F. BPCU Installation
SUBTASK 24-41-21-010-002
(1) Open this access panel if it is closed:
Number Name/Location
117A Electronic Equipment Access Door
SUBTASK 24-41-21-910-002
CAUTION
DO NOT TOUCH THE CONTROL UNIT BEFORE YOU DO THE PROCEDURE
FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE.
ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CONTROL
UNIT.
(2) Before you touch the BPCU [1], do this task: ESDS Handling for Metal Encased Unit
Installation, TASK 20-40-12-400-802.
SUBTASK 24-41-21-420-001
(3) To install the BPCU [1], do this task: E/E Box Installation, TASK 20-10-07-400-801.
SUBTASK 24-41-21-860-004
(4) Remove the safety tag and close this circuit breaker:
Power Distribution Panel Number 2, P92
Row Col Number Name
A 12 C00936 EXT PWR BPCU
G. BPCU Installation Test
SUBTASK 24-41-21-700-001
(1) Do a test of the BPCU [1] as follows:
(a) Make sure the STANDBY POWER switch on the P5-5 panel is set to the AUTO position.
(b) Set the BAT switch on the P5-13 panel to the ON position.
(c) Push the BPCU TEST switch on the BPCU [1] front panel for at least one second.
(d) Make sure all four of the indicator lights on the BPCU [1] come on for approximately three
seconds.
(e) Make sure all four of the indicator lights on the BPCU [1] go off for approximately three
seconds.
(f) Make sure the green BPCU PASS light comes on for approximately seven seconds.
H. Put the Airplane Back to Its Usual Condition
SUBTASK 24-41-21-410-002
(1) Close this access panel:
Number Name/Location
117A Electronic Equipment Access Door
SUBTASK 24-41-21-860-006
(2) Set the BAT switch on the P5-13 panel to the OFF position.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-41-21
Page 406
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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