, 52-35-11, 52-71-01, 52-71-11

 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

 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-003

 (2)  
Make sure the applicable circuit breakers are closed:

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

 (b)  
P414 Power Distribution Center - Left 1) 414A21 LOWER CARGO DOOR FORWARD 2) 414F15 CARGO DOOR CONTROL FORWARD 3) 414F16 CARGO DOOR CONTROL AFT

 S 865-002
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-34-00
 ALL  ú ú 01 Page 501 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 715-004
 (3)  
Do the cargo door operational test as follows:

 (a)  
Release and open the master latch lock handle on the external side of the cargo door: 1) Make sure the applicable warning message shows on the EICAS

 display:
 DOOR FWD CARGO
 DOOR AFT CARGO.

 2) Make sure the pressure relief doors open. 3) Make sure the linkage operates easily.
 (b)  
Make sure the green LATCHES CLOSED light on the external door control panel comes on.

 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.

 (c)  
Put the internal or external door control switch in the OPEN position: 1) Make sure the door moves smoothly to the full open

 position. 2) Make sure all the actuators follow the correct sequence.

 (d)  
Make sure the green LATCHES CLOSED light on the external door control panel goes off.

 (e)  
Put the internal or external door control switch in the CLOSE position: 1) Make sure the door moves smoothly to the closed and latched

 position. 2) Make sure all the actuators follow the correct sequence. 3) Make sure the hooks and latch cams correctly engage with
 the hook and latch pins in the doorway.
 (f)  
Make sure the green LATCHES CLOSED light on the external door control panel comes on.

 (g)  
Lift and stow the master latch lock handle: 1) Make sure the linkage operates easily. 2) Make sure these messages are not shown on the EICAS
　
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