What speed should be maintained for an emergency descent in the Envoy 175?

The correct speed to be maintained for an emergency descent in the Envoy 175 is 250 KIAS (Knots Indicated Airspeed). This speed is selected because it allows for a rapid and efficient altitude loss while ensuring the aircraft remains well within its structural limits. Maintaining this speed provides the best compromise between descent rate and control, allowing the pilots to manage the aircraft effectively during an emergency situation.

The choice of 250 KIAS is also in line with standard procedures for high-speed descents in many commercial aircraft, as it is a speed that prioritizes safety while maximizing the rate of descent. This speed helps to ensure that the aircraft maintains adequate control authority during the descent, which is critical for effective handling in emergency scenarios where prompt action is necessary.

Other speeds, while they may be relevant in different contexts or phases of flight, do not provide the same combination of rapid descent capability and safety margin as the 250 KIAS option. Therefore, maintaining this speed is crucial for responding effectively during an emergency descent.