SUBTASK 24-21-81-860-004
(3) Close applicable circuit breaker:
(a) Remove the safety tags and close these circuit breakers:
F/O Electrical System Panel, P6-4
Row Col Number Name
F 10 C01283 GENERATOR CONT UNIT 1
F 11 C01284 GENERATOR CONT UNIT 2
F 12 C01285 GENERATOR APU GEN CONT UNIT
Power Distribution Panel Number 2, P92
Row Col Number Name
C 9 C01326 APU GEN CONT UNIT
G. Installation Test of the GCU
SUBTASK 24-21-81-700-002
(1) Do a test of the GCU as follows:
(a) Connect the external electrical power source to the airplane (TASK 24-22-00-860-813).
(b) Make sure the STANDBY POWER switch on the P5-5 panel is set to the AUTO position.
(c) Set the BAT switch on the P5-13 panel to the ON position.
(d) Push the GCU TEST switch on the GCU for at least one second.
(e) Make sure all seven of the indicator lights on the GCU come on for approximately three
seconds.
(f) Make sure all seven of the indicator lights on the GCU go off for approximately three
seconds.
(g) Make sure the green GCU PASS light on the GCU comes on for approximately seven
seconds.
ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 402, 405, 406, 409,
410, 412, 416, 424, 425, 427-429, 451, 452, 491-504, 507-510, 512-516, 518-520, 523-528, 530-533,
535-537, 541, 542, 552-557, 559-561, 563, 564, 567-569, 571-577, 581, 583, 585, 589, 590, 597-599,
601-603, 606, 607, 610-615, 620, 625-627, 671, 672, 691-699, 703, 803-813, 821, 822, 831, 832,
835-838, 841, 842, 851, 852, 857, 858, 947, 948, 968-973, 980-999
SUBTASK 24-21-81-210-001
(2) If the TR UNIT and ELEC lights on the P5-13 panel are on do the steps that follow:
NOTE: If either GCU 1, G10 or GCU 2, G12 is replaced with only battery power supplied (no
power on the 115 VAC TRANSFER BUSES) and the STANDBY POWER switch in the
AUTO position, the TR UNIT and ELEC lights on the P5-13 panel will come on.
(a) The TR UNIT light will go off after the GCU's are installed and their associated circuit
breakers are closed.
(b) The ELEC light will remain on until you clear the BAT CHGR INOP or AUX BAT CHGR
INOP message.
1) To clear the BAT CHGR INOP or AUX BAT CHGR INOP message, do this task:
P5-13 ELEC light Message BITE Procedure (FIM 24-31 TASK 801).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-21-81
Page 410
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
To Next Page
Loading...
