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 47-00-00-740-018
(8) Make sure that the BDU shows the NGS PERF LO FLOW? function.
NOTE: If the BDU does not show NGS PERF LO FLOW?, push the up or down arrow until
NGS PERF LO FLOW? shows.
SUBTASK 47-00-00-740-019
(9) Push the YES button on the BDU.
SUBTASK 47-00-00-740-020
(10) The NGS shutoff valve will open and the test will start.
(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
S = negative sign for negative values of temperature
SUBTASK 47-00-00-740-021
(11) Look at the manual locking hex bolt [4] on the NGS shutoff valve.
NOTE: The locking pin hole in the manual lock arm of the manual locking hex bolt [4] aligns
with the threaded hole in the boss of the valve when the valve is closed. The holes will
not align if the valve is not fully closed.
SUBTASK 47-00-00-740-022
(12) Make sure that the slot goes from the CLOSED position to the OPEN position.
NOTE: The manual lock arm turns 90 degrees in the counterclockwise direction when the
NGS shutoff valve is fully open.
SUBTASK 47-00-00-740-023
(13) Make sure that the NGS shutoff valve stays open during the test.
NOTE: You can go out of the Ground Operation task from the FUNCTIONAL TEST task.
Otherwise go to the subsequent step.
NOTE: The NGS shutoff valve is found in the FWD LH ECS bay.
SUBTASK 47-00-00-740-025
(14) To stop the test, push the MENU button, then the NO button on the BDU.
NOTE: Make sure that you push the MENU button, then the NO button on the BDU. If you do
not push the NO button after you push the MENU button, the NGS shutoff valve will
stay in the incorrect open position.
SUBTASK 47-00-00-212-001
(15) Make sure that the slot in the manual locking hex bolt [4] aligns with the word CLOSED on the
NGS shutoff valve.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 218
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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