The permanent magnet alternator (PMA) provides power to the FADEC at and above which percentage of N2?

The correct answer is that the permanent magnet alternator (PMA) provides power to the Full Authority Digital Engine Control (FADEC) at and above 45% N2. The PMA is designed to generate electrical power reliably during the operation of the engine, specifically at a point when the engine has reached a sufficient level of speed to ensure stable power generation.

At 45% N2, the engine is typically reaching a state where it can produce the necessary airflow and rotational speed for the PMA to effectively generate electricity. This is crucial for the operation of FADEC, which manages engine parameters and ensures optimal performance.

The significance of the 45% threshold lies in the engineering design that prioritizes safety and performance reliability. By ensuring that the PMA operates effectively in the mid-range of N2 speed, systems relying on electric power can function correctly and efficiently during engine startup and operation phases.