Which function is NOT a typical responsibility of the Flight Management System on the Boeing 787?

Which function is NOT a typical responsibility of the Flight Management System on the Boeing 787?

• A. Optimizing routes and performance
• B. Providing input to autopilot guidance
• C. Managing navigation data and performance calculations
• D. Generating weather forecasts for the flight deck

Answer: (D)

The key thing the Flight Management System does is calculate and optimize the flight path using the navigation database, then use that trajectory to guide the aircraft. It determines the best route, climb and cruise speeds, altitude profiles, and fuel burn, and it keeps track of waypoints, airways, and procedures. It then feeds those calculated targets to the autopilot so the aircraft follows the intended path with the right lateral and vertical guidance. Weather forecasts, however, are not produced by the FMS. Forecasts come from meteorological systems and weather services, and while the FMS may use weather data to help optimize routing, it does not generate weather forecasts for the flight deck. Therefore, generating weather forecasts is not a typical responsibility of the FMS.

The key thing the Flight Management System does is calculate and optimize the flight path using the navigation database, then use that trajectory to guide the aircraft. It determines the best route, climb and cruise speeds, altitude profiles, and fuel burn, and it keeps track of waypoints, airways, and procedures. It then feeds those calculated targets to the autopilot so the aircraft follows the intended path with the right lateral and vertical guidance.

Weather forecasts, however, are not produced by the FMS. Forecasts come from meteorological systems and weather services, and while the FMS may use weather data to help optimize routing, it does not generate weather forecasts for the flight deck. Therefore, generating weather forecasts is not a typical responsibility of the FMS.