NITROGEN GENERATION SYSTEM - INSPECTION/CHECK
1. General
A. This procedure contains scheduled maintenance task data.
B. This procedure has these tasks:
(1) Leak Check of the Nitrogen Generation System
(a) This task will make sure the nitrogen generation system (NGS) is within permitted leak
limits. Do this procedure as a general leak check for the nitrogen generation system or as
a post-installation leak check after you replace a NGS component or duct.
(b) This procedure pressurizes the nitrogen generation system (NGS) and does a leak check
of these components:
1) Thermal Control Unit (TCU)
2) Air Separation Module (ASM)
3) Nitrogen-Enriched Air Distribution System (NEADS) line from the ASM to the rear
spar penetration on the center wing tank
4) Tubes and ducts that connect the NGS components
(2) Leak Check of the Nitrogen-Enriched Air Distribution System (NEADS) Lines
TASK 47-00-00-790-801
2. Leak Check of the Nitrogen Generation System
(Figure 601, Figure 602)
A. General
(1) This procedure is a scheduled maintenance task.
(2) 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-07.
B. References
Reference Title
21-00-00-800-803 Supply Conditioned Air with a Cooling Pack (P/B 201)
21-00-00-800-804 Remove Conditioned Air Supplied by a Cooling Pack (P/B 201)
36-00-00-860-801 Supply Pressure to the Pneumatic System (Selection) (P/B 201)
36-00-00-860-806 Remove Pressure from the Pneumatic System (P/B 201)
47-00-00-800-801 Ground Operation of the Nitrogen Generation System (P/B 201)
47-00-00-910-802 Airworthiness Limitation Precautions (P/B 201)
47-21-00-700-802 Drain Cap - Fuel Leak Check (P/B 601)
47-32-01 P/B 401 NGS SHUTOFF VALVE - REMOVAL/INSTALLATION
49-11-00-860-802 APU Usual Shutdown (P/B 201)
71-00-00-700-819-F00 Stop the Engine Procedure (Usual Engine Stop) (P/B 201)
C. Consumable Materials
Reference Description Specification
G00034 Cotton Wiper - Process Cleaning Absorbent
Wiper (Cheesecloth, Gauze)
BMS15-5 Class A
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 601
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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