(d) Make sure that the valve goes to the CLOSED position.
(e) Examine the connections to do a check for leak(s).
(f) Repair the leaks that you find.
(g) Make sure that the parts align correctly.
SUBTASK 47-00-00-790-007
(4) Pressurize the pneumatic system (TASK 36-00-00-860-801).
(a) Do the leak check again to make sure that you repaired the problem.
SUBTASK 47-00-00-790-004
(5) Push the YES button to start the applicable test.
SUBTASK 47-00-00-790-010
(6) Do a check for leaks at the NGS switches, sensors, and sense lines:
(a) Apply a small quantity of leak detector, G50135, to the applicable switch, sensor or sense
line connection.
(b) Examine the component 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 leaks are permitted.
(d) Use a clean cotton wiper, G00034, to remove the leak detector, G50135.
SUBTASK 47-00-00-360-002
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.
(7) 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) Look at the manual locking hex bolt on the NGS shutoff valve.
1) Make sure that the slot goes to the CLOSED position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 605
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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