In an engine failure scenario, which action regarding the FMS Speed Module is correct?

In an engine failure scenario, which action regarding the FMS Speed Module is correct?

• A. Engage and rely on the FMS Speed Module
• B. Use the FMS Speed Module for speed control
• C. Do not use the FMS Speed Module
• D. Reprogram the module

Answer: (C)

In an engine failure, you should not rely on the FMS Speed Module for speed control. The FMS Speed Module delivers a managed speed target based on data from both engines and the flight plan. With one engine inoperative, that reference can become unreliable or unattainable, and trying to follow it could demand thrust from the failed engine or lead to unsafe autothrottle behavior. Instead, manually manage airspeed using selected speed (and the appropriate mode for the autothrottle as your procedure dictates), while focusing on safe energy management with the remaining engine. Reprogramming the module isn’t something you’d do in flight, and engaging it would reintroduce the same unreliable managed-speed guidance.

In an engine failure, you should not rely on the FMS Speed Module for speed control. The FMS Speed Module delivers a managed speed target based on data from both engines and the flight plan. With one engine inoperative, that reference can become unreliable or unattainable, and trying to follow it could demand thrust from the failed engine or lead to unsafe autothrottle behavior. Instead, manually manage airspeed using selected speed (and the appropriate mode for the autothrottle as your procedure dictates), while focusing on safe energy management with the remaining engine. Reprogramming the module isn’t something you’d do in flight, and engaging it would reintroduce the same unreliable managed-speed guidance.