ILF 402, 452, 509, 510, 523, 525-528, 576, 577; ILF 151, 156-199, 401, 405, 416, 508, 536, 541, 542, 571-575, 671,
672, 686, 703, 707-710, 803, 808-811, 813, 854-856, 861-863, 871-874, 968-970, 972, 973 POST SB 737-47-1003
(Continued)
(Continued)
SWITCH POSITION
ILF 402, 452, 509, 510, 523, 525-528, 568, 569, 576, 577, 581, 583, 585, 588-590, 592-599, 601-603, 606, 607, 610-615,
620, 625-627, 691-699, 833-835, 838, 971, 980-999; ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323,
331-399, 401, 405, 406, 409, 410, 412, 416, 424, 425, 427-429, 451, 501-504, 507, 508, 512-514, 516, 518, 524, 531-
533, 535-537, 541, 542, 552-556, 560-562, 567, 571-575, 671, 672, 686, 703, 707-710, 803-813, 821, 822, 831, 832,
836, 837, 841, 842, 851, 852, 854-858, 861-863, 871-874, 947, 948, 968-970, 972, 973 POST SB 737-47-1003
SUBTASK 47-00-00-860-017
(3) Supply conditioned air (TASK 21-00-00-800-803).
SUBTASK 47-00-00-780-003
(4) Do a check of the manifold duct pressure.
(a) Look at the dual duct pressure gage on the P5 panel.
(b) Make sure that the L and R duct pressure is 20 psig (138 kPa) or more.
SUBTASK 47-00-00-740-055
(5) Push the MENU button on the BITE display unit (BDU).
SUBTASK 47-00-00-740-056
(6) Push the up or down arrows until the BDU shows the GROUND TESTS? function.
SUBTASK 47-00-00-740-057
(7) Push the YES button on the BDU.
SUBTASK 47-00-00-740-058
(8) Push the up or down arrows on the BDU until one of these functions shows:
(a) NGS PERF LOW FLOW?
NOTE: Use this function to do a leak check of the NGS components in the low flow
mode, upstream of the ASM.
(b) NGS PERF HI FLOW?
NOTE: Use this function to do a leak check between the ASM and the flame arrestor at
the left wing rear spar. Do not use the NGS PERF HI FLOW? function if the
ambient temperature is above 118°F (48°C). On the ground, the NGS can get too
hot when you pressurize the NGS in the high flow mode.
SUBTASK 47-00-00-730-001
(9) Push the YES button to start the applicable test.
SUBTASK 47-00-00-730-002
(10) The NGS shutoff valve will open and pressurize the NGS.
(a) The display on the BDU will show these messages:
1) GSE O2 SNS: XX.X% (or GSE O2 SNS: WARM during warmup mode)
NOTE: xx.x is the O2% reading from the Oxygen Sensor.
2) P: YY PSIA
NOTE: YY = current pressure
3) T: SZZZ F
NOTE: ZZZ = current temperature
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 603
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF 402, 452, 509, 510, 523, 525-528, 568, 569, 576, 577, 581, 583, 585, 588-590,
592-599, 601-603, 606, 607, 610-615, 620, 625-627, 691-699, 833-835, 838, 971, 980-999;
ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 405,
406, 409, 410, 412, 416, 424, 425, 427-429, 451, 501-504, 507, 508, 512-514, 516, 518,
524, 531-533, 535-537, 541, 542, 552-556, 560-562, 567, 571-575, 671, 672, 686, 703,
707-710, 803-813, 821, 822, 831, 832, 836, 837, 841, 842, 851, 852, 854-858, 861-863,
871-874, 947, 948, 968-970, 972, 973 POST SB 737-47-1003
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