747-400 AMM 飞机维护手册 舱门 DOORS 2(6)

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This task has instructions to open the nose cargo door in the event that it is closed with an inoperative latch actuator in the latched position which cannot be unlatched electrically or manually.

 (2)  
The procedure is to remove the latch fitting that the latch actuator is attached to. Then the door is opened with the fitting attached.

 B.  
Special Tools and Equipment

 (1)  
PRE65B13015 Safety Barrier - Nose Cargo Door

 C.  
References

 (1)  
AMM 52-31-05/401, Nose Cargo Door Latch Actuator

 (2)  
AMM 52-31-06/401, Nose Cargo Door Portal Latch Actuator

 D.  
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 E.  
Procedure

 (1)  
Install the safety barrier across the door opening.

 S 932-018

 (2)  
Make a mark to show the location of the serrated plates on the latch fitting and the body frame.

 S 492-020
 NOTE: It is difficult to subsequently install the latch fitting
____ if the location is not marked clearly.
 S 032-019
 (3) Remove the bolts that hold the latch fitting to the body frame.
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A
747-400 MAINTENANCE MANUAL
 S 032-020
 (4)  
Disconnect the electrical connector from the actuator.

 S 862-021

 (5)  
Manually open the door enough to get access to the bolts that attach the latch actuator to the structure.

 S 032-022

 (6)  
Remove the bolts that attach the latch actuator and pull it from the latch fitting.

 NOTE: Be prepared to remove the latch fitting which will be
____
 free when the actuator is removed.

 S 862-023
 (7)  
Use the normal controls to open the door.

 S 432-024

 (8)  
Install the latch fitting.

 S 902-022

 (9)
Replace the inoperative latch actuator (AMM 52-31-05/401).

 F.
Put the Airplane Back To Its Ususal Condition.

 S 212-023
 (1)  
Make sure the door is fully closed, latched and locked.

 S 082-024

 (2)  
Remove the electrical power, if it is not necessary.

 S 092-025

 (3)  
Remove the safety barrier across the door opening.

 TASK 52-31-00-912-026
 5. Electrical Closure of Latch Actuators with Nose Cargo Door Open
_______________________________________________________________
 A. General
 (1)  
This task has instructions to electrically close the latch actuators while the nose cargo door is open.

 B.
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 C.
Procedure

 S 212-027
 (1)  
Make sure these circuit breakers are closed:

 (a)  
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR (115V AC)

 (b)  
On the Power Distribution Center-Right panel P415: 1) NOSE CARGO DOOR CONT (28V DC)

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 ALL  ú ú 02 Page 211 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-028
 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
On the Nose Cargo Door Power panel H122: 1) LATCHES 1-4 LEFT 2) LATCHES 1-4 RIGHT 3) LATCHES 5-8 LEFT 4) LATCHES 5-8 RIGHT 5) PULL UP CAM 6) DOOR LIFT

 S 482-029
 (3)  
Connect a jumper wire between the test point TP1 and pin G4 of terminal block TB325 and TP1 and pin X1 of mechanical interlock relay R759 in the Nose Cargo Door Power panel (Panel H122).

 S 862-030

 (4)  
Remove the DO-NOT-CLOSE tags and close these applicable circuit breakers:
　
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