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SECTION 7 CESSNA AIRPLANE AND SYSTEMS DESCRIPTION MODEL 208B G1000 STARTING SYSTEM The starting system consists of a starter-generator, a starter switch, and an Amber STARTER ON CAS MSG. The starter-generator functions as a motor for engine starting and will motor the gas generator section until a speed of 46% N g is reached, at which time, the 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 deenergize 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 CAS MSG. 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. 7-56 U.S. 208BPHBUS-00
CESSNA SECTION 7 MODEL 208B G1000 AIRPLANE AND SYSTEMS DESCRIPTION OIL PUMP Pressure oil is circulated from the integral oil tank through the engine lubrication system by a self-contained, gear-type pressure pump located in the lowest part of the oil tank. The oil pump is contained in a cast housing which is bolted to the front face of the accessory diaphram, and is driven by the accessory gear shaft. The oil pump body incorporates a circular mounting boss to accommodate a check valve, located in the end of the filter housing. A second mounting boss on the pump accommodates a pressure relief valve. FUEL PUMP The engine-driven pump is mounted on the accessory gearbox at the 2 o’clock position. The pump is driven through a gear shaft and splined coupling. The coupling splines are lubricated by oil mist from the auxiliary gearbox through a hole in the gear shaft. Another splined coupling shaft extends the drive to the fuel control unit which is bolted to the rear face of the pump. Fuel from the oil-to-fuel heater enters the fuel pump through a 74-micron inlet screen. Then, fuel enters the pump gear chamber, is boosted to high pressure, and delivered to the fuel control unit through a 10-micron pump outlet filter. A bypass valve and cored passages in the pump casing enable unfiltered high pressure fuel to flow from the pump gears to the fuel control unit should the outlet filter become blocked. An internal passage originating at the mating face with the fuel control unit returns bypass fuel from the fuel control unit to the pump inlet downstream of the inlet screen. A pressure regulating valve in this line serves to pressurize the pump gear bushings. N g TACHOMETER-GENERATOR The N g tachometer-generator produces an electric current which is used in conjunction with the gas generator% RPM indicator to indicate gas generator RPM. The N g tachometer-generator drive and mount pad is located at the 5 o’clock position on the accessory gearbox and is driven from the internal scavenger pump. 208BPHBUS-00 U.S. 7-57
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CESSNA INTRODUCTION MODEL 208B G100
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CESSNA SECTION 1 MODEL 208B G1000 G
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CESSNA SECTION 2 MODEL 208B G1000 L
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SECTION 3 CESSNA EMERGENCY PROCEDUR
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SECTION 3 CESSNA ABNORMAL PROCEDURE
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CESSNA SECTION 3 MODEL 208B G1000 A
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CESSNA SECTION 4 MODEL 208B G1000 N
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CESSNA SECTION 5 MODEL 208B G1000 P
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CESSNA SECTION 6 MODEL 208B G1000 W
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Page 387: CESSNA SECTION 7 MODEL 208B G1000 A
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CESSNA SECTION 8 MODEL 208B G1000 H
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