The INTERIM POWER pushbutton switch allows for selection of interim power at what percentage of mast torque and engine speed (Nr)?

The INTERIM POWER pushbutton switch is designed to assist in providing additional power for specific flight conditions by allowing the pilot to select interim power limits for both mast torque and engine speed. The correct parameters for interim power settings are 117% mast torque and 104% Nr.

Mast torque refers to the amount of rotational force the engine is generating to turn the rotor blades, while Nr pertains to the rotor speed in revolutions per minute. Utilizing the INTERIM POWER setting effectively increases these limits temporarily, granting the pilot more power to maneuver or respond to demanding flight situations.

Setting the mast torque to 117% means that the rotor system can deliver greater force than the standard operational limit, while maintaining the engine speed at 104% allows for an increased rotor speed without surpassing safety margins. This configuration ensures that the aircraft can handle more demanding situations without risking engine failure or rotor system integrity, making it crucial for tactical operations and emergency responses.

The selected parameters in this option balance the need for additional power while still operating within safe and effective limits for the helicopter's systems.