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 (Continued)
SUBTASK 47-00-00-740-010
(11) Wait until the test is complete.
NOTE: The test will take two to three minutes.
SUBTASK 47-00-00-740-011
(12) If the test is satisfactory, “SYSTEM TEST PASS” shows on the display.
SUBTASK 47-00-00-740-012
(13) If the test fails, look at the BDU test results for the list of fault messages.
I. Ground Operation of the Nitrogen Generation System
NOTE: This procedure opens the NGS shutoff valve and pressurizes the NGS and NGS ducts.
NOTE: The NGS can be warmed faster by starting the NGS PERF HI FLOW test. This can only be
done if the ambient temperature is less than 118°F (48°C).
SUBTASK 47-00-00-860-016
(1) Pressurize the pneumatic system (TASK 36-00-00-860-804, TASK 36-00-00-860-803).
(a) Let the NGS warm until the BDU display temperature reading shows 160 ±10°F
(71.1 ±5.6°C)
NOTE: The system may take 30 minutes to warm in cold ambient temperatures. Before
you start the functional test, make sure that the BDU temperature value is
160 ±10°F (71.1 ±5.6°C)
SUBTASK 47-00-00-740-013
(2) Make sure that the BDU initiated SYSTEM TEST? is complete.
SUBTASK 47-00-00-740-014
(3) Make sure that the BDU is on.
NOTE: If there is no activity for 5 minutes, the BDU will automatically go off. If the BDU goes
off, push the ON/OFF button to start the test again.
SUBTASK 47-00-00-740-015
(4) Make sure that the BDU is in the MAIN MENU mode.
SUBTASK 47-00-00-740-016
(5) The BDU will show one of these functions:
NOTE: If the BDU does not show one of these functions, push the MENU button until one of
these functions shows.
(a) EXISTING FAULTS?
(b) FAULT HISTORY?
(c) GROUND TESTS?
(d) OTHER FUNCTIONS?
SUBTASK 47-00-00-740-017
(6) Push the up or down arrow until GROUND TESTS? shows.
SUBTASK 47-00-00-740-026
(7) Push the YES button on the BDU.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 217
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF 402, 451, 452, 494-500, 503, 504, 509, 510, 514, 523-528, 541, 560-564, 567-569, 574-577, 581, 583, 585,
588-590, 592-599, 601-603, 606, 607, 610-615, 620, 625-627, 671, 672, 691-699, 832-835, 838, 856-858, 947,
948, 968-973, 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, 501, 502, 507, 508, 512, 513, 516, 518, 531-533, 535-537, 542,
552-556, 571-573, 686, 703, 707-710, 803-813, 821, 822, 831, 836, 837, 841, 842, 851, 852, 854, 855, 861-863,
871-874 POST SB 737-47-1002 OR POST SB 737-47-1003 OR POST SB 737-47-1015; ILF 491-493, 515,
519, 520, 530, 557, 559 POST SB 737-47-1002 OR POST SB 737-47-1015
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