(2)
The installation of the junction box on the lower lobe cargo door.
TASK 52-34-05-004-001
2. Remove the Junction Box_______________________
A. References
(1)
IPC 52-34-05
(2)
SSM 52-34-01, 52-35-01
(3)
WDM 52-34-11, 52-35-11
B.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
(2)
Access Panel
821R Door - Forward Cargo Compartment
822R Door - Aft Cargo Compartment
C.
Procedure
S 014-013
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.
(1)
Open the cargo door sufficiently to get access to the cargo compartment.
S 864-003
(2)
Open these circuit breakers for the applicable cargo door and attach DO-NOT-CLOSE tags:
(a)
P59 Aft Equipment Panel
1) AFT CARGO DOOR POWER UNITS
(b)
P414 Power Distribution Center-Left
1) 414A21 LOWER CARGO DOOR FWD
2) 414F15 CARGO DOOR CONTROL FWD
3) 414F16 CARGO DOOR CONTROL AFT
S 034-004
(3)
Disconnect the connectors at the junction box receptacles as follows (Fig. 401):
(a)
Disconnect connector DM0709A on the forward door (or DM0711A on aft door) from receptacle J1.
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52-34-05
ALL ú ú 01 Page 401 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
JUNCTION BOX
SEE A
RECEPTACLE J1
RECEPTACLE J4
RECEPTACLE J3
RECEPTACLE J2
MOUNTING BOLT
(3 LOCATIONS)
FWD
JUNCTION BOX A
Cargo Door Junction Box Figure 401
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52-34-05
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b)
Disconnect connector DM0709B on the forward door (or DM0711B on aft door) from receptacle J2.
(c)
Disconnect connector P3 from receptacle J3.
(d)
Disconnect connector P4 from receptacle J4.
S 034-005
(4)
Remove the mounting screws that hold the junction box to the cargo door.
S 024-006
(5)
Remove the junction box.
TASK 52-34-05-404-007
3. Install the Junction Box
________________________
A. References
(1)
IPC 52-34-05
(2)
SSM 52-34-01, 52-35-01
(3)
WDM 52-34-11, 52-35-11
B.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
(2)
Access Panel
821R Door - Forward Cargo Compartment
822R Door - Aft Cargo Compartment
C.
Procedure
S 424-008
(1)
Install the junction box on the cargo door (Fig./401).
S 434-009
(2)
Connect the electrical connectors to the junction box receptacles Jl, J2, J3, and J4 as follows:
(a)
Connect connector DM0709A on the forward door (or DM0711A on aft door) to receptacle J1.
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