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 ALL  ú ú 02 Page 404 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 SEQUENCE SWITCHES - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)
The removal of the sequence switches from the side cargo door.

 (2)
The installation of the sequence switches on the side cargo door.

 B.  
This procedure gives instructions to remove and install the door down, door up, door closed, master latch lock, hook open, hook closed, latches open, latches closed, and midspan latch open switches.

 TASK 52-32-15-004-001
 2.  Remove the Sequence Switches____________________________
 A.  References
 (1)  
IPC 52-32-15 Fig. 1

 (2)  
SSM 52-32-01

 (3)  
WDM 52-32-21

 B.  
Access

 (1)  
Location Zone
 261 Main Deck STA 1720 To STA 2040, LH

 (2)  
Access Panels
 836L Door - Main Deck Cargo

 C.  
Prepare for removal.

 S 864-003
 (1)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers for the side cargo door:

 (a)  
P415 Power Distribution Center - Right 1) 415F17 SIDE CARGO DOOR CONT

 (b)  
P715 Aux/Ext No. 2 Power Center
 1) SIDE CARGO DOOR PWR

 S 864-016
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR AND
_______ THE DOOR OPENING WHEN YOU OPERATE THE DOOR. FAILURE OF THE LIFT MECHANISM COULD CAUSE THE DOOR TO CLOSE QUICKLY WHICH COULD CAUSE INJURY OR DAMAGE.
 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.
 (2)  
For access and adjustment of these switches, set the door as follows:

 (a)
Master latch lock switch: door not fully open.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

A
DOOR-UP SWITCH
(2 LOCATIONS)  DOOR-DOWN
SWITCH
(2 LOCATIONS)
A
MIDSPAN LATCH TORQUE TUBE
F
F
MIDSPAN LATCH-OPEN
F
SWITCHMIDSPAN LATCH-OPEN
F
SWITCH
LATCHES-
OPEN 
SWITCH 
G  E  C 
D 
B  MASTER LATCH-
LOCK SWITCH 
C 
HOOK 
B  E 
(2 LOCATIONS) SWITCH HOOK-CLOSED  D  CLOSED DOOR- G  SWITCH CLOSED LATCHES-
HOOK-OPEN  SWITCH 
SWITCH 
(2 LOCATIONS) 

Side Cargo Door Sequence Switches
Figure 401 (Sheet 1)

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 52-32-15
 ALL  ú ú 02 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

DOOR-DOWN SWITCH
DOOR-DOWN STOP
ROTARY ACTUATOR 0.20 INCH DOOR-UP SWITCH 0.040
INCHDOOR-
0.032 UP
SWITCH CLEARANCE STOP
0.071 0.063 INCH 
0.20 INCH  ARM ACTUATOR ROTARY SWITCH CLEARANCE  INBD  ROTARY ACTUATOR  ARM ACTUATOR ROTARY 
LINK 
DOOR-UP SWITCH  DOOR-DOWN SWITCH 
(ADJUSTMENT)  (ADJUSTMENT) 
A-A 
　
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