SUBTASK 47-21-07-420-001
(2) Install the flame arrestor [1]:
(a) Put the flame arrestor [1] in its position on the rear spar in the left wheel well.
(b) Put the washer [2] and the nut [3] on the flame arrestor [1] in the center tank.
(c) Make sure the flame arrestor [1] correctly aligns.
(d) Tighten the nut [3] to 280 ±28 in-lb (32 ±4 N·m).
NOTE: Use a second wrench to make sure the flame arrestor [1] does not turn.
SUBTASK 47-21-07-430-002
(3) Do these steps to connect the flame arrestor [1] to the NEA distribution system:
(a) Connect the NEADS tube [5] in the center tank to the flame arrestor [1].
(b) Tighten the nut on the flareless fitting [4].
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 47-21-07-430-003
(4) From outside of the center tank, connect the dielectric hose [6] to the flame arrestor [1].
(a) Tighten the nut on the dielectric hose [6].
NOTE: Use a second wrench to hold the dielectric hose [6] to make sure that it does not
twist.
ILF 494-500, 563, 564; 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 AND PRE SB 737-47-1003; ILF 451, 503, 504,
514, 524, 541, 560-562, 567, 574, 575, 671, 672, 832, 856-858, 947, 948, 968-970, 972, 973 PRE SB
737-47-1003; ILF 491-493, 515, 519, 520, 530, 557, 559 POST SB 737-47-1002
SUBTASK 47-21-07-420-004
(5) From outside the center tank, connect the pressure seal cap [8] to the flame arrestor [1].
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
SUBTASK 47-21-07-765-002
47-AWL-01: CDCCL
(6) Measure the electrical bonding resistance between the flame arrestor [1] (bulkhead fitting) and
the rear spar structure outside the tank (SWPM 20-20-00).
NOTE: CDCCL - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on Critical Design Configuration
Control Limitations (CDCCLs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-01.
(a) Use an intrinsically safe approved bonding meter, COM-1550, to make the measurement.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-07
Page 413
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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