Engine-out indicators are signaled by which of the following?

Engine-out indicators are signaled by which of the following?

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

Answer: (C)

Engine-out signaling relies on noticing how multiple engine parameters respond when one engine loses power. In the UH-60, the indicators used to flag an engine-out condition involve turbine temperature (TGT), gas generator speed (NG), and the power turbine speed (NP). When an engine fails or underperforms, the readings in all three areas change in a characteristic way: TGT tends to rise due to altered air-fuel balance and increased load on the remaining systems, while NG and NP on the affected engine drop away from normal operation—often moving toward half their normal values as the engine can no longer contribute expected power. Because a single parameter can be influenced by many factors other than an engine-out event, using the combination of TGT, NG, and NP 1/2 provides a reliable indication that an engine-out condition is present. That’s why this option is the best choice.

Engine-out signaling relies on noticing how multiple engine parameters respond when one engine loses power. In the UH-60, the indicators used to flag an engine-out condition involve turbine temperature (TGT), gas generator speed (NG), and the power turbine speed (NP). When an engine fails or underperforms, the readings in all three areas change in a characteristic way: TGT tends to rise due to altered air-fuel balance and increased load on the remaining systems, while NG and NP on the affected engine drop away from normal operation—often moving toward half their normal values as the engine can no longer contribute expected power. Because a single parameter can be influenced by many factors other than an engine-out event, using the combination of TGT, NG, and NP 1/2 provides a reliable indication that an engine-out condition is present. That’s why this option is the best choice.