Engine out audio and warning indicators are triggered by which combination of engine parameters?

Engine out audio and warning indicators are triggered by which combination of engine parameters?

• A. TGT
• B. NG
• C. TGT, NG, and NP 1/2
• D. NP 1/2

Answer: (C)

Engine-out warnings are based on a triple-parameter check to confirm a true engine failure. The system monitors turbine gas temperature (TGT), gas generator speed (NG), and power turbine speed (NP) for the affected engine. When all three indicators go out of their normal ranges—TGT rising high, NG out of spec, and NP out of spec on the same engine—the engine-out audio and warning indicators are triggered. This combined condition helps prevent false alarms from a single transient spike while ensuring a real loss of engine power is recognized quickly. If any one parameter alone is out of spec, it may be a transient or sensor issue rather than an actual engine-out condition.

Engine-out warnings are based on a triple-parameter check to confirm a true engine failure. The system monitors turbine gas temperature (TGT), gas generator speed (NG), and power turbine speed (NP) for the affected engine. When all three indicators go out of their normal ranges—TGT rising high, NG out of spec, and NP out of spec on the same engine—the engine-out audio and warning indicators are triggered. This combined condition helps prevent false alarms from a single transient spike while ensuring a real loss of engine power is recognized quickly. If any one parameter alone is out of spec, it may be a transient or sensor issue rather than an actual engine-out condition.