D. Window Heat System Operational Test
SUBTASK 30-41-00-080-001
CAUTION
ALL PROTECTIVE CAPS AND COVERS MUST BE REMOVED FROM ALL AIR
DATA SENSORS. THE SENSORS AND COVERS COULD BE DAMAGED IF
THERE ARE COVERS INSTALLED ON THE SENSORS WHEN THEY ARE
HEATED.
(1) Make sure that there are no protective covers on the air data sensors.
(a) If protective covers are found, then remove them before you continue this test.
SUBTASK 30-41-00-840-001
(2) 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.
SUBTASK 30-41-00-880-001
(3) If the window temperature is greater than 110°F (43°C), then cool the window.
NOTE: The window can be cooled with cool water or by providing shade from the sun.
SUBTASK 30-41-00-860-001
(4) One switch at a time, put the WINDOW HEAT switches on the Window and Pitot Heat Module
to the on position.
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
(a) 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
(b) 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
(c) Make sure that both master caution lights are off.
SUBTASK 30-41-00-210-001
(5) Wait for the windows to heat up.
(a) Make sure that the front and side windows stabilize at 90°F (32°C) to 120°F (49°C).
NOTE: It can take up to 4 minutes for the window temperatures to stabilize.
ILF 502, 503, 514, 524, 707-710; ILF 101, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323,
332-399, 401, 409, 410, 412, 416, 424, 425, 427-429, 451, 501, 504, 507, 508, 513, 515, 516, 518,
531-533, 535-537, 541, 542, 552, 556, 557, 571-574, 576, 686, 803-813, 821, 822, 831, 854-856,
861-863, 871-873 PRE SB 737-56-1017
(b) Make sure that the number 4 and number 5 windows heat up to more than 90°F (32°C)
but less than 125°F (52°C).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-00
Page 502
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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