SUBTASK 47-31-02-740-040
(3) When DISPLAY TEST? shows, push the YES button.
NOTE: The BDU will do a 10 second test display routine. All of the buttons are disabled
except for the MENU button.
(a) Push the MENU button to stop the test.
SUBTASK 47-31-02-740-041
(4) Procedures are supplied to do the BDU ground tests. These are the tasks:
(a) Electrical Test: Ground Operation of the Nitrogen Generation System,
TASK 47-00-00-800-801
(b) System Test: Ground Operation of the Nitrogen Generation System,
TASK 47-00-00-800-801
G. BDU Test in Progress
SUBTASK 47-31-02-740-042
(1) Make sure that the applicable ground test item shows.
(a) Push the YES button to start the ground test.
SUBTASK 47-31-02-740-098
(2) TEST IN PROGRESS shows on the first line of the message display.
(a) The second line of the display shows this data:
1) For the electrical test:
XXX% COMPLETE
2) For the system test
XXX% COMPLETE
(3) For the NGS PERF LO FLOW:
• GSE O2 SNS: ZZZZZ
• P: XX PSIA T:SYYYF
(4) For the NGS PERF HI FLOW:
• GSE O2 SNS: ZZZZZ
• P: XX PSIA T:SYYYF
SUBTASK 47-31-02-740-099
(5) To stop the test, push the MENU or ON/OFF buttons.
SUBTASK 47-31-02-740-100
(6) The NGS controller will not start the test (inhibited) if there is an incorrect aircraft configuration.
If the test is inhibited, one of these inhibited list items will show:
(a) SYS PRESS LOW/INVLD
(b) PACK OFF
(c) REFUEL VLV OPEN
(d) A/C ID INVALID
(e) WOW = IN AIR
(f) SEE EXISTING FAULTS
NOTE: The NGS controller has detected a fault that you must repair before you can do
the test.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-31-02
Page 236
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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