GRAY WATER DRAIN LINE HEATER - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) Gray Water Drain Line Heater Removal
(2) Gray Water Drain Line Heater Installation
TASK 30-71-02-000-801
2. Gray Water Drain Line Heater Removal
(Figure 401)
A. General
(1) This task gives instructions to remove the Gray Water Drain Line Heater.
(2) A heated drain hose prevents water flowing to the forward drain mast from freezing. The
heated hose is under a floor panel in the forward cargo compartment. A thermostat controls the
power to the heater and is near the heated drain hose.
B. References
Reference Title
25-52-17-000-801 Forward Cargo Compartment Aft Bulkhead Liner - Removal
(P/B 401)
WDM 30-71-12 Wiring Diagram Manual
C. Location Zones
Zone Area
122 Forward Cargo Compartment - Right
D. Access Panels
Number Name/Location
192CR ECS Access Door
821 Forward Cargo Door
E. Prepare for the Removal
SUBTASK 30-71-02-860-004
(1) Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-3
Row Col Number Name
E 3 C00234 HEATERS DRAIN MAST GND
E 4 C00700 HEATERS DRAIN MAST AIR
SUBTASK 30-71-02-010-003
(2) Open this access panel:
Number Name/Location
821 Forward Cargo Door
SUBTASK 30-71-02-010-004
(3) Remove the aft bulkhead liner from the forward cargo compartment. To remove the liner, do
this task: Forward Cargo Compartment Aft Bulkhead Liner - Removal,
TASK 25-52-17-000-801.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-71-02
Page 401
D633A101-ILF Oct 15/2014
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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