With cockpit door gunner heater on, by how much should maximum Q available be reduced?

With cockpit door gunner heater on, by how much should maximum Q available be reduced?

• A. Reduce 2%
• B. No change
• C. Increase 5%
• D. Reduce 5%

Answer: (D)

When the cockpit door gunner heater is on, it adds an appreciable electrical load to the helicopter’s power system. To keep the engine and generator within safe limits, the maximum usable torque (Q) is de-rated by a set amount. The rule in the UH-60S procedures is to reduce maximum Q available by 5% during heater operation. This ensures you don’t exceed electrical or powertrain limits during demanding phases like hover or maneuvering while the heater is consuming power. So you plan with 5% less torque available when the heater is on.

When the cockpit door gunner heater is on, it adds an appreciable electrical load to the helicopter’s power system. To keep the engine and generator within safe limits, the maximum usable torque (Q) is de-rated by a set amount. The rule in the UH-60S procedures is to reduce maximum Q available by 5% during heater operation. This ensures you don’t exceed electrical or powertrain limits during demanding phases like hover or maneuvering while the heater is consuming power. So you plan with 5% less torque available when the heater is on.