S 034-005
(4)
Loosen the other screw to isolate the external transformer bracket from the fault current detector until you can remove the wire from in the transformer.
S 034-006
(5)
Remove the screws and washers (2 locations) that attach the fault current detector to the mounting bracket (View A).
(6)
Remove the fault current detector.
S 024-007
TASK 28-31-14-404-008
3. Fault Current Detector Installation (Fig. 401)___________________________________
A. References
(1)
AMM 28-31-14/501, Fault Current Detector
(2)
AIPC 28-31-60 Fig. 1
(3)
SSM 28-31-02, SSM 28-31-04
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A
747-400
MAINTENANCE MANUAL
FAULT CURRENT DETECTOR FOR THE FUEL OVERRIDE/ JETTISION PUMP
SEE A
MOUNTING BRACKET
FAULT CURRENT
DETECTOR
TRANSFORMER
BRACKET
WASHER
SEE B
(2 LOCATIONS) SCREW
(2 LOCATIONS)
FAULT CURRENT DETECTOR FOR THE FUEL OVERRIDE/JETTISON PUMP
A
CLEARANCE TO
REMOVE WIRE
SCREW (2 LOCATIONS)
TRANSFORMER TRANSFORMER BRACKET BRACKET
B
Fault Current Detector for the Fuel Override/Jettison Pump Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(4)
WDM 28-31-21, WDM 28-31-22, WDM 28-31-23, WDM 28-31-24,
WDM 28-31-25, WDM 28-31-26
B.
Access
(1)
Location Zones
117 Electrical & Electronics Compartment, Left
118 Electrical & Electronics Compartment, Right
C.
Procedure
S 034-009
(1)
If the external transformer bracket is attached to the fault current detector, do the steps that follow:
(a)
Remove the screw nearest to the front of the fault current detector which attaches the external transformer bracket to the fault current detector (View A).
(b)
Loosen the other screw to isolate the external transformer bracket from the fault current detector until you can put the wire in the external transformer.
S 434-010
(2)
Put the external transformer around the airplane wiring (View B).
S 434-011
(3)
Install the front screw that attaches the external transformer bracket to the fault current detector.
(4)
Tighten the two screws to 6 pound-inches.
S 424-012
(5)
Hold the fault current detector in its position on the mounting bracket (View A).
S 434-013
(6)
Install the screws (2 locations) that attach the fault current detector to the mounting bracket.
S 434-016
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A
747-400 MAINTENANCE MANUAL
S 434-014
(7) Connect the electrical connector to the fault current detector.
NOTE: Refer to this table for the equipment numbers.
____
~................................................................. | | Equipment Number | | Location ............................ | | Detector | Connector | ................................................................... | No. 2 Main Tank - Inbd (Aft) | M7867 | DM7867 | | No. 2 Main Tank - Outbd (Fwd) | M7869 | DM7869 | | No. 3 Main Tank - Inbd (Aft) | M7866 | DM7866 | | No. 3 Main Tank - Outbd (Fwd) | M7868 | DM7868 | | Center Wing Tank - Left | M473 | DM473 | | Center Wing Tank - Right | M472 | DM472 | 2......................................…...........…..............1
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