When using the TRNG switch, the idled engine spools down to ____ RPM N2 at a preprogrammed rate and the good engine will increase power up to approximately ____% torque.

When using the TRNG switch, the idled engine spools down to ____ RPM N2 at a preprogrammed rate and the good engine will increase power up to approximately ____% torque.

• A. 340 RPM; 60% Torque
• B. 320 RPM; 70% Torque
• C. 300 RPM; 62% Torque
• D. 320 RPM; 62% Torque

Answer: (D)

When TRNG is engaged, the helicopter is placed in a controlled engine-out training scenario: the idled engine is allowed to spool down to a specific idle N2, and the remaining engine is commanded to supply additional torque to keep the rotor system stable. In this setting, the idled engine will reach 320 RPM N2 at the preprogrammed rate. The good engine will increase to about 62% torque to compensate, providing enough power to hold the aircraft in level flight or at a safe maneuvering margin during the simulated loss of one engine. This combination—320 RPM N2 on the idle engine and approximately 62% torque on the good engine—represents the standard TRNG setting described in the training and maintenance literature. The other options either set a different idle N2 or a torque level that would not produce a realistic or safe engine-out response for training.

When TRNG is engaged, the helicopter is placed in a controlled engine-out training scenario: the idled engine is allowed to spool down to a specific idle N2, and the remaining engine is commanded to supply additional torque to keep the rotor system stable. In this setting, the idled engine will reach 320 RPM N2 at the preprogrammed rate. The good engine will increase to about 62% torque to compensate, providing enough power to hold the aircraft in level flight or at a safe maneuvering margin during the simulated loss of one engine. This combination—320 RPM N2 on the idle engine and approximately 62% torque on the good engine—represents the standard TRNG setting described in the training and maintenance literature. The other options either set a different idle N2 or a torque level that would not produce a realistic or safe engine-out response for training.