DRAIN MAST HEATERS - REMOVAL/INSTALLATION
1. General
A. This procedure consists of task references to remove and install the drain masts.
(1) The drain mast heaters are built into the drain masts.
(2) If a heater fails the sensor must be replaced.
TASK 30-71-05-900-801
2. Drain Mast Heater Replacement
A. References
Reference Title
38-31-01-000-801 Forward Drain Mast Removal (P/B 401)
38-31-01-000-802 Aft Drain Mast Removal (P/B 401)
38-31-01-400-801 Forward Drain Mast Installation (P/B 401)
38-31-01-400-802 Aft Drain Mast - Installation (P/B 401)
B. Location Zones
Zone Area
100 Lower Half of Fuselage
C. Drain Mast Heater Replacement
SUBTASK 30-71-05-900-001
(1) To replace a forward drain mast:
These are the tasks:
Forward Drain Mast Removal, TASK 38-31-01-000-801,
Forward Drain Mast Installation, TASK 38-31-01-400-801.
SUBTASK 30-71-05-900-002
(2) To replace the aft drain mast:
These are the tasks:
Aft Drain Mast Removal, TASK 38-31-01-000-802,
Aft Drain Mast - Installation, TASK 38-31-01-400-802.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-71-05
Page 401
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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