Table 501/80-11-00-993-801-F00
ENGINE START SWITCH POSITION COLUMN F ROW 9 COLUMN C ROW 14
OFF O O
GRD G O
CONT G O
FLT O G
ILF 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 533, 535, 537, 562
1) The AUTO position is off.
ILF ALL
2) Move the start switch to the other positions in the table and do the above steps
again to record the values.
3) The CDU screen updates once per second. The status of the discrete may take as
long as two seconds to update.
4) G is for ground, O is for open, V is for 28 VDC, X is for invalid and - is for no
discrete.
(e) Push the INDEX LSK until the CDS BITE INDEX shows.
1) Do the steps again to examine the other DEU, DEU 1 or DEU 2.
(f) If the values agree, then the engine start switch circuit is satisfactory from the switch to
the DEUs (SSM 74-31-11).
(g) If the values do not agree and you find an O when a G is expected, then look for an open
circuit in the switch or on the wire and connector between the engine start switch and the
DEU.
(h) If the values do not agree and you find an G when an O is expected, then look for a short
to ground in the switch, or on the wire and connector between the engine start switch and
the DEU.
SUBTASK 80-11-00-860-014-F00
(5) Do a wiring check of the applicable engine start switch.
(a) For engine 1, open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-2
Row Col Number Name
A 1 C00458 ENGINE 1 IGNITION RIGHT
A 3 C00153 ENGINE 1 IGNITION LEFT
A 4 C01390 ENGINE 1 ALTN PWR CHAN B
A 5 C01314 ENGINE 1 ALTN PWR CHAN A
(b) For engine 2, open these circuit breakers and install safety tags:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 4 C00459 ENGINE 2 IGNITION RIGHT
D 6 C00151 ENGINE 2 IGNITION LEFT
D 7 C01391 ENGINE 2 ALTN PWR CHAN B
D 8 C01315 ENGINE 2 ALTN PWR CHAN A
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
CFM56 ENGINES (CFM56-7)
80-11-00
Page 503
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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