Boeing 737-600 - Subtask 30-71-00-861-001; Subtask 30-71-00-720-001; Subtask 30-71-00-860-003; Subtask 30-71-00-860-004

ILF 101, 151, 156-199, 310, 315, 319, 323, 331-399, 402, 406, 416, 451, 452, 491-501, 503, 504, 509,
510, 512, 514, 523-528, 530-533, 535, 537, 541, 552-557, 559-564, 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, 968-973,
980-999; ILF 301, 304, 308, 314, 317, 318, 401, 405, 409, 410, 412, 424, 425, 427-429, 502, 507, 508,
513, 515, 516, 518-520, 536, 542 POST SB 737-24-1147
SUBTASK 30-71-00-861-001
(2) Make sure the CABIN/UTIL switch is set to the ON position.
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E. Check the Ground Mode Operation of the Drain Mast Heaters
SUBTASK 30-71-00-720-001
WARNING
DO NOT TOUCH THE DRAIN MAST. WHEN THE DRAIN MAST HEATER
OPERATES, THE DRAIN MAST IS SUFFICIENTLY HOT TO BURN YOU.
(1) Make sure that the forward and aft drain masts become warm.
(a) You can use an Infrared Thermometer, COM-1572 or other temperature measuring
device to make sure the drain mast is at least 10 degrees F (6 degrees C) warmer than
the ambient air temperature.
(b) As an alternative, you can use a clamp-on current meter, COM-2531 or equivalent to
measure the current to the drain mast heater.
1) Current to the drain mast indicates that the heater is operating.
2) Refer to (TASK 38-31-01-000-801) for details to access the heater wiring.
SUBTASK 30-71-00-860-003
WARNING
YOU MUST DO THE STEPS IN THE TASK BELOW TO PREPARE THE
SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE
STEPS CORRECTLY WILL CAUSE THE AUTOMATIC OPERATION OF
AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR
DAMAGE TO EQUIPMENT.
(2) Do this task: Prepare to Put the Airplane in the Air Mode, TASK 32-09-00-840-801.
SUBTASK 30-71-00-860-004
(3) Put the airplane in the air mode. To put it in the air mode, do this task: Put the Airplane in the
Air Mode, TASK 32-09-00-860-801.
SUBTASK 30-71-00-860-005
WARNING
DO NOT TOUCH THE DRAIN MAST. WHEN THE DRAIN MAST HEATER
OPERATES, THE DRAIN MAST IS SUFFICIENTLY HOT TO BURN YOU.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-71-00
Page 502
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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