The safety feature built into the training switch FADEC logic ensures that the idled engine will provide power up to the actual ______ stop in the event of NR mismanagement.

• A. NR mismanagement
• B. IDLE
• C. NR mode
• D. OEI

Answer: (D)

The safety feature is a protective limit in the FADEC that clamps engine output to the actual OEI stop when NR is mismanaged. This means that if rotor speed (NR) isn’t being tracked correctly, the idled engine can still produce power, but only up to the one-engine-inoperative (OEI) limit. This boundary helps prevent rotor-speed or thrust excursions that could occur if the engine were allowed to push beyond safe levels while one engine is not contributing or NR is mismanaged. The other terms describe states or conditions (NR mismanagement, idle, NR mode) rather than the limiting value itself, so the OEI stop is the correct descriptor of the safety boundary.