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A 747-400 MAINTENANCE MANUAL
SEE A
SEE E
SWITCH MOUNTING
COVER BRACKET
SCREWS SLEEVE SCREW
SWITCH
(2 LOCATIONS) COVER
SWITCH COVER SEE B
SWITCH  SWITCH 
LATCH  PLUNGER  PLUNGER 
FITTING  SEE  C  SEE  D 
LATCH 
FITTING 

MAIN ENTRY DOOR 1 A
B
SET THIS DIMENSION AFTER YOU INSTALL THE SWITCH (REFER TO THE SWITCH ADJUSTMENT CHART)
SET THIS DIMENSION BEFORE SWITCH
2
YOU INSTALL THE SWITCH (REFER TO THE SWITCH ADJUSTMENT CHART)
1
LATCH SWITCH FITTING PLUNGER
SWITCH PLUNGER
D
C
1
MEASURE THIS DISTANCE FROM THE FACE 2 MEASURE THIS DISTANCE FRON THE END OF THE MOUNTING BRACKET TO THE OF THE TRACK IN THE LATCH FITTING TO END OF THE PLUNGER THE END OF THE PLUNGER
Entry Door Warning Switch Adjustment Figure 501 (Sheet 1)
D16180
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A
747-400
MAINTENANCE MANUAL

MAIN ENTRY DOOR 5

SWITCH ADJUSTMENT CHART
MEASURE THIS DISTANCE FROM THE FACE OF THE MOUNTING BRACKET TO THE END OF THE PLUNGER
MEASURE THIS DISTANCE FROM THE END OF THE TRACK IN THE LATCH FITTING TO THE END OF THE PLUNGER
Entry Door Warning Switch Adjustment Figure 501 (Sheet 2)

L03029
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A
747-400 MAINTENANCE MANUAL
 S 825-018
 (4)  
Adjust the door warning system on the forward and aft cargo compartment doors (Fig. 502).

 (a)  
Adjust the door warning switch on the forward and aft cargo doors (Detail B)

 NOTE: The door warning switch is on the pressure relief
____ door in the top half of the cargo door.
 1) Make sure the master latch lock handle is closed. 2) Measure the continuity between pins 2 and 3 on the P3 connector on the cargo door junction box. 3) Turn the bolt on the switch until there is no continuity between pins 2 and 3 on the P3 connector. 4) Turn the bolt 5 +/- 1/8 turn more.
 (b)  Adjust the door close switch (Detail D). 1) Move the adjustment bolt until the switch plunger hits the bottom of the switch. 2) Turn the adjustment bolt 3.0 +/- 1/8 turns in the opposite direction. 3) Disconnect the P3 and the P4 connector from the cargo door junction box.
 4)  Make sure there is no continuity between the appropriate connector and ground as follows: a) Pin 13 on the P4 connector or
 pin 16 on the P3 connector. 5) Connect the P3 and the P4 connector to the cargo door junction box.
 (c)  Adjust the door latched switch on the forward and aft cargo doors (Detail C). 1) Open the door to get access to the switch. 2) Use a torque wrench to manually turn the latch actuator
 clockwise. 3) Monitor the torque you use to turn the latch actuator.
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A
747-400
MAINTENANCE MANUAL

FORWARD CARGO DOOR SEE A
SEE E
AFT CARGO DOOR SEE A
DOOR CLOSED SWITCH (FORWARD CARGO DOOR)
SEE D DOOR WARNING SWITCH
SEE B
FORWARD AND 
AFT CARGO 
DOOR (REF) 
DOOR LATCHED 
SWITCH 
SEE  C 
DOOR CLOSED SWITCH 
WARNING DOOR  (AFT CARGO DOOR) 
SWITCH  SEE  D 

FWD FORWARD AND AFT CARGO DOORA
FORWARD OR AFT CARGO DOOR WARNING SWITCH
　
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