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 (Continued)
2) CPS FREQ = BLANK
NOTE: When the AC voltage goes below approximately 12 VAC, the CPS FREQ
will become blank.
(j) Make sure the DC meter shows this value:
1) DC VOLTS = 0
(k) Set the STANDBY POWER switch on the P5-5 panel to the BAT position.
(l) Make sure the STANDBY PWR OFF light on the P5-5 panel goes off.
(m) Make sure the AC meter shows these values:
1) AC VOLTS = 110-120
2) CPS FREQ = 390-410
(n) Make sure the DC meter shows this value:
1) DC VOLTS = 22-30
(o) Set the STANDBY POWER switch on the P5-5 panel to the AUTO position.
(p) Set the applicable switch(es) on the P5-4 panel to the OFF position:
NOTE: This step is to remove power from the 115 VAC Transfer Buses.
1) GRD POWER control switch
2) APU GEN control switches
3) GEN 1 and GEN 2 control switches
(q) Make sure both TRANSFER BUS OFF lights on the P5-4 panel are on.
(r) Set the DC meter selector switch on the P5-13 panel to the BAT position.
(s) Make sure the DC meter shows these values:
1) DC VOLTS = 22-30
2) DC AMPS = a negative value
NOTE: A negative DC AMP value indicates that the battery is discharging.
(t) Set the DC meter selector switch on the P5-13 panel to the AUX BAT position.
(u) Make sure the DC meter shows these values:
1) DC VOLTS = 22-30
2) DC AMPS = a negative value
NOTE: A negative DC AMP value indicates that the battery is discharging.
(v) Make sure the BAT DISCHARGE light on the P5-13 panel comes on. The light will come
on when any of these conditions are met:
1) The battery current is greater than 5 Amps for more than 95 seconds.
2) The battery current is greater than 15 Amps for more than 25 seconds.
3) The battery current is greater than 100 Amps for more than 1.2 seconds.
(w) Set the applicable switch(es) on the P5-4 panel back to the ON position:
1) GRD POWER control switch
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-34-00
Page 505
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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