With engine anti ice activated how much maximum Q available should be produced?

With engine anti ice activated how much maximum Q available should be produced?

• A. 0%
• B. -5%
• C. -20%
• D. +10%

Answer: (C)

Engine anti-ice uses bleed air to heat surfaces, which reduces the engine’s available power. To protect the engine and maintain safe operation, the maximum torque the engine can deliver is lowered when anti-ice is on. The UH-60S performance data specify a 20% reduction in maximum Q with anti-ice activated. So the maximum Q available is 80% of the normal maximum, i.e., a -20% change. This reflects how anti-ice draws power from the engine and limits torque. The other options would imply no change or a gain, which isn’t consistent with anti-ice operation.

Engine anti-ice uses bleed air to heat surfaces, which reduces the engine’s available power. To protect the engine and maintain safe operation, the maximum torque the engine can deliver is lowered when anti-ice is on. The UH-60S performance data specify a 20% reduction in maximum Q with anti-ice activated. So the maximum Q available is 80% of the normal maximum, i.e., a -20% change. This reflects how anti-ice draws power from the engine and limits torque. The other options would imply no change or a gain, which isn’t consistent with anti-ice operation.