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A
747-400 MAINTENANCE MANUAL
SWITCH COVER ATTACH SCREWS
SWITCH ATTACH SCREW
A
(2 LOCATIONS)
MAIN ENTRY SWITCH
DOOR 5
COVER SEE C
A
PLUNGER MAIN ENTRY DOOR 1
SEE BCAM LATCH
SEE A FITTING
MAIN ENTRY DOOR 1
A 
CHART SWITCH ADJUSTMENT IS SHOWN ON THE BEFORE INSTALLATION THE PLUNGER LENGTH  SWITCH  FITTING CAM LATCH 

PLUNGER PLUNGER PLUNGER
SEE B
(SWITCH NOT INSTALLED)
B
B
THE PLUNGER LENGTH AFTER
INSTALLATION IS SHOWN ON
THE SWITCH ADJUSTMENT CHART
B
PLUNGER SWITCH COVERSWITCH ATTACH SCREWSCAM LATCH
COVER FITTING AFT DOOR
PLUNGER  FRAME
(SWITCH INSTALLED)  MAIN ENTRY DOOR 5
B C
Entry Door Warning Switch Installation
Figure 402 (Sheet 1)

C84776
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747-400
MAINTENANCE MANUAL

(FRONT VIEW)  (REAR VIEW)
MAIN ENTRY DOOR SWITCH
(DOOR 5)
B-B

PLUNGER LENGTH  PLUNGER LENGTH 
SWITCH  BEFORE INSTALLATION  AFTER INSTALLATION 
1(INCHES)  2(INCHES) 
ML-1329 ML-1327  0.56-0.58  0.330-0.365 

SWITCH ADJUSTMENT CHART
MEASURE THE LENGTH FROM THE OUTER FACE OF THE MOUNTING BRACKET TO THE END OF THE PLUNGER
MEASURE THE LENGTH FROM THE BOTTOM OF THE TRACK IN THE CAM LATCH FITTING TO THE END OF THE PLUNGER
THERE IS NO SEALANT APPLIED TO THE REAR OF THE SWITCH.
Entry Door Warning Switch Installation Figure 402 (Sheet 2)
C84772
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747-400 MAINTENANCE MANUAL
 (g)  Remove the switch.
 TASK 52-71-01-004-022
 5.  Switch Removal For The Forward and Aft Cargo Door Warning System (Fig. 403)________________________________________________________________
 A. General
 (1)  
The door warning systems for the forward and aft cargo doors are the same. The steps in this task are for the forward or the aft cargo door.

 B.
References

 (1)  
IPC 52-34-09 Fig. 2

 (2)  
SSM 52-71-01

 (3)  
WDM 52-71-14

 C.
Access

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

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

 D.
Procedure

 S 864-073
 (1)
Open these circuit breakers for the applicable EICAS system:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F8 UPR EICAS
 2) 7F9 EIU L
 3) 7F10 EIU C
 4) 7F14 LWR EICAS
 5) 7F15 EIU R

 S 024-003
 (2)  
Remove the door warning switch from the pressure relief door (Fig. 403).

 (a)  
Get access to the cargo compartment.

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747-400
MAINTENANCE MANUAL

SEE A FORWARD CARGO DOOR 
ESEE SEE A BULK CARGO DOOR SWITCH AFT CARGO DOOR 
PRESSURE RELIEF DOOR 
CARGO DOOR FORWARD OR AFT 
SEE B SWITCH DOOR WARNING 
　
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