F. Install Panel No. 6
(1)
Support panel No. 6 in mounting position.
(2)
Install two fasteners in each outboard attaching bracket to secure panel to overhead support structure.
(3)
Install fasteners to secure two inboard attaching brackets to support structure.
G. Install Panel No. 1
(1)
Attach lowered ceiling panel to hinges.
(2)
Connect electrical leads to speaker and call light on panel No. 1.
(3)
Hinge lowered ceiling panel up to engage the two latches.
527
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K90523
527 Forward Lowered Ceiling Installation
Aug 15/72 Figure 401 (Sheet 1) 25-21-352
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Forward Lowered Ceiling Installation 533
25-21-352 Figure 401 (Sheet 2) Feb 15/72
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533 Forward Lowered Ceiling Installation
Feb 15/72 Figure 401 (Sheet 3) 25-21-352
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Forward Lowered Ceiling Installation 533
25-21-352 Figure 401 (Sheet 4) Feb 15/72
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533 Forward Lowered Ceiling Installation
Feb 15/72 Figure 401 (Sheet 5) 25-21-352
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AFT LOWERED CEILING PANELS - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes with
Carry-All Compartment Interior
1. General
A. The aft lowered ceiling comprises individual panels as described in this section. The panels are arbitrarily numbered, as shown in Fig. 401, to assist in identification within this section only.
B. The procedure which follows describes the operations necessary to remove the entire lowered ceiling. If desired, any one lowered ceiling panel can be removed after opening appropriate access panels for access to pane attachments. In some cases adjacent lowered ceiling panels will need to be removed to allow removal of the desired panel.
C. Depending upon the passenger cabin arrangement, certain items of passenger equipment are installed under the lowered ceiling and will obstruct removal of some lowered ceiling panels.
2. Remove Aft Lowered Ceiling Panels (Fig. 401)
A. Remove Panels No. 1 or 2
(1)
Open lowered ceiling panel by releasing the two latches.
(2)
Detach lowered ceiling panel from hinges.
NOTE: All remaining equipment and fasteners in the lowered ceiling are accessible through the access door openings.
B. Remove Panel No. 9
(1)
Support panel and remove fasteners attaching panel to support brackets at each corner of panel.
(2)
Lower and remove panel No. 9.
C. Remove Panel No. 10
(1)
Remove plug buttons which conceal fasteners on lower surface of panel No. 10.
(2)
Remove fasteners at inboard edge of panel No. 10.
(3)
Hinge panel No. 10 down and detach hinges from support structure.
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D. Remove Panel No. 5 or 6
(1)
Disconnect brackets attaching trim strip on panel aft edge to fuselage structure and to sidewall extrusion.
(2)
Disconnect bracket on outboard edge from overhead support structure.
(3)
Support panel, remove fasteners at inboard and aft edges, and remove panel.
E. Remove Lowered Ceiling End Cap
(1)
Lower curved ceiling panels installed adjacent to lowered ceiling end cap (Ref 25-21-341, Maintenance Practices).
(2)
Open appropriate circuit breakers and disconnect wire bundle from emergency light and lavatory occupied lights.
(3)
Remove emergency exit light.
(4)
Remove three screws attaching each top panel to end cap support channel and remove both top panels.
(5)
Support end cap and remove fasteners attaching each outboard end to overhead support structure.
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