What power setting should be applied if engine power is insufficient to reduce descent below 1500 ft/min?

Choosing to set the power control lever (PCL) to OFF is a response aimed at addressing situations where there is an insufficient power to manage the descent rate effectively, particularly when it exceeds 1500 ft/min. In certain aircraft, reducing the throttle to idle or turning off the power entirely allows the crew to reduce the aircraft's drag and improve the descent rate control, especially during an emergency or when the aircraft is in an uncontrollable state. This action helps to manage the situation, allowing pilots to regain control, configure for a potential emergency landing, or initiate other recovery procedures.

In contrast, options such as increasing torque to 100% would likely exacerbate the situation by maintaining a high power output rather than reducing the descent rate, which is critical in this context. Engaging autopilot may also not be suitable because, in a situation where the descent rate is excessive, the autopilot may not effectively manage the power settings or descent rates as required. Lastly, reducing the throttle to idle would not adequately address the state needed if the engine is already insufficient in power.

Therefore, setting the PCL to OFF is the most appropriate choice considering the operational context, enabling the pilot to take necessary actions to manage the aircraft’s descent effectively.