SUBTASK 47-00-00-740-078
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.
(8) To stop the test, push the MENU button on the BDU.
(9) Push the ON/OFF button on the oxygen analyzer, COM-7456, to shut off the power.
I. Functional Test for the Nitrogen Generation System - NGS PERF HI FLOW
NOTE: This procedure does a purity check of the NEA for the ASM (high flow mode).
SUBTASK 47-00-00-720-023
(1) Do not start the NGS PERF HI FLOW test if the ambient temperature is more than 118°F
(48°C).
NOTE: Ground operation of the NGS in high flow mode, with high ambient temperatures, can
cause the system to get too hot.
SUBTASK 47-00-00-740-079
(2) If not done previously, do this task: Ground Operation of the Nitrogen Generation System,
TASK 47-00-00-800-801.
(a) Make sure that you complete and pass the BDU SYSTEM TEST.
(b) Make sure that the BDU shows the NGS PERF HI FLOW during the NGS ground
operation.
(c) Let the NGS warm up for approximately 30 minutes.
NOTE: The system can take up to 30 minutes to warm up in cold ambient temperatures.
Before you begin the function test, make sure the temperature value from the
BDU display is 160 ±10°F (71 ±6°C).
(d) After the NGS is warmed up, push the MENU button on the BDU.
SUBTASK 47-00-00-740-081
(3) Push the YES button on the BDU.
SUBTASK 47-00-00-720-024
(4) Make sure the NGS shutoff valve opens and the functional test starts.
NOTE: The NGS shutoff valve is located in the FWD LH ECS bay between the bleed air inlet
duct and the ozone converter.
(a) Make sure the display on the BDU shows these messages:
1) GSE O2 SNS: XX.X% (or GSE O2 SNS: WARM during warmup mode).
NOTE: XX.X is the O2% reading from the oxygen sensor.
2) P: YY PSIA
NOTE: YY = ASM outlet current pressure.
3) T: SZZZ F
NOTE: ZZZ = ASM inlet current temperature.
S = negative sign for negative values of temperature.
SUBTASK 47-00-00-740-082
(5) Do a check of the NGS temperature:
(a) Record the NGS temperature from BDU using the following messages:
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 505
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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