The FMS Speed Module in engine failure situations is:

The FMS Speed Module in engine failure situations is:

• A. Permitted
• B. Prohibited
• C. Optional
• D. Required

Answer: (B)

In an engine failure situation, the speed management within the FMS is prohibited. The FMS speed module relies on data from all engines to estimate safe target speeds, and with one engine out the aircraft’s performance becomes asymmetric and highly dynamic. Following the FMS’ automated speed targets under these conditions can lead to inappropriate airspeeds or conflicting guidance with the required one-engine-out climb and thrust settings. To maintain safe performance, you disable or bypass the FMS speed guidance and manage speed manually through thrust and pitch guidance (following the published one-engine-out procedures). This is not optional or required; it’s prohibited because relying on the FMS for speed in an engine-out scenario could compromise safety.

In an engine failure situation, the speed management within the FMS is prohibited. The FMS speed module relies on data from all engines to estimate safe target speeds, and with one engine out the aircraft’s performance becomes asymmetric and highly dynamic. Following the FMS’ automated speed targets under these conditions can lead to inappropriate airspeeds or conflicting guidance with the required one-engine-out climb and thrust settings. To maintain safe performance, you disable or bypass the FMS speed guidance and manage speed manually through thrust and pitch guidance (following the published one-engine-out procedures). This is not optional or required; it’s prohibited because relying on the FMS for speed in an engine-out scenario could compromise safety.