TASK 47-21-05-420-801
3. Cross Vent Check Valve Installation
(Figure 401)
A. General
(1) For application of sealants in the fuel tank structure(s), it is acceptable to use sealant, A50303,
as an alternative to sealant, A00767, for Class A and B applications:
(a) sealant, A50153, can be used as an alternative to sealant, A50301.
(b) sealant, A50110, can be used as an alternative to sealant, A50302.
(c) sealant, A50153, cannot be used in combination with sealant, A50302, and sealant,
A50301, cannot be used with sealant, A50110.
B. References
Reference Title
28-11-00-910-802 Fuel Tank - Purging and Tank Entry (P/B 201)
28-11-11-400-802 Surge Tank Access Door - Installation (P/B 401)
SWPM 20-20-00 ELECTRICAL BONDING PROCESSES
C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
COM-1550 Bonding Meters - Approved, Intrinsically Safe (Approved for use in
Class I, Divisions I & II hazardous (classified) locations. Outside
these hazardous locations, COM-614 can be used in lieu of
COM-1550).
737-600, -700, -800
Part #: 620LK Supplier: 1CRL2
Part #: M1 Supplier: 3AD17
Part #: T477W (C15292) Supplier: 01014
Opt Part #: M1B Supplier: 3AD17
D. Consumable Materials
Reference Description Specification
A00767 Sealant - Fuel Tank BMS5-45
A50110 Sealant BMS5-45 Class B-2
A50153 Sealant - Fuel Tank - Class A-2 BMS5-45 Class A-2
A50301 Sealant - Fast Cure Fuel Tank Sealant BMS5-168 Type I Class
A-2
A50302 Sealant - Fast Cure Fuel Tank Sealant BMS5-168 Type I Class
B-2
A50303 Sealant - Fast Cure Fuel Tank Sealant BMS5-168
E. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
1 Cross vent check valve 47-21-05-01-020 ILF 494, 495, 857, 858,
947
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-05
Page 406
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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