SUBTASK 47-21-04-430-015
(9) Attach the bonding jumper [2] and clamp [22] to the ejector tube [3] with the screw [20],
washers [21], clamp [22], and nut [23].
SUBTASK 47-21-04-700-001
(10) Use an intrinsically safe approved bonding meter, COM-1550, to measure the electrical
resistance between check valve [1] and the nearest primary structure. (SWPM 20-20-00).
ILF 494-500, 560-564, 567-569, 581, 583, 585, 588-590, 592-599, 601-603, 606, 607, 610-615, 620,
625-627, 671, 672, 691-699, 833-835, 838, 857, 858, 947, 948, 968-973, 980-999
(a) Make sure that the electrical resistance is 0.010 ohm (10 milliohms) or less.
ILF 402, 451, 452, 503, 504, 509, 510, 514, 523-528, 541, 574-577, 832, 856; 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, 491-493, 501, 502, 507, 508, 512, 513, 515, 516, 518-520, 530-533, 535-537, 542, 552-557,
559, 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
(b) Make sure that the electrical resistance is 0.020 ohm (20 milliohms) or less.
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
H. Put the Airplane Back to Its Usual Condition
SUBTASK 47-21-04-410-001
(1) Do this task: Center Tank Access Door - Installation, TASK 28-11-31-400-801:
(a) Close this access panel:
Number Name/Location
531AB Center Tank Access Door - Wing Station 168
END OF TASK
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
TASK 47-21-04-000-803
4. Secondary Backflow Prevention Check Valve Removal
(Figure 402)
A. General
(1) The secondary backflow prevention check valve [16] is referred to as the check valve [16] in
this procedure.
B. References
Reference Title
36-00-00-860-806 Remove Pressure from the Pneumatic System (P/B 201)
47-21-00-700-802 Drain Cap - Fuel Leak Check (P/B 601)
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-04
Page 409
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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