WINDOW HEAT CONTROL UNIT - ADJUSTMENT/TEST
1. General
A. This procedure has a task to test the window heat control units.
TASK 30-41-11-710-801
2. Window Heat Control Unit System - Test
(Figure 501)
A. General
(1) The window heat control units (WHCU) are installed in the EE compartment. A BITE module is
installed on all the control units. The test makes sure the WHCUs operate properly.
(2) The WHCUs can be tested separately or they can all be tested at the same time.
B. Location Zones
Zone Area
117 Electrical and Electronics Compartment - Left
118 Electrical and Electronics Compartment - Right
211 Flight Compartment - Left
212 Flight Compartment - Right
C. Access Panels
Number Name/Location
117A Electronic Equipment Access Door
D. Prepare for the Test
SUBTASK 30-41-11-010-004
(1) Open this access panel to get access to the EE compartment:
Number Name/Location
117A Electronic Equipment Access Door
SUBTASK 30-41-11-860-002
(2) Press and release the BIT LAMP RESET switch on the WHCUs.
(a) Make sure all the indicator lights are off.
E. Test the Normal Functions of the WHCUs
SUBTASK 30-41-11-860-003
(1) Make sure the window temperature is less than 110°F (43°C).
NOTE: If the window temperature is more than 110°F (43°C), WHCU will not supply electrical
power to heat the window.
(2) One switch at a time, put the WINDOW HEAT power switches on the window/pitot heat control
panel, P5–9, to the ON position.
NOTE: If you are only testing one WHCU, you only need to put the applicable switch in the
ON position. The table in (Figure 501) shows which WHCU controls each window heat.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-11
Page 501
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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