SUBTASK 47-00-00-210-003
(9) Do an inspection of the NEADS lines between the ASM and the flame arrestor at the rear spar
for damage.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions, TASK 47-00-00-910-802,
for important information on airworthiness limitation instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-07.
SUBTASK 47-00-00-790-005
(10) Do these steps to do a check for leaks in the NEADS lines between the ASM and the flame
arrestor at the rear spar.
(a) Apply a small quantity of leak detector, G50135, to the applicable coupling or drain line
connection.
(b) Examine the NEADS coupling or connection for a leak.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-07.
(c) No air leaks are permitted.
(d) Use a clean cotton wiper, G00034, to remove the leak detector, G50135.
SUBTASK 47-00-00-360-003
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.
WARNING
WHEN YOU DO A TEST OF THE SYSTEM, MAKE SURE THAT THERE IS
SUFFICIENT AIRFLOW IN THE AREA. USE LIFE SUPPORT EQUIPMENT IF
YOU THINK THAT THERE IS A HIGH NITROGEN CONCENTRATION. LOW
OXYGEN LEVELS IN THE AIR ARE DANGEROUS TO PERSONNEL.
CAUTION
TO STOP THE GROUND TEST, PUSH THE MENU BUTTON THEN THE NO
BUTTON ON THE BDU. IF THE SHUTOFF VALVE STAYS OPEN, DAMAGE TO
EQUIPMENT CAN OCCUR.
(11) If you find a leak, do these steps:
(a) Push the MENU button, then the NO button, on the BDU.
(b) Do the steps in this task to depressurize the ECS air supply system: Remove Pressure
from the Pneumatic System, TASK 36-00-00-860-806.
(c) Examine the manual locking arm on the NGS shutoff valve.
1) Make sure that the valve goes from the OPEN position to the CLOSED position.
2) Replace the NGS shutoff valve if the valve fails to close
(PAGEBLOCK 47-32-01/401).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 607
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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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,
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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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