MID SPAN LATCH 
OPEN SWITCH 
(AFT) 
HOOK CLOSE 
SWITCH 
MID SPAN 
LATCH OPEN 
SWITCH 
(FORWARD) 
MASTER LATCH 
LOCK SWITCH 
HOOK  DOOR CLOSE 
POSITION  SWITCH 
SWITCH 
LATCH OPEN 
SWITCH 
LATCH CLOSE 
SWITCH 
FORWARD CARGO DOOR 
Cargo Door Sequence Switches 
Figure 601 (Sheet 1) 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-34-09
 ALL  ú ú 03 Page 602 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

DOOR UP 
SWITCH 
MID SPAN LATCH 
OPEN SWITCH 
(AFT) 
HOOK CLOSE 
SWITCH 
LATCH OPEN 
SWITCH 
MID SPAN 
LATCH OPEN 
SWITCH 
(FORWARD) 
MASTER LATCH 
LOCK SWITCH 
DOOR CLOSE 
SWITCH 
LATCH CLOSE 
SWITCH 
HOOK POSITION 
SWITCH 
AFT CARGO DOOR 
Cargo Door Sequence Switches 
Figure 601 (Sheet 2) 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-34-09
 ALL  ú ú 04 Page 603 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (3)  S 866-015Disconnect the P3 connector at the cargo door junction box.
 (4)  S 766-006Do a continuity check for the hook position switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pins 7 and 11 on the P3 connector. (c) Push in on the switch plunger. (d) While you hold the plunger in, make sure there is continuity between pins 7 and 11 on the P3 connector.
 (5)  S 766-013Do a continuity check for the forward midspan latch open switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pins 13 and 8 on the P3 connector. (c) Push in on the switch plunger. (d) While you hold the plunger in, make sure there is continuity between pins 13 and 8 on the P3 connector.
 (6)  S 766-018Do a continuity check of the aft midspan latch open switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pin 13 on the P3 connector and pin 4 on the P5 connector.
 NOTE:____ The P5 connector is on the door restraint solenoid.
 (c) (d) (e)  Push in on the switch plunger.While you hold the plunger in, make sure there is continuity between pin 13 on the P3 connector and pin 4 on the P5 connector.Connect the P5 electrical connector to the door restraint solenoid.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-34-09
 ALL  ú ú 06 Page 604 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 766-021
 (7)  
Do a continuity check of the master latch lock switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is no continuity between pins 4 and 1 on the P3 connector.

 (c)  
Push in on the switch plunger.

 (d)  
While you hold the plunger in, make sure there is continuity between pins 4 and 1 on the P3 connector.

 S 216-028
 (8)  
Do a continuity check of the latch open switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is no continuity between pins 15 and 12 on the P3 connector.

 (c)  
Push in on the switch plunger.

 (d)  
While you hold the plunger in, make sure there is continuity between pins 15 and 12 on the P3 connector.

 S 426-030
 (9)  
Connect the P3 connector to the cargo door junction box.

 S 866-008
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 艙門 DOORS 3(82)