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33-46-00
ALL ú ú 01 Page 204 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
AREA LIGHT TRANSFORMER - REMOVAL/INSTALLATION
_____________________________________________
1. General_______
A. This procedure contains these tasks:
(1)
A task for the removal of the transformer for the area lights.
(2)
A task for the installation of the transformer for the area lights.
TASK 33-46-01-004-001
2. Transformer Removal (Fig. 401)___________________
A. References
(1)
24-22-00/201, Manual Control
(2)
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
(3)
25-52-04/401, Containerized Cargo Compartment Insulation
(4)
SSM 33-37-30
B. Access
(1) Location Zone
100 Lower Cargo Compartments, Interior
C. Procedure
S 864-002
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P414 Power Distribution Center Panel - Left 1) 414C25 LIGHT FWD CARGO
(b)
P59 Aft Lower Cargo Equipment Panel
1) CARGO AREA LIGHTS
(2)
Remove the adjacent sidewall lining panel (Ref 25-52-01/401).
S 014-004
(3)
Remove the sidewall insulation material that is necessary to get access to the transformer (Ref 25-52-04/401).
S 024-024
(4)
Do these steps to remove the transformer:
S 014-003
(a) Disconnect the lamp and transformer wires from the terminal block on the mounting bracket.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
AREA
LIGHT
AFT CARGO
COMPARTMENT
(REF)
FORWARD CARGO
COMPARTMENT BULK CARGO
(REF) COMPARTMENT
(REF)
AREA LIGHT
AREA LIGHT
SEE A
SIDEWALL
LINING
(EXAMPLE)
TRANSFORMER
MOUNTING LAMPPLATE WIRES
TERMINAL BLOCK
HOUSING (REF)
MOUNTING BRACKETS
AREA LIGHT
A
Area Light Transformer Installation
Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
33-46-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
Remove the screws that hold the mounting plate to the mounting brackets.
(c)
Move the mounting plate away from the mounting brackets.
(d)
Remove the screws, washers, and spacers that attach the mounting plate to the transformer.
(e)
Remove the transformer.
(f)
Remove the lamp wires through the hole in the mounting plate.
TASK 33-46-01-404-011
3. Transformer Installation (Fig. 401)________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Lining
(3)
25-52-04/401, Containerized Cargo Compartment Insulation
(4)
SSM 33-37-30
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