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 (Continued)
B. References
Reference Title
28-11-00-910-801 Purging and Fuel Tank Entry Precautions (P/B 201)
C. Location Zones
Zone Area
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station 727.00 - Right
192 Lower Wing-To-Body Fairing - Under Wing Box
531 Left Wing - Center Fuel Tank, Rib 1 to Rib 5
631 Right Wing - Center Fuel Tank, Rib 1 to Rib 5
633 Right Wing - Surge Tank, Rib 22 to Rib 25, Wing Station 643.50 to Wing Buttock
Line 616.75
D. Physiological Effects of a Low Oxygen Content Environment
SUBTASK 47-00-00-910-001
(1) NEA increases the nitrogen content and decreases the oxygen of the air. If you breathe air
without sufficient oxygen, it can have dangerous and immediate effects. If a person breathes
air without sufficient oxygen, these health problems can occur:
Make sure that you read and obey the warning placard in areas where there you can find
nitrogen enriched air. Read and obey the warnings in the maintenance instructions. Nitrogen
generation equipment is dangerous because you cannot see or smell the gas. The equipment
decreases the oxygen in the air to a condition that is not health safe. It can cause hypoxia.
Hypoxia can make you dizzy, nauseous, unconscious, and can kill you.
(a) A person that breathes air with a low oxygen content cannot sense that the oxygen level
is too low. The victim can become unconscious before the person is aware of the low
oxygen content air.
(b) An organic vapor filter respirator will not help you breathe in a low oxygen environment.
E. Fuel Tank Entry Precautions
SUBTASK 47-00-00-910-002
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.
(1) For NGS related fuel tank purging and entry precautions obey the steps in this task: Purging
and Fuel Tank Entry Precautions, TASK 28-11-00-910-801.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 204
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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