FSD International
Commander 115 TC
Pilot Operating Handbook
- 50 –
Copyright© 2008 by FSD International. All rights reserved.
For use with Microsoft Flight Simulator only. Not to be used for real-world aviation.
6.6 EXHAUST SYSTEM
The engine is equipped with a cross-over exhaust system feeding a single tailpipe which protrudes.
through the lower right cowling at the firewall. Exhaust stacks are flange-mounted to each cylinder
exhaust port and collect at the muffler assembly which lays across below the forward engine area.
A heat shroud is fitted around the muffler to provide a source of heated air for the cabin heater and
defroster systems.
6.7 FUEL INJECTION SYSTEM
Filtered air is introduced into the engine through the servo regulator body, then flows into an air
intake riser where it is distributed to each cylinder by individual intake pipes. The amount of air
entering the engine is controlled by a throttle valve (butterfly) contained in the body of the fuel
injection servo regulator. Fuel is metered and distributed to the individual cylinders by the servo
regulator and fuel flow divider valve. The fuel-air ratio is determined by the position of the throttle
valve and air sensing functions of the servo regulator. Fuel and air are mixed within the cylinder.
The fuel injection system consists of the air flow sensing and fuel control sub-systems. Components
of the injection system are: the servo valve, fuel control unit, fuel flow divider valve, and air
bleeder nozzles. The servo valve and fuel control unit are contained within the throttle body
casting, installed on the engine intake manifold air inlet. Priming is provided by the fuel injection
system. A separate priming system is not required.
6.9 ENGINE COOLING SYSTEM
COWLING - The cowling consists of two molded fiberglass assemblies which have contoured inlets
to control expansion of cooling air as it enters, a fixed opening around the tailpipe, and a single
cowl flap on the left lower side of the cowl to control airflow through the cooling system. The cowl
flap position is controlled by the pilot using the cowl flap control lever on the center console.
BAFFLE INSTALLATION - Sheet metal baffles are installed on the engine to provide optimum
cooling airflow around the engine cylinders and accessory components. Ductwork is provided off
the aft right baffle to direct cooling air to the oil cooler. Silicon rubber seals are used to stop air
leaks where the inner cowl surfaces meet the baffles and assure that the cooling air moves
properly. These baffles, seals, and ducts are carefully designed and positioned to maintain proper
cooling efficiency. Their alteration or damage will cause improper air circulation and engine
overheating.
6.10 STARTER
A light weight Lycoming starter is installed on the lower left front side of the engine. The starter
drive pinion engages the engine flywheel ring gear to provide direct cranking of the engine. The
starter relay, installed on the battery box in the tail cone, is energized by a key-operated, spring-
loaded ignition starter switch. When starting the engine, avoid energizing the starter for more than
30 seconds, and allow at least 5 minutes between cranking periods to permit the starter to cool.