6
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SECTION 7 CESSNA
,L.
AIRPLANE AND SYSTEMS DESCRIPTION MODEL
2088
(675 SHP)
STARTING SYSTEM
,:
1
The starting system consists of a starter-generator, a starter switch,
,
..
and a starter annunciator light. The starter-generator functions as a
motor for engine starting and will motor the gas generator section until
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a speed of 46% Ng ,is reached, at which time, the start cycle will
automatically be
termmated by a speed sensing switch located in the
1
starter-generator. The starter-generator is controlled by a three-
positioned starter switch located on the left sidewall switch and circuit
breaker panel. The switch has OFF, START, and MOTOR positions.
I
The OFF position deenergizes the ignition and starter circuits and is the
normal position at all times except during engine start. The START
position of the switch energizes the starter-generator which rotates the
gas generator portion of the engine for starting. Also, the START
position energizes the ignition system, provided the ignition switch is in
the NORMAL position. When the engine has started, the starter switch
must be manually placed in the OFF position to de-energize the ignition
system and activate the generator system. The MOTOR position of the
switch motors the engine without having the ignition circuit energized
and is used for motoring the engine when an engine start is not desired.
This can be used for clearing fuel from the engine, washing the engine
compressor, etc. The MOTOR position is spring-loaded back to the
OFF position. Also, an interlock between the MOTOR position of the
starter switch and the ignition switch prevents the starter from motoring
unless the ignition switch is in the NORMAL position. This prevents
unintentional motoring of the engine with the ignition on. Starter
contactor operation is indicated by an amber annunciator, labeled
STARTER ENERGIZED, on the annunciator panel.
ENGINE ACCESSORIES
All engine-driven accessories, with the exception of the propeller
tachometer-generator and the propeller governors, are mounted on the
accessory gearbox. located at the rear of the engine. These
accessories are driven from the compressor turbine by a coupling shaft
which extends the drive through a conical tube in the oil tank center
section.
(Continued Next Page)
Revision
23
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