TASK 30-41-21-760-801
3. Measure the Resistance of the Window Temperature Sensors
(Figure 502, Figure 503)
A. General
(1) The number 1 and number 2 windows have sensors which measure the temperature of the
windows. This test checks the electrical resistance of the window temperature sensors.
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. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
COM-1572 Thermometer - Infrared, Intrinsically Safe
737-600, -700, -800
Part #: 568 Ex Supplier: 89536
Opt Part #: DHS24XC-FM Supplier: 08086
Opt Part #: DHS24XF-FM Supplier: 08086
Opt Part #: EX-MP4 A Supplier: 3GT36
Opt Part #: IR-16L3 IS Supplier: 75037
STD-1179
Tester - Pyrometer
D. Consumable Materials
Reference Description Specification
D50244 Compound - Dow Corning 340 Heat Sink
Compound
G01659 Swab - Cotton Or Rayon, (Disposable)
E. Location Zones
Zone Area
117 Electrical and Electronics Compartment - Left
118 Electrical and Electronics Compartment - Right
F. Prepare for the Procedure
SUBTASK 30-41-21-860-002
(1) Do these steps to heat the windows if the temperature is too cold:
NOTE: These steps can be used if the ambient temperature is significantly less the specified
test temperature range of 68 to 108 degrees F (20 to 42 degrees C).
(a) One switch at a time, put the WINDOW HEAT switches on the Window and Pitot Heat
Module to the on position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-21
Page 506
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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