WATER AND DRAIN ANTI-ICING SYSTEM - MAINTENANCE PRACTICES
1. General
A. This procedure has these tasks:
(1) Anti-ice operation for the drain mast with 115 Volts AC on the Ground.
(2) Drain heaters - deactivation.
(3) Drain heaters - activation.
TASK 30-71-00-800-801
2. Water and Drain Operation with 115 Volts on the Ground
A. General
(1) 28 volts AC is normally used to provide protection from icing for the water and drain system
while the airplane is on the ground. 115 volt AC is used while the airplane is in the air.
(2) This task should only be used when the 28 volt operation will not remove ice from the drain
masts.
(3) Refer to Cold Weather Maintenance Procedure, TASK 12-33-01-600-802.
B. References
Reference Title
12-33-01-600-802 Cold Weather Maintenance Procedure (P/B 301)
32-09-00-840-801 Prepare to Put the Airplane in the Air Mode (P/B 201)
32-09-00-860-801 Put the Airplane in the Air Mode (P/B 201)
32-09-00-860-802 Return the Airplane to the Ground Mode (P/B 201)
C. Location Zones
Zone Area
100 Lower Half of Fuselage
211 Flight Compartment - Left
212 Flight Compartment - Right
D. Procedure
SUBTASK 30-71-00-020-001
WARNING
OBEY THE PROCEDURE THAT PREPARES TO PUT THE AIRPLANE IN THE
AIR MODE. IN THE AIR MODE, MANY OF THE AIRPLANE SYSTEMS CAN
OPERATE. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO
EQUIPMENT CAN OCCUR.
(1) Do this task: Prepare to Put the Airplane in the Air Mode, TASK 32-09-00-840-801.
SUBTASK 30-71-00-020-002
(2) Do this task: Put the Airplane in the Air Mode, TASK 32-09-00-860-801.
SUBTASK 30-71-00-020-003
(3) Make sure that this circuit breaker is closed:
CAPT Electrical System Panel, P18-3
Row Col Number Name
E 4 C00700 HEATERS DRAIN MAST AIR
NOTE: This circuit breaker is opened in the Prepare for Air Mode Simulation task. It must be
closed for the operation of the drain mast in the air (high heat) mode.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-71-00
Page 201
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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