NOTE:____Let the cut electrical leads stay where they are. This will help you to find the splice. Remove them when you make a splice with the new leads.
 S 034-004
 (4)  
Loosen the velcro which holds the blanket heater tight on the applicable drain tube or drain valve.

 (5)  
Remove the blanket heater from the drain tube or the drain valve.

 S 024-005
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747-400
MAINTENANCE MANUAL

WASTE TANKSSEE A
DRAIN VALVE HEATER BLANKET
DRAIN TUBE HEATER BLANKET
SERVICE PANELFWD
TUBE HEATER BLANKET
WASTE TANK 
____NOTE:  RIGHT SIDE OPPOSITE. LEFT SIDE SHOWN,  A  SERVICE PANEL 

Waste Tank Drain Heater Blanket Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 TASK 30-71-04-404-012
 3. Waste Tank Drain Blanket Heater Installation (Fig. 401)
____________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 30-71-00/501, Water and Drain Line Heaters

 (3)  
AIPC 30-71-01, Fig. 1

 (4)  
SSM 30-71-04

 (5)  
SWPM 20-30-12 (Standard Wiring Practices)

 (6)  
WDM 30-71-16

 B. Access
 (1)  Location Zone
 147,148 Area below Bulk Cargo Compartment -Waste Tank Service Panel
 C. Procedure
 S 424-006
 (1)  
Install the heater blanket around the applicable drain tube or drain valve.

 S 434-007

 (2)  
Make the heater blanket tight around the drain tube or drain valve with the attached velcro.

 NOTE: The heater blanket installed on the drain valve must permit
____ the valve handle to operate freely.
 S 034-008
 (3)  
Make a splice of the electrical leads (SWPM 20-30-12).

 S 864-009

 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P84, Aft Center Miscellaneous Circuit Breaker Panel 1) LEFT WASTE TANK HEATERS 2) RIGHT WASTE TANK HEATERS
 S 714-014
 (5)  Do a test of the heater blanket.
 (a)  Supply electrical power (AMM 24-22-00/201).
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 (b) (c)  Do a test of the heater blanket for the waste tank drain (AMM 30-71-00/501).Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 WASTE TANK DRAIN FITTING GASKET HEATER - REMOVAL/INSTALLATION
_____________________________________________________________
 1.  General_______
 A.  This subject has two tasks, one for the removal and one for the installation of the waste tank drain fitting gasket heater. In this procedure, you will remove the drain cap, cut the gasket heater wires, remove the heater, and install a replacement unit.
　
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