Altitude loss with the Training Mode is greater than with an actual engine failure due to FADEC derated limits which are used to prevent:

• A. Exceedance of MGB limits
• B. Hard landings
• C. Use of actual OEI power
• D. Excessive NR droop

Answer: (C)

In Training Mode, FADEC derates are applied to prevent tapping into the full power that would be available in an actual one-engine-inoperative (OEI) situation. This safety limit keeps the helicopter from using the true OEI power while you’re simulating an engine-out, protecting the drivetrain and rotor systems during training.

Because you’re not allowed to use that full OEI power, the remaining engine can’t deliver as much thrust as it would in a real OEI event. That extra, actual OEI power would help you hold altitude better, so with the derated limits, the helicopter tends to lose more altitude under the same handling. The purpose of these derated limits is specifically to prevent using actual OEI power, making option about preventing actual OEI power the best explanation. The other concerns—exceeding MGB limits, hard landings, or excessive NR droop—are not the primary reason for this derating in Training Mode.