TASK 47-00-00-440-801
3. MMEL 47-1 (DDPG) Restoration - Nitrogen Generation System Inoperative
(Figure 901)
A. General
(1) This task restores an airplane with an inoperative Nitrogen Generation System (NGS).
B. References
Reference Title
36-00-00-860-806 Remove Pressure from the Pneumatic System (P/B 201)
C. Location Zones
Zone Area
131 Center Section Wing Box, Body Station 540.00 to Body Station 663.75 - Left
212 Flight Compartment - Right
D. Access Panels
Number Name/Location
192CL ECS Access Door
E. Nitrogen Generation System Reactivation
SUBTASK 47-00-00-864-006
(1) Do this task: Remove Pressure from the Pneumatic System, TASK 36-00-00-860-806.
(a) Make sure that the dual duct pressure gage shows 0.50 psi (3.45 kPa) in the left and right
pneumatic ducts.
SUBTASK 47-00-00-860-013
(2) Put the L PACK and R PACK selector switches, found on the P5-10 air conditioning panel, to
the OFF position.
(a) Put DO-NOT-OPERATE tags on the L PACK and R PACK selector switches.
SUBTASK 47-00-00-010-007
WARNING
OBEY THE SUBSEQUENT STEPS FOR ACCESS PANELS IDENTIFIED WITH
A NITROGEN GENERATION SYSTEM PLACARD. IF THERE IS A LEAK IN THE
NITROGEN GENERATION SYSTEM, IT WILL DECREASE THE OXYGEN IN
THE AIR THAT YOU BREATHE. IF YOU BREATHE AIR THAT DOES NOT HAVE
SUFFICIENT OXYGEN, DANGEROUS HEALTH CONDITIONS CAN QUICKLY
OCCUR.
WARNING
DO NOT TOUCH THE COMPONENTS OF THE NITROGEN GENERATION
SYSTEM WHEN THEY ARE HOT. WHEN THE COMPONENTS ARE HOT,
THEY CAN CAUSE INJURIES TO PERSONNEL.
(3) Open this access panel:
Number Name/Location
192CL ECS Access Door
SUBTASK 47-00-00-440-003
(4) Go to the NGS shutoff valve location.
NOTE: The NGS shutoff valve is on the forward bulkhead of the left air conditioning
compartment.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 906
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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