WASTE TANK CLOSED
DRAIN NIPPLE LEVER

MOUNTING BOLT (8 LOCATIONS) 
FWD  WASTE TANK SERVICE PANEL (EXAMPLE)  OPEN LEVER 

A  1  DRAIN CAP FOR THE WASTE TANK 
1  AIRPLANES WITH OPEN AND CLOSED LEVERS  THE WASTE TANK DRAIN CAP FOR 
2  AIRPLANES WITH PUSH-TO-OPEN LEVER  B 

Waste Tank Drain Nipple Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 (2)  Access Panels
 1104 Forward Toilet Panel
 1502 Toilet Service Door
 3105R Forward Nose Wheel Well Panel

 D.  Install the Drain Nipple
 S 164-009
 (1)  Use the solvent, Series 95 (AMM 20-30-95/201) to clean the mounting surfaces and the bolts.
 (a)  Remove the used sealant from the bolts.
 S 034-010
 (2)  If the heater gasket was removed, do these steps to install a new heater gasket:
 (a)  
Remove the used wires.

 (b)  
Splice in the new wires.

 (c)  
Put the heater gasket in the correct position.

 (d)  
Make sure the wires are installed correctly.

 S 424-011
 (3)  Engage the drain nipple with the waste duct.
 (a)  Do these steps to install the drain nipple against the heater gasket: 1) At the service panels with the OPEN/CLOSE levers, install
 the drain nipple with the levers in the up position.
 2)  On airplanes with the PUSH-TO-OPEN levers for the flapper valve, do these steps: a) At the forward service panel, install the drain nipple
 with the PUSH-TO-OPEN lever in the aft and up position. b) At the aft service panel, install the drain nipple with the PUSH-TO-OPEN lever in the forward position.
 S 434-012
 (4)  Install the mounting bolts.
 (a) Install the nut ring from behind the service panel.
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A 737-300/400/500MAINTENANCE MANUAL
 (b)  
Put the bolts in the sealant momentarily.

 (c)  
Install the bolts while the sealant is wet.

 S 434-013
 (5)  Install the clamp to hold the waste drain duct to the drain nipple.
 NOTE: Wind teflon tape a minimum of one time around the clamp point
____ of the waste drain duct to make the installation easier. Remove the used teflon tape if it is necessary.
 S 414-014
 (6)  
For the forward service panel, install the access door on the right inner wall of the nose wheel well.

 S 414-015

 (7)  
For the aft service panel, install the aft bulkhead lining panel in the aft cargo compartment.

 S 794-023

 (8)  
Make sure there are no leaks at the service panel when the drain tube is filled with water (AMM 38-32-00/501).

 E. Put the Airplane to Its Usual Condition
 S 614-017
 (1)
Add the chemical precharge to the waste tank and do the remaining steps of the toilet servicing procedure (AMM 12-17-00/301).

 S 864-019

 (2)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the load control center panel, P18:

 (a)  DRAIN HEATER
 S 864-022
 (3)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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