SUBTASK 30-31-00-865-002
(7) Make sure that these circuit breakers are closed:
CAPT Electrical System Panel, P18-3
Row Col Number Name
C 1 C00523 HEATERS CAPT PITOT
C 2 C00238 HEATERS TEMP PROBE
C 3 C01072 HEATERS ALPHA VANE LEFT
C 4 C00236 HEATERS ELEV PITOT LEFT
D 3 C01071 HEATERS ALPHA VANE RIGHT
D 4 C00237 HEATERS ELEV PITOT RIGHT
D 5 C00525 HEATERS F/O PITOT
D 6 C00524 HEATERS AUX PITOT
(a) Make sure the amber OVERHEAT lights on the window and pitot heat module go off.
SUBTASK 30-31-00-860-003
(8) Put the PROBE HEAT A switch in the ON position.
(a) Make sure the CAPT PITOT, L ELEV PITOT, L ALPHA VANE, and TEMP PROBE lights
on the window and pitot heat module go off.
SUBTASK 30-31-00-860-004
(9) Put the PROBE HEAT B switch in the ON position.
(a) Make sure the F/O PITOT, R ELEV PITOT, R ALPHA VANE, and AUX PITOT lights on the
window and pitot heat module go off.
WARNING
DO NOT TOUCH AIR DATA SENSORS WHEN HOT. A HOT AIR DATA
SENSOR CAN CAUSE INJURIES TO PERSONNEL AND DAMAGE TO
EQUIPMENT CAN OCCUR.
(b) Make sure the air data sensor heaters get warm. Here are some optional ways to do this:
NOTE: You will need a work platform, COM-1523 or equivalent to get access to the
elevator pitot probe. If you use an infrared or thermal imager to check for heat,
then you do not need the stand.
1) Spray the air data sensors with water to check for heat.
2) Measure the temperature of the sensor with 0-150 +/- 2 degrees F digital
thermometer, STD-1336.
3) Look at the sensor with 0-150 +/- 2 degrees F digital thermometer, STD-1336.
ILF 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 412, 536, 561, 562, 581, 583, 610, 671, 672,
836, 837, 851, 852, 857, 858
SUBTASK 30-31-00-860-007
(10) Press and hold the TAT TEST switch.
(a) Make sure the TAT probe heaters get warm.
SUBTASK 30-31-00-860-008
(11) Release the TAT TEST switch.
ILF ALL
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-31-00
Page 506
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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