(2) 
 Access Panels
1104 Forward Toilet Panel
1502 Toilet Service Door
3105R Forward Nose Wheel Well Panel

D.  Procedure
(1)  
Service the applicable toilet tank (AMM 12-17-0).

NOTE: Keep the drain hose connected to the drain outlet.

(2)  
Accomplish the following steps to drain the precharge:.

(a)  
Open the toilet tank drain valve.

(b)  
Disconnect the drain hose from the service panel.

(3)  
Perform these steps for the applicable service panel drain valve cap:

(a)  For the Forward drain valve cap (Fig. 201, Sheet 2): 1) Remove and discard the inner door preformed packing. 2) Apply a thin layer of lubricant to the surface of the packing and install it on the
inner door. 3) Remove and discard the seal on the outer cap. 4) Apply a thin layer of lubricant to the surface of the seal and install it on the outer
cap. 5) Remove the eight mounting bolts on the ring. 6) Remove the cradle. 7) Install two mounting bolts, but do not tighten the bolts.
NOTE: This will keep the ring in place.
8) Remove and discard the preformed packing in the base assembly. 9) Apply a thin layer of lubricant on the preformed packing and install it in the base assembly. 10) Remove the two mounting bolts and install the ring with the eight mounting bolts.
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(b)  For the Aft drain valve cap (Fig. 201, Sheet 3): 1) Remove and discard the outer cap assembly seal. 2) Apply a thin layer of lubricant to the surface of the seal and install it on the outer
cap. 3) Remove the eight mounting bolts on the drain nipple assembly. 4) Remove the nipple assembly. 5) Install two mounting bolts, but do not tighten the bolts.
NOTE: This will keep the end nipple in place.
6)  Remove and discard the flange O-ring.
7)  Apply a thin layer of lubricant to the flange O-ring and install it on the drain nipple assembly.
8)  Install the eight mounting bolts on the drain nipple assembly.
E.  Return the Airplane to Its Usual Condition
(1)  
Accomplish the leak check for the appropriate service panel drain valve (AMM 38-32-0).

(2)  
Add the chemical precharge to the waste tank and accomplish the remaining steps of the toilet servicing procedure (AMM 12-17-0).

509 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  38-32-81 Page 207 

WASTE TANK DRAIN DUCT NIPPLE - REMOVAL/INSTALLATION
1. General
A.  There are two waste tank drain duct nipples on each airplane. They are located at each of the waste tank service panels. They are covered by the cap assembly during flight.
2.  Materials
A.  Sealant - Chromate Type, BMS 5-95 (Ref 20-30-11)
B.  Solvent - Spec TT-M-261 or JIS-K-8903 methyl-ethyl-ketone (Ref 20-30-31)
C.  Tape - Teflon, Permacel P-424 (Ref 20-30-51)
3.  Prepare for Removal
A.  Provide electrical power (Ref 24-22-00).
B.  Service applicable waste tank (Ref 12-17-00). Do not add flushing chemical to waste tank. Leave service door open.
C.  Open the following applicable circuit breaker on the P18 load control center. Install DO-NOT-CLOSE identifier.
(1)  DRAIN HEATER
4.  Remove Drain Nipple
A.  For forward service panel, remove aft access door on right inner wall of nose wheel well to access clamp securing drain duct to nipple.
B.  For aft service panel, remove aft cargo compartment aft bulkhead lining panel.
C.  Remove clamp securing waste drain duct to drain nipple.
D.  Pull down on waste drain cap handle and open cap.
E.  Remove mounting bolts from drain nipple (8 places).
(1)  
Remove 7 bolts leaving one bolt attached loosely.

(2)  
Hold onto nut ring from behind service panel to prevent its loss.

(3)  
Remove remaining bolt and nut ring.

F.  Remove drain nipple from service panel, using care not to damage heater gasket.
5.  Install Drain Nipple (Fig. 401)
A.  Clean mounting surfaces and bolts with solvent. Remove old sealant from bolts.
B.  If heater gasket is damaged, replace heater gasket (Ref 30-71-21).
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Waste Tank Drain Nipple Installation  500 
　
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