Which statement is true about the FMS Speed Module during engine failure?

Which statement is true about the FMS Speed Module during engine failure?

• A. It is required to be used
• B. It is prohibited
• C. It may be used under certain conditions
• D. It is not referenced in procedures

Answer: (B)

During an engine failure, speed management must be manual because the FMS Speed Module relies on data and profiles suited to normal, full-power operation. With one engine inoperative, the degraded performance and altered flight dynamics mean the module can command speeds that are unsafe or inappropriate, risking insufficient climb performance or loss of proper stall margins. Therefore the procedures prohibit using the FMS Speed Module in engine-out conditions, requiring the pilot to set and monitor speeds using established engine-out guidelines and V-speeds instead. The other options imply the module can be used or that it’s optional or not covered, which is not the case in engine-failure procedures.

During an engine failure, speed management must be manual because the FMS Speed Module relies on data and profiles suited to normal, full-power operation. With one engine inoperative, the degraded performance and altered flight dynamics mean the module can command speeds that are unsafe or inappropriate, risking insufficient climb performance or loss of proper stall margins. Therefore the procedures prohibit using the FMS Speed Module in engine-out conditions, requiring the pilot to set and monitor speeds using established engine-out guidelines and V-speeds instead. The other options imply the module can be used or that it’s optional or not covered, which is not the case in engine-failure procedures.