SUBTASK 47-21-00-020-003
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.
(6) Open these access panels:
Number Name/Location
192BL ECS Ram Air Inlet Mixing Duct Panel - Forward
192CL ECS Access Door
H. Test Equipment Installation - Center Tank
SUBTASK 47-21-00-020-004
(1) Remove the primary backflow prevention check valve (TASK 47-21-04-000-801).
NOTE: Do not loosen the NEADS tube when the primary backflow check valve is removed.
SUBTASK 47-21-00-480-001
(2) Install the cap assembly (pressure test equipment, SPL-7455) on the NEADS tube.
I. Test Equipment Installation - Drain Port
SUBTASK 47-21-00-923-001
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.
(1) Obey the nitrogen generation system precautions when you install the pressure test
equipment, SPL-7455.
SUBTASK 47-21-00-680-002
(2) Drain fuel from the drain port (TASK 47-21-00-700-802).
SUBTASK 47-21-00-480-003
(3) Connect the pressure test equipment, SPL-7455, to the drain port.
(a) Apply Nitto P-412 tape, G50310, or Nitto P-421 tape, G00150, to the threads on the drain
port.
(b) Connect the hose assembly to the drain port.
J. Air Pressure Leak Check
SUBTASK 47-21-00-480-002
(1) Connect the pressure test equipment, SPL-7455, to a 0-30 psig dry filtered regulated air
source, STD-1280.
SUBTASK 47-21-00-780-002
(2) Use the 0-30 psig dry filtered regulated air source, STD-1280, to apply 22 psig (152 kPa) to the
NEADS line.
SUBTASK 47-21-00-780-011
(3) Use the 0-30 psig dry filtered regulated air source, STD-1280, to apply 20 psig (138 kPa) to the
NEADS line, then use the leak detector, G50135, compound to do a check for leaks at these
components:
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-00
Page 606
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 405,
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707-710, 803-813, 821, 822, 831, 832, 836, 837, 841, 842, 851, 852, 854-858, 861-863,
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