Starting System; Engine Accessories - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

CESSNA SECTION 7
MODEL 208B 867 SHP AIRPLANE AND SYSTEMS DESCRIPTION
GARMIN G1000

STARTING SYSTEM

The starting system consists of a starter-generator, a starter switch,
and an amber STARTER ON annunciator. The starter-generator
functions as a motor for engine starting and will motor the gas
generator section until a speed of 46% N is reached, at which time, the
g
start cycle will automatically be terminated by a speed sensing switch
located in the 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. 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 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
STARTER ON annunciator.

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.
208BPHCUS-00 7-67
U.S.