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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 panel 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 Forward Lowered Ceiling Panels (See figure 401)
A.  Remove Panel No. 1
(1)  
Open lowered ceiling panel by releasing the two latches.

(2)  
Open appropriate circuit breakers and disconnect electrical leads to speaker and call light on panel No. 1.

(3)  
Detach lowered ceiling panel from hinge.

B.  Remove Panel No. 6
(1)  
Support panel No. 6 and remove fasteners securing two inboard attaching brackets to support structure.

(2)  
Remove two fasteners securing each outboard attaching bracket to overhead support structure.

(3)  
Lower and remove panel No. 6.

Feb 15/72 25-21-352 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

C.  Remove Lowered Ceiling End Cap
(1)  
Lower curved ceiling panels installed adjacent to lowered ceiling end cap. Refer to 25-21-341, Curved Ceiling Panel - Maintenance Practices.

(2)  
Disconnect fabric fire barrier installed above ceiling panels by separating halves of velcro tape securing barrier to end cap.

(3)  
Open appropriate circuit breakers and disconnect wire bundle from emergency light.

(4)  
Remove two screws securing exit light to brackets on center panel and remove light.

(5)  
Remove eight screws attaching center panel of end cap to brackets on outboard panels.

(6)  
Remove fastener connecting left side outboard panel to panel No. 2.

(7)  
Remove two screws attaching support brackets to structure near inboard edge of each outboard panel.

(8)  
Support each outboard panel of end cap and remove fasteners securing outboard attaching brackets to overhead support structure.

(9)  
Move outboard panel outboard until inboard edge is free of air conditioning outlet nozzle.

(10)
Lower inboard edge and move panel inboard to remove.

D.  Remove Panel No. 2
(1)  
Remove forward service panel cover over forward entry door.

(a)  
Remove quick-release fasteners in upper corners of service panel cover.

(b)  
Remove screws attaching service panel cover to hinges at bottom corners of panel.

 

(2)  
Remove forward airstair controls.

(a)  
Open circuit breaker to forward airstair controls on circuit breaker panel P6.

(b)  
Remove two screws attaching faceplate to controls casing and pull faceplate with attachments inboard through cutout in lowered ceiling panel.

(c)  
Disconnect wiring as required and completely remove airstair controls.

(d)  
Remove screws attaching controls casing to frame structure and remove casing.

 

(3)  
Remove fasteners at inboard edge of panel No. 2.

(4)  
Pull panel No. 2 inboard to release outboard edge and then aft to release forward edge.

527 
25-21-352 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/72 

E.  Remove Panel No. 3
(1)  
Remove exit light lens over forward service door.

(2)  
Remove forward galley No. 2 or forward right windscreen, as applicable. Refer to 25-31-51, Forward Galleys Removal/Installation, or 25-24-123, Forward Right Windscreen -Removal/Installation.

(3)  
Loosen hose clamp on exhaust air hose and disconnect hose from forward galley exhaust air inlet.

(4)  
Remove fasteners at inboard edge of panel.

(5)  
Pull panel inboard and aft to release outboard and forward edges.

F.  Remove Panel No. 4 (See figure 401.)
(1)  
open access door in panel No. 4.

(2)  
Remove screws attaching clip to aft left corner of panel No. 4.

(3)  
Remove screws attaching trim strip to right side of the aft edge of panel No. 4.

(4)  
Reach through access door opening and remove screws attaching support bracket to panel on right side of panel.

(5)  
Remove fasteners through support brackets along left edge and in forward corners of panel.
　
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