(d) fuel dam [2]
I. Install the Cross Vent Check Valve
SUBTASK 47-21-05-420-001
(1) Do these steps to install the cross vent check valve [1]:
(a) Put the gasket [6] on the top side of the valve face.
1) Make sure that the raised block, on the gasket [6], points to the stringers.
(b) Install the cross vent check valve [1] in the vent channel.
NOTE: The valve flange and gasket must be below the No. 12 vent stringer. The
clamping device must be in the vent channel.
1) Make sure that the clamping device engages the stringer.
(c) Hold the cross vent check valve [1] in its position.
(d) Install, but do not fully tighten, the screws [5] and washers [3] into the fuel dam [2]
nutplates.
(e) Make sure that the bolt [7] and washer [8] are attached to the clamping device.
(f) Make sure that the gasket [6] is between the cross vent check valve [1] and the bottom
side of the No. 12 vent stringer.
(g) Make sure that you align the cross vent check valve [1] with the vent channel and the fuel
dam [2].
SUBTASK 47-21-05-420-002
(2) Fully tighten the two screws [5] and the clamp bolt [7] to 55 ±4 in-lb (6.2 ±0.5 N·m).
SUBTASK 47-21-05-280-001
(3) Use intrinsically safe approved bonding meter, COM-1550, to measure the resistance between
the cross vent check valve [1] and the nearest primary structure (SWPM 20-20-00).
(a) Make sure that the total resistance is 0.010 ohm (10 milliohm) or less.
SUBTASK 47-21-05-914-001
(4) Apply sealant, A00767, or sealant, A50303, to these locations:
(a) Apply a cap seal on the bolt [7] and two screws [5].
(b) Apply a fillet seal around the periphery of the cross vent check valve [1].
J. Put the Airplane Back to Its Usual Condition
SUBTASK 47-21-05-410-001
(1) Do this task: Surge Tank Access Door - Installation, TASK 28-11-11-400-802.
(a) Close this access panel:
Number Name/Location
633AB Surge Tank Access Door - Wing Station 655
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-05
Page 408
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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