E.  Install floor pan.
(1)  
Clean floor and bottom of pan thoroughly with solvent.

(2)  
Apply double-backed tape to floor, do not overlap tape.

(3)  
Install pan and press down on tape.

(4)  
Install trim strips and fasteners around periphery.

(5)  
Install threshold and secure in place.

(6)  
Apply sealant.

(a)  
Lightly sand any enamel to be covered by sealant.

(b)  
Apply bead of BMS 5-95 sealant to all cracks, small openings and internal corners.

(c)  
If desired, coat sealed area with BMS 5-108 type 1 class B coating to thickness of

0.002 to 0.003 inch.
F.  Install toilet shrouds.
(1)  
On airplanes so equipped, position seal support channel between toilet tank (lower) shroud support angles.

(2)  
Position toilet tank (lower) shroud and install screws in both ends.

(3)  
Place toilet back (upper) shroud near installed position and connect flush timer electrical connectors.

(4)  
Insert outboard corner into spring clip and install screws at both ends of shroud.

6.  Restore Airplane to Normal
A.  Install doors and headers (Ref 25-40-7).
B.  Install lavatory ceiling panel (Ref 25-0-9).
C.  Install stowage closet (Ref 25-24-381).
D.  Install galley (Ref 25-31-61).
E.  Install lowered ceiling panels removed for access (Ref 25-21-361).
F.  Close LAV FLUSH MOTOR circuit breaker on P18 panel.
536 
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AFT LAVATORY CEILING PANEL - REMOVAL/INSTALLATION
1.  General
A.  Aft lavatory ceiling panel is secured to support-brackets attached to the lavatory partition (forward wall) soffit, and to the door header.
B.  On ALL EXCEPT airplanes with ATI interior, oxygen mask box installed in the ceiling panel must be disconnected before the panel is completely removed. Partially lowering the ceiling panel and disconnecting the service unit oxygen line, precludes opening the service unit and disturbing the oxygen masks.
2.  Remove Ceiling Panel (Fig. 401)
A.  Open lavatory dome light circuit breaker on circuit breaker panel P18.
B.  Remove snap-in plug buttons and remove panel attachment screws.
C.  Lower panel until access to electrical wiring and oxygen line (if appropriate) can be
accomplished.

D.  Attach connection information tags and disconnect electrical wiring from light.
E.  On ALL EXCEPT airplanes with ATI interior, disconnect oxygen line from service unit and install caps on oxygen line and unit fitting. Tighten caps finger-tight from 7 to 10 pound-inches torque.
F.  Remove ceiling panel.
G.  If ceiling panel is to be replaced, remove service unit and dome light and retain in safe place.
3.  Install Ceiling Panel (Fig. 401)
A.  If required, install service unit and dome light in ceiling panel.
B.  Position and temporarily secure panel to accomplish the following steps C thru G.
C.  On ALL EXCEPT airplanes with ATI interiors,
(1)  Remove caps from oxygen connections and connect oxygen supply line to service unit connector.
5C8 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  25-40-9 Page 401 

Aft Lavatory Ceiling Panel Installation  5C8 
25-40-9  Figure 401  Jun 20/85 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  On ATI Interior, torque oxygen connection and test connection for leaks (Ref Chapter 35, Passenger Oxygen System).
CAUTION:  HOLD OXYGEN INLET FITTING WITH WRENCH WHEN TORQUING LINE FITTING. TORQUE MUST NOT EXCEED 135 POUND-INCHES. EXCESSIVE TORQUE MAY DAMAGE CONNECTION THREADS.
E.  Connect dome light electrical wiring and remove connection information tags.
F.  Provide electrical power.
G.  Close lavatory dome light circuit breaker on panel P18.
H.  Check that lavatory dome light is illuminated.
I.  Remove temporary ties, position panel and install panel-attachment screws.
J.  Install snap-in plug buttons.
K.  If no longer required, remove electrical power.
Jun 20/87 25-40-9 Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

TOILET BACK SHROUD - REMOVAL/INSTALLATION
1. Remove Toilet Back Shroud (Fig. 401)
A. Remove lower portion of shroud for access to fasteners.
　
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