NITROGEN GENERATION SYSTEM - ADJUSTMENT/TEST
1. General
A. This procedure has these tasks:
(1) Functional Test of the Nitrogen Generation System.
(2) Cross Vent Check Valve - Operational Test
B. The purpose of the NGS functional test is to do a check of the performance of the air separation
module (ASM). ASM performance is measured by the purity of the nitrogen-enriched air (NEA)
delivered to the center wing tank.
C. To test the purity of the NEA, it is necessary to check the NGS operational temperature, pressure
and the oxygen percentage in the NEA stream. The NGS temperature and pressure measurements
are calculated by the NGS controller and shown on the BITE display unit (BDU). To test the oxygen
percentage, an oxygen analyzer is connected to the GSE test port on the NEADS line. The percent
oxygen (displayed on the oxygen analyzer) and NGS inlet pressure (displayed on the BDU) are
plotted on a go-no-go graph. Low flow NEA purity and high flow NEA purity graphs for the ASM are
supplied with this procedure.
TASK 47-00-00-720-801
2. Functional Test of the Nitrogen Generation System
(Figure 501Figure 502)
A. General
(1) There are two options to measure the oxygen concentration in the NEADS line. The primary
option is to use the NGS BITE Display Unit (BDU). An alternative to the BDU is to use an
oxygen analyzer, COM-7456. The oxygen analyzer, COM-7456, can be used to do a check of
the NGS oxygen sensor or if you suspect the NGS oxgyen sensor may be bad.
(2) This task has these functional tests:
(a) Functional Test for the Nitrogen Generation System - NGS PERF LO FLOW.
(b) Functional Test for the Nitrogen Generation System - NGS PERF HI FLOW.
B. References
Reference Title
21-00-00-800-804 Remove Conditioned Air Supplied by a Cooling Pack (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)
47-21-00-700-802 Drain Cap - Fuel Leak Check (P/B 601)
47-31-02-740-805 Other Function Menu (P/B 201)
49-11-00-860-802 APU Usual Shutdown (P/B 201)
C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
COM-7456 Analyzer - Oxygen
737-600, -700, -800
Part #: MODEL 111B Supplier: 1UM84
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 501
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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