IGNITION SYSTEM
The ignition system consists of two spark igniters, an ignition exciter, two
high tension leads, an ignition annunciator light, an ignition switch, and a
starter switch. Engine ignition is provided through two igniters located at the
4 o’clock and 9 o’clock positions in the engine combustion chamber. The
igniters are energized by the ignition exciter mounted on a bracket attached
to the left side of the accessory gearbox. Electrical energy is transmitted from
the ignition exciter to the spark igniters via two high tension leads. Normally,
the ignition system is only energized during engine start.
Ignition is controlled by an ignition switch and a starter switch located
on the lower left portion of the instrument panel. The ignition switch has
two positions, ON and OFF. When the ignition switch is placed in the
OFF position, the ignition system will only be activated when HI START is
selected on the starter switch. In this mode of starting, the ignition system
is automatically activated. The ignition system may be manually activated
by selecting the ON position on the ignition switch for LO START operations,
air starts without starter assistance, for operation on water-covered runways,
during operations in heavy precipitation, during inadvertent icing encounters
until the inertial air particle separator has been placed in BYPASS for 5
minutes and when operating near fuel exhaustion as indicated by illumination
of the
RESERVOIR FUEL annunciator.
The main function of the starter switch is to control the operation of the
starter for rotating the gas generator portion of the engine during the starting
process. However, it also controls ignition during starting operations. The
starter switch includes three positions, OFF, HI START and LO/MOTOR. The
OFF and LO/MOTOR positions have no direct effect on the ignition system.
When selected, the HI START position automatically energizes the ignition
system.
An advisory annunciation is provided through the G1000 when electrical
power is being applied to the spark igniters and is displayed as follows:
IGNITION ON
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