BACKFLOW CHECK VALVE - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) Primary Backflow Prevention Check Valve Removal
(2) Primary Backflow Prevention Check Valve Installation
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
(3) Secondary Backflow Prevention Check Valve Removal
(4) Secondary Backflow Prevention Check Valve Installation
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
B. Access Notes:
(1) The primary backflow prevention check valve is inside the center tank. You will need to go into
the center tank to remove and install the check valve.
TASK 47-21-04-000-801
2. Primary Backflow Prevention Check Valve Removal
(Figure 401)
A. General
(1) The primary backflow prevention check valve is referred to as the check valve [1] in this task.
B. References
Reference Title
28-11-00-910-802 Fuel Tank - Purging and Tank Entry (P/B 201)
28-11-31-000-801 Center Tank Access Door Removal (P/B 401)
28-26-00-650-801 Fuel Tank Defueling (P/B 201)
28-26-00-650-802 Tank to Tank Fuel Transfer (P/B 201)
C. Location Zones
Zone Area
531 Left Wing - Center Fuel Tank, Rib 1 to Rib 5
D. Access Panels
Number Name/Location
531AB Center Tank Access Door - Wing Station 168
E. Prepare for the Removal
SUBTASK 47-21-04-650-001
(1) Defuel or transfer fuel from the center tank (TASK 28-26-00-650-801 or
TASK 28-26-00-650-802).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-04
Page 401
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
To Next Page
Loading...
