S = negative sign for negative values of temperature
G. Leak Check of the Nitrogen Generation System
SUBTASK 47-00-00-790-003
(1) Do a check for leaks at the joints of these components:
(a) Thermal Control Unit (TCU)
(b) Air Separation Module (ASM)
(c) Oxygen-Enriched Air (OEA) duct
SUBTASK 47-00-00-790-006
(2) If you find a leak, do these steps:
(a) Position your hand 12 in. (30 cm) above the leak source.
(b) If you can feel the airflow, then stop the operation of the NGS system and repair the leak
immediately.
(c) If you cannot feel the airflow, then the leak is permitted.
(d) Several small leaks are permitted, if all the leaks are not concentrated in one area.
SUBTASK 47-00-00-360-001
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.
WARNING
DO NOT BREATHE THE AIR FROM THE FUEL TANK UNTIL YOU MAKE IT
SAFE. THE NITROGEN GENERATION SYSTEM DECREASES THE OXYGEN
IN THE AIR. IF YOU BREATHE AIR THAT DOES NOT HAVE SUFFICIENT
OXYGEN, DANGEROUS HEALTH CONDITIONS CAN QUICKLY OCCUR.
DANGEROUS HEALTH CONDITIONS INCLUDE NAUSEA,
UNCONSCIOUSNESS, AND CONVULSIONS. IF THE OXYGEN LEVEL OF
THE AIR THAT YOU BREATHE IS VERY LOW, IT CAN KILL YOU.
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.
(3) To repair 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.
NOTE: When the valve is closed, the hole in the manual locking arm aligns with the hole
on the valve body, and you can insert the locking pin. If the valve is not fully
closed, the holes will not align, and you cannot fully insert the locking pin.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 604
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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