WINDOW HEAT CONDUCTIVE COATING AND SENSOR - ADJUSTMENT/TEST
1. General
A. This procedure has these tasks:
(1) Check of the electrical resistance of the window heat film.
(2) Check of the temperature sensors on windows 1 and 2.
TASK 30-41-21-000-801
2. Check the Electrical Resistance of the Window Heat Film
(Figure 501)
A. General
(1) The number 1 and number 2 windows have a layer of material which heat the windows when
electricity is applied. The window heat control units (WHCUs) provide power to heat the
windows. The WHCUs have various output connections which should be matched to each
window resistance. This test checks the electrical resistance of the window heaters and makes
sure the heaters are matched to the WHCU.
B. References
Reference Title
30-41-11-000-801 Window Heat Control Unit (WHCU) Removal (P/B 401)
30-41-11-400-801 Window Heat Control Unit (WHCU) Installation (P/B 401)
C. Location Zones
Zone Area
117 Electrical and Electronics Compartment - Left
118 Electrical and Electronics Compartment - Right
121 Forward Cargo Compartment - Left
122 Forward Cargo Compartment - Right
D. Prepare for the Procedure
SUBTASK 30-41-21-010-001
(1) Remove the applicable WHCU for the window (TASK 30-41-11-000-801).
NOTE: See Table 501 to identify which Window Heat Control Unit (WHCU) needs to be
removed.
SUBTASK 30-41-21-010-002
(2) Remove the panels on the forward end of the forward cargo compartment to access the
window heat terminal connections (Figure 501).
E. Procedure
SUBTASK 30-41-21-020-001
(1) Remove the window connector terminals D40070P and D40068P from the terminal blocks
(Figure 501 and Table 501).
SUBTASK 30-41-21-760-001
(2) Measure the resistance at pins A3 and F of each connector to ground.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-21
Page 501
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
To Next Page
Loading...
