Which statement correctly describes the engine rating plug?

• A. Permanently connected to the EEC
• B. Connected to the EPR transmitter
• C. Permanently connected to the engine casing
• D. Connected to the FADEC

Answer: (C)

The engine rating plug is a fixed hardware device that sets or locks in the engine’s maximum operating rating. It is part of the engine’s structure and is permanently mounted into the engine casing. Because it is a mechanical, non-electrical component that stays with the engine, it isn’t connected to electronic control systems like the EEC or FADEC, nor is it part of the EPR transmitter circuit. Its purpose is to establish the rated state of the engine through a permanent installation, and changes to it require a maintenance action rather than normal operation. That’s why the statement about it being permanently connected to the engine casing is the correct description.