(d) Examine the component to find the cause of the leak(s).
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.
(e) Repair the problems that you find.
(f) Make sure that the components are aligned.
(g) Tighten the connections.
SUBTASK 47-00-00-790-009
(12) Do the steps in this task to pressurize the pneumatic system: Ground Operation of the
Nitrogen Generation System, TASK 47-00-00-800-801.
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.
(a) Do the leak check again to make sure that you repaired the problem.
SUBTASK 47-00-00-741-007
CAUTION
TO STOP THE GROUND TEST, MAKE SURE YOU PRESS THE MENU
BUTTON ON THE NITROGEN GENERATION SYSTEM BDU. IF YOU DO NOT
PRESS THE MENU BUTTON, THEN THE NGS SHUTOFF VALVE WILL
REMAIN IN THE INCORRECT OPEN POSITION.
(13) To stop the test, push the MENU button, then the NO button, on the BDU.
SUBTASK 47-00-00-741-008
(14) Examine the manual locking arm on the NGS shutoff valve.
(a) Make sure that the valve goes from the OPEN position to the CLOSED position.
H. Depressurize the Pneumatic System
SUBTASK 47-00-00-741-009
(1) To remove the conditioned air supply, do this task:
(a) Remove Conditioned Air Supplied by a Cooling Pack, TASK 21-00-00-800-804.
SUBTASK 47-00-00-741-013
(2) 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.
SUBTASK 47-00-00-741-010
(3) Do a check of the pneumatic duct pressure:
(a) Look at the dual duct pressure gage on the air conditioning panel, P5-10.
(b) Make sure that the L and R duct pressures are 0 psig (0 kPa).
SUBTASK 47-00-00-741-011
(4) To stop the APU, do this task: APU Usual Shutdown, TASK 49-11-00-860-802, if necessary.
SUBTASK 47-00-00-740-072
(5) To stop the engines, do this task: Stop the Engine Procedure (Usual Engine Stop),
TASK 71-00-00-700-819-F00, if necessary.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 608
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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