OPERATIONS MANUAL

Power Plant
Ignition Control –
GE Model:
Continuous ignition switch
ON Continuous ignition operates.
Sets approach idle limit.
Each engine is equipped with a pair of
igniters, labeled as igniter 1 and igniter 2.
The ignition control on the overhead
panel controls each engine’s igniter pair.
Normally, on each engine, igniter 1 is
powered by AC bus 1, and igniter 2 by
AC bus 3.
Standby power to all igniters is provided
by the main standby bus which uses the
main battery as a backup.
Standby ignition selector (GE)
1 Ignition operates, even if auto
and continuous ignition are
off. The system will energize
both igniters by standby power
if available; otherwise, normal
power will energize igniter 2.
NORM Ignition operates when normal
power to igniter 1 or 2 is lost;
in this case, standby power will
energize both igniters, even if
auto and continuous ignition
are off.
2 Ignition operates, even if auto
and continuous ignition are
off. The system will energize
both igniters by standby power
if available; otherwise, normal
power will energize igniter 1.
Auto ignition selector (GE)
Auto ignition operates in any of the
following cases:
• Flameout is detected.
• Nacelle anti-ice is on.
• Flaps are out of up.
• N2 RPM is below 50% during start.
The description below assumes the
standby ignition selector is set to NORM
and no electrical failures exist:
SINGLE When auto or continuous
ignition operates in flight,
both igniters are energized.
When auto or continuous
ignition operates on the
ground, either igniter 1 or
igniter 2 is energized—the
selection is automatically
swapped before each ground
start.
BOTH When auto or continuous
ignition operates, both igniters
are energized.
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