(WARNING PRECEDES)
WARNING
DO NOT BREATHE THE AIR FROM THE FUEL TANK UNTIL YOU MAKE IT
SAFE. THE NITROGEN GENERATION SYSTEM DECREASES THE OXYGEN
IN THE AIR. IF YOU BREATHE AIR THAT DOES NOT HAVE SUFFICIENT
OXYGEN, DANGEROUS HEALTH CONDITIONS CAN QUICKLY OCCUR.
DANGEROUS HEALTH CONDITIONS INCLUDE NAUSEA,
UNCONSCIOUSNESS, AND CONVULSIONS. IF THE OXYGEN LEVEL OF
THE AIR THAT YOU BREATHE IS VERY LOW, IT CAN KILL YOU.
SUBTASK 47-00-00-010-008
(1) Do this task to open this access door:
Surge Tank Access Door Removal, TASK 28-11-11-000-802
Number Name/Location
633AB Surge Tank Access Door - Wing Station 655
SUBTASK 47-00-00-010-009
(2) Go to the cross vent check valve location.
NOTE: The cross vent check valve is in the right surge tank attached to the number 12 vent
stringer.
G. Cross Vent Check Valve Operational Test
SUBTASK 47-00-00-710-001
(1) Make a hook from a piece of 16 gauge wire, STD-1153, or equivalent.
(a) Insert the hook into the hole in the tang on the lower side of the flapper valve.
NOTE: Do not scratch or mar the surface of the valve flapper.
47-AWL-06: ALI
(b) Gently pull on the wire until the flapper opens.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-06.
47-AWL-06: ALI
(c) Release the wire to let the flapper close.
NOTE: The flapper should seat in the valve body.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-06.
1) If the cross vent check valve does not open or seat correctly, do these tasks:
a) Cross Vent Check Valve Removal, TASK 47-21-05-000-801.
b) Cross Vent Check Valve Installation, TASK 47-21-05-420-801.
2) If the cross vent check valve operation is satisfactory, remove the wire from the tang
on the valve.
3) Make sure that the surface of the cross vent check valve has not been scratched or
marred.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 512
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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