Engine Ignition Procedures
For most operations, the ignition switch should be left in the OFF position.
With the switch left in the OFF position, the igniters will automatically be
excited when the starter switch is in the HI START position.
However, the ignition switch should be turned ON to provide a continuous
source of ignition during the following conditions:
a. Operation on water or slush covered runways.
b. Flight into heavy precipitation.
c. During inadvertent encounters of icing conditions, until the inertial air
particle separator has been left on for at least 5 minutes. Refer to
“Section 3” of this manual for more information.
d.
When the RESERVOIR FUEL annunciator is illuminated, indicating a
near fuel exhaustion condition.
Refer to “Section 7” of this manual for further information regarding the
ignition system.
Engine Inlet – Inertial Separator Procedures
Installed in the engine air inlet duct is an inertial air particle separator (inertial
separator). The inertial separator system is provided to prevent ice buildups
on the compressor inlet screen while operating in icing conditions, and
to minimize the ingestion of foreign particles during ground operations or
takeoffs with dusty, sandy eld conditions.
The inertial separator (switch labeled ENG INLET) should be placed in
BYPASS mode prior to operating the engine on the ground, or in ight when
the outside air temperature (OAT) is less than 5°C and visible moisture
(clouds, rain, snow or ice crystals) is present.
The inertial separator should also be placed in the BYPASS mode for ground
operations and takeoffs in dusty or sandy eld conditions, to help minimize
engine ingestion of dust, sand and debris.
The NORMAL mode should be selected for all other engine operating
conditions, since it provides a substantial inlet ram recovery, resulting in
more efcient engine operation. Refer to “Section 7” of this manual for more
information concerning the inertial air particle separator.
Aircraft Serial Numbers 100-0043 and up, and airplanes equipped with Ice
Protection Systems, are also equipped with an additional override actuator,
referred to as a “Dual Actuated Inertial Particle Separator.” See “Section 7” of
this manual for more information.
NOTE: Leaving the ignition switch in the ON position for extended periods
of time will reduce the life of the ignition system components.
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