Which description correctly describes the Digital Electronic Control (DEC) in this system?

• A. It is a solid-state device mounted below the compressor casing, powered by the alternator or AC airframe power, and cooled by airflow through the scroll case
• B. It is a hydraulic control unit located in the engine bay
• C. It is a simple electrical switch in the cockpit
• D. It is located in the tailcone and uses an insulation blanket

Answer: (A)

The Digital Electronic Control is the solid‑state engine control unit that governs how the engine runs by processing sensor data and commanding the fuel system and other actuators. It’s placed beneath the compressor casing so it can monitor engine parameters directly and stay within easy reach of cooling air. It’s powered from the aircraft’s electrical system—either the alternator or AC power—so it remains powered as the engine shifts its electrical load. Cooling comes from airflow through the scroll case, which carries heat away from the DEC while the engine is operating. This setup reflects its role as an electronic controller rather than a hydraulic device, a cockpit switch, or a thermal insulation component.