The cowl contains and protects the engine components. The cowl also
controls the airflow through and around the engine.
The engine cowl has four parts:
• Inlet cowl
• Fan cowl
• Thrust reverser

• Turbine exhaust system.


The inlet cowl controls the airflow into the engine fan. The inlet cowl is a
single assembly with an upper and a lower half. The inlet cowls for the left
and the right engines are interchangeable. The cowl includes these
components:
• T12 sensor
• Engine antiice (EAI) system
• Powered door opening system (PDOS) actuation and control switches
• Hoist points.


The T12 sensor measures engine inlet temperature and sends it to the EEC.


Each engine has two fan cowls. The fan cowls let the air flow smoothly
around the engine.

The left fan cowl has an oil tank access door and a pressure relief door. You
service the engine oil tank through the oil tank access door.


The thrust reverser controls the direction of the fan exhaust. It makes
forward or reverse thrust. Reverse thrust can decrease the speed of the
airplane during landing rollout or rejected takeoff. The surface of the thrust
reverser lets air flow smoothly around the engine.


The turbine exhaust system makes the airflow smooth as it exits the engine.
This increases engine efficiency and reduces noise.
It contains primary nozzle, center body and vent tube extension.


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