DRAIN CAP - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) Drain Cap Removal
(2) Drain Cap Installation
B. The drain cap is installed below the air separation module (ASM) inside the 192BL ECS bay door.
TASK 47-21-11-000-801
2. Drain Cap Removal
A. References
Reference Title
36-00-00-860-806 Remove Pressure from the Pneumatic System (P/B 201)
47-00-00-010-801 Nitrogen Generation System (NGS) Precautions (P/B 201)
B. Access Panels
Number Name/Location
192BL ECS Ram Air Inlet Mixing Duct Panel - Forward
C. Prepare for Removal
SUBTASK 47-21-11-922-001
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.
WARNING
DO NOT DISCONNECT THE COMPONENTS OF THE NITROGEN
GENERATION SYSTEM, OR DUCTS WHEN THE SYSTEM IS PRESSURIZED.
THE HOT, HIGH-PRESSURE AIR CAN CAUSE INJURIES TO PERSONNEL,
AND DAMAGE TO EQUIPMENT.
CAUTION
MAKE SURE THAT THE MAINTENANCE AREA IS FREE OF CONTAMINATION
FROM SKYDROL, LUBRICANTS, SOLVENTS, FUEL, FUMES, EXHAUST, OR
DUST. DO NOT LET SOLVENTS, LUBRICANTS, OTHER FLUIDS, OR THEIR
FUMES GO INTO THE FLOW PATH TO OR FROM THE AIR SEPARATION
MODULE. CONTAMINATION WILL CAUSE DAMAGE TO THE FIBERS IN THE
AIR SEPARATION MODULE AND DECREASE THEIR LIFE.
(1) Obey the Nitrogen Generation System (NGS) precautions (TASK 47-00-00-010-801).
SUBTASK 47-21-11-864-001
(2) 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 psig (3.45 kPa) or less in the L
and R ducts.
SUBTASK 47-21-11-860-001
(3) 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.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-11
Page 401
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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