DOOR LATCHED SWITCH
DOOR WARNING SEE C SWITCH DOOR CLOSED
SWITCH
SEE D
FORWARD OR AFT CARGO DOOR
FWD A
DOOR WARNING SWITCH
B
Cargo Door Warning Switch Installation
Figure 403 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL
LATCH BELLCRANK
BULK CARGO DOOR SWITCH
Cargo Door Warning Switch Installation
Figure 403 (Sheet 2)
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(b)
Disconnect the wiring from the switch at the connector.
(c)
Remove the lockwire from the switch.
(d)
Remove the locknuts from the switch.
(e)
Remove the switch from the bracket.
S 014-138
(3)
Remove the door latched switch (Fig. 403).
(a)
Open the door to get access to the switch.
(b)
Disconnect the wiring from the switch.
(c)
Remove the lockwire from the switch.
(d)
Remove the locknuts from the switch.
(e)
Remove the switch from the door beam.
S 024-139
(4)
Remove the door closed switch (Fig. 403).
(a)
Open the door to get access to the switch.
(b)
Remove the wiring from the switch.
(c)
Remove the lockwire from the switch.
(d)
Remove the locknuts from the switch.
(e)
Remove the switch.
TASK 52-71-01-004-023
6. Bulk Cargo Door Warning Switch Removal (Fig. 403)
______________________________________
A. References
(1)
IPC 52-71-03 Fig. 1
(2)
SSM 52-71-01
(3)
WDM 52-71-14
B.
Access
(1)
Location Zone
146 Bulk Cargo Compartment, RH
(2)
Access Panel
823R Door - Bulk Cargo Compartment
C.
Procedure
S 864-074
(1)
Open these circuit breakers for the applicable EICAS system:
(a)
P7 Overhead Circuit Breaker Panel 1) 7F8 UPR EICAS
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2) 7F9 EIU L
3) 7F10 EIU C
4) 7F14 LWR EICAS
5) 7F15 EIU R
S 024-004
(2)
Remove the warning switch for the bulk cargo door (Fig. 403).
(a)
Open the bulk cargo door.
(b)
Release the quick-release fasteners to remove the access panel in the sidewall lining at the front of the door opening.
(c)
Remove the two screws and washers that attach the switch to the door latch.
(d)
Remove the two attach screws to remove the wires from the switch.
(e)
Put tags on the wires.
(f)
Remove the switch.
(g)
Disconnect the wiring from the switch at the splice.
TASK 52-71-01-004-028
7. Switch Removal from the Side Cargo Door Warning System (Fig. 404)______________________________________________________
A. References
(1)
IPC 52-32-15 Fig. 1
(2)
SSM 52-71-01
(3)
WDM 52-71-14
