TASK 47-00-00-710-801
3. Cross Vent Check Valve - Operational Test
(Figure 503)
NOTE: This procedure is a scheduled maintenance task.
A. General
(1) This task has one or more steps which are a means to satisfy Airworthiness Limitation
Instruction (ALI) requirements. An ALI note will follow the step to which it applies. Any step or
sub-step that precedes or follows an ALI identified step is not subject to the ALI requirement.
NOTE: This is applicable to Airworthiness Limitation 47-AWL-06.
(2) The cross vent check valve opens during overfuel conditions to relieve fuel tank pressure. The
valve is normally closed to prevent ambient air from entering the center tank during the
descent phase of flight.
B. References
Reference Title
28-11-11-000-802 Surge Tank Access Door Removal (P/B 401)
28-11-11-400-802 Surge Tank Access Door - Installation (P/B 401)
47-00-00-910-802 Airworthiness Limitation Precautions (P/B 201)
47-21-05-000-801 Cross Vent Check Valve Removal (P/B 401)
47-21-05-420-801 Cross Vent Check Valve Installation (P/B 401)
C. Tools/Equipment
Reference Description
STD-1153
Wire - Stiff, Single Strand, 16 Gauge
D. Location Zones
Zone Area
633 Right Wing - Surge Tank, Rib 22 to Rib 25, Wing Station 643.50 to Wing Buttock
Line 616.75
E. Access Panels
Number Name/Location
633AB Surge Tank Access Door - Wing Station 655
F. Prepare for the Test
WARNING
CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO PREPARE TO GO
INTO THE FUEL TANK. IF YOU DO NOT OBEY THE SAFETY PROCEDURES,
YOU CAN CAUSE AN EXPLOSION. AN EXPLOSION WILL CAUSE INJURIES
TO PERSONNEL, AND DAMAGE TO EQUIPMENT.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 511
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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
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