F. Prepare for Installation
SUBTASK 47-21-04-010-004
(1) Go into the center tank (TASK 28-11-00-910-802).
SUBTASK 47-21-04-010-005
(2) Remove the protective covers from the NEADS tube [6], the ejector tube [3], and the flareless
fitting [4].
SUBTASK 47-21-04-110-001
(3) Prepare these components for an electrical surface bond (SWPM 20-20-00):
(a) mating surface of the NEADS tube [6]
(b) mating surfaces of the ejector tube [3]
(c) mating surfaces of bonding jumper [2] and bonding jumper [24]
(d) mating surfaces of the clamp [28]
G. Install the Check Valve
SUBTASK 47-21-04-420-005
(1) Align the flareless fitting [4] to the nut [32].
(a) Install, but do not fully tighten, the nut [32] on the flareless fitting [4].
SUBTASK 47-21-04-400-001
(2) Hold the check valve [1] in position.
NOTE: Make sure that you can see the FLOW ARROW and that the arrow direction points
down.
NOTE: Make sure that the stamped word HINGE (or TOP) point to the forward direction of the
aircraft.
(a) Install, but do not fully tighten, the NEADS tube [6] on the check valve [1]
(b) Align the check valve [1] to the ejector tube [3].
(c) Install, but do not fully tighten, the ejector tube [3] on the check valve [1].
SUBTASK 47-21-04-430-009
(3) Tighten the two clamps[19] that hold the NEADS tube [6] to the structure.
SUBTASK 47-21-04-430-010
(4) Attach the P-clamp [5] and NEADS tube [6] to the structure with the screw [31], washer [30],
and nut [29].
SUBTASK 47-21-04-430-011
(5) Tighten the nut [32] to 280 ±28 in-lb (31.6 ±3.2 N·m)
NOTE: Use a second wrench on the nut to stop the NEADS tube [6] from turning.
SUBTASK 47-21-04-430-012
(6) Attach the bonding jumper [24] to the NEADS tube [6] with a clamp [28], screw [25],
washers [26], and nut [27].
SUBTASK 47-21-04-430-013
(7) Tighten the nut [8] to 280 ±28 in-lb (31.6 ±3.2 N·m)
NOTE: Use a second wrench on the check valve [1] adjacent to the nut [8] to hold it.
SUBTASK 47-21-04-430-014
(8) Tighten the nut [7] to 280 ±28 in-lb (31.6 ±3.2 N·m)
NOTE: Use a second wrench on the check valve [1] adjacent to the nut [7] to hold it.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-04
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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