ILF 101, 151, 156-199, 401, 402, 405, 406, 409, 410, 412, 416, 424, 425, 427-429, 451, 452, 491-504,
507-510, 512-516, 518-520, 523-528, 530-533, 535-537, 541, 542, 552-557, 559, 560, 562-564, 567-569,
571-577, 581, 583, 585, 588-590, 592-599, 601-603, 606, 607, 610-615, 620, 625-627, 671, 672, 686,
691-699, 703, 707-710, 803-813, 821, 822, 831-838, 841, 842, 851, 852, 854-858, 861-863, 871-874,
947, 948, 971
1) Make sure that the corresponding ON light on the window and pitot heat module
comes on.
NOTE: It can take up to 15 seconds for the light to come on.
ILF 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 561, 968-970, 972, 973, 980-999
2) Make sure that the corresponding OFF light on the window and pitot heat module
goes out.
NOTE: It can take up to 15 seconds for the light to go out.
ILF ALL
3) Make sure that both master caution lights are off.
(b) Wait for the windows to heat up.
1) Use a Infrared Thermometer, COM-1572 (including pyrometer, STD-1179), or other
temperature indicating device near each window temperature sensor to measure
the window temperature.
2) Make sure that the front and side windows stabilize at 90 to 120 degrees F (32 to 49
degrees C).
NOTE: It can take up to 4 minutes for the window temperatures to stabilize.
(c) Put the WINDOW HEAT power switches in the off position.
1) Make sure that the OVERHEAT lights, the MASTER CAUTION lights, and the
ANTI-ICE lights are off.
SUBTASK 30-41-21-010-003
(2) Remove the applicable WHCU for the window (Table 502).
(a) Do this task: Window Heat Control Unit (WHCU) Removal, TASK 30-41-11-000-801
SUBTASK 30-41-21-840-002
(3) Make sure that the window temperature is between 68 and 108 degrees F (20 and 42 degrees
C).
G. Procedure
SUBTASK 30-41-21-760-002
(1) Measure the resistance of the applicable window temperature sensor.
(a) Make sure that the resistance of the sensor is within the limits shown on Window Heat
Control Sensor Resistance/Figure 503.
Table 502/30-41-21-993-804
WINDOW TEMP
SENSOR
CONNECTOR/PINS RESISTANCE
*[1]
WHCU WDM
LEFT FRONT 1 D1044A/ 13 TO 26 304-342 OHMS M321 30-41-11
RIGHT SIDE 2 D1042A/ 13 TO 26 304-342 OHMS M320 30-41-11
RIGHT SIDE 2 (Spare) D16230/ 16 TO 17 304–342 OHMS M321 30–41–11
RIGHT FRONT 1 D1048A/ 13 TO 26 304-342 OHMS M323 30-41-12
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-21
Page 507
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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