SUBTASK 47-21-04-910-001
WARNING
OBEY THE PRECAUTIONS FOR PURGING AND FUEL TANK ENTRY. IF YOU
DO NOT OBEY THE PRECAUTIONS, INJURIES TO PERSONNEL AND
DAMAGE TO EQUIPMENT CAN OCCUR.
(2) Do this task: Fuel Tank - Purging and Tank Entry, TASK 28-11-00-910-802.
SUBTASK 47-21-04-010-003
WARNING
DO ALL THE SAFETY PROCEDURES TO DEFUEL THE TANK AND TO GO
INTO IT. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR
IF YOU DO NOT FOLLOW THE SAFETY PROCEDURES.
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.
(3) To get access to the center tank, do this task: Center Tank Access Door Removal,
TASK 28-11-31-000-801.
Open this access panel:
Number Name/Location
531AB Center Tank Access Door - Wing Station 168
SUBTASK 47-21-04-010-001
(4) Go into the center tank (TASK 28-11-00-910-802).
SUBTASK 47-21-04-010-002
(5) Go to the check valve [1] location.
NOTE: The check valve is installed in the center tank, left side, forward of the vent stringer.
F. Prepare the NEADS Tube
SUBTASK 47-21-04-030-001
(1) Disconnect the P-clamp [5] from the NEADS tube [6].
(a) Remove the P-clamp [5], screw [31], two washers [30], and nut [29].
SUBTASK 47-21-04-030-005
(2) Loosen the two clamps [19].
SUBTASK 47-21-04-030-006
(3) Loosen the nut [32] to disconnect the NEADS tube [6].
SUBTASK 47-21-04-030-007
(4) Disconnect the bonding jumper [24].
(a) Remove the clamp [28], screw [25], two washers [26], and nut [27].
SUBTASK 47-21-04-560-001
(5) Swing the NEADS tube [6].
NOTE: The NEADS tube [6] is not flexible. Swing slowly to prevent damage.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-04
Page 402
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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