TASK 30-71-02-400-801
3. Gray Water Drain Line Heater Installation
(Figure 401)
A. General
(1) This task gives instructions to install the Gray Water Drain Line Heater.
B. References
Reference Title
25-52-17-400-801 Forward Cargo Compartment Aft Bulkhead Liner - Installation
(P/B 401)
C. Consumable Materials
Reference Description Specification
G01012 Compound - Carbon Dioxide, Solid (Dry Ice -
Any Commercial Grade)
G02319 Spray - Freeze - Miller-Stephenson MS-242N
G02320 Ice - Crushed
D. Location Zones
Zone Area
122 Forward Cargo Compartment - Right
E. Access Panels
Number Name/Location
192CR ECS Access Door
821 Forward Cargo Door
F. Gray Water Drain Line Heater Installation
SUBTASK 30-71-02-420-001
(1) Put the gray water drain line [1] in position through the cargo compartment floor.
SUBTASK 30-71-02-420-002
(2) Tighten the clamp [4] on the gray water drain line [1].
SUBTASK 30-71-02-020-005
(3) Re-install the drain fitting and secure with the bolts [5] and washers [6].
SUBTASK 30-71-02-420-003
(4) Connect the electrical splices to the gray water drain line [1].
G. Gray Water Drain Line Heater Installation Test
SUBTASK 30-71-02-720-001
(1) Measure the temperature of the gray water drain line [1].
SUBTASK 30-71-02-860-003
(2) Remove the safety tags and close these circuit breakers:
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 30-71-02-720-002
(3) If the temperature in the area is lower than 45°F (7°C):
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-71-02
Page 405
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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