Which performance numbers are controlling for performance calculations, FMS or flight release?

Which performance numbers are controlling for performance calculations, FMS or flight release?

• A. FMS
• B. Flight release
• C. Both
• D. Neither

Answer: (B)

The numbers that control performance calculations are the flight release. This document carries the official, approved data for that flight—things like weight, balance, weather assumptions, runway requirements, and performance limits. It tells you what you’re actually permitted to use when calculating takeoff and landing performance, engine thrust settings, climb gradients, and required runway lengths. The FMS is a powerful onboard tool that uses its own performance data to perform calculations and assist with navigation and optimization. It does not override the official numbers in the flight release. If the FMS shows something different, you must rely on the flight release for the controlling data, since it represents the validated, authorized figures for that flight. So, while the FMS supports your calculations, the flight release is the source of truth for performance calculations.

The numbers that control performance calculations are the flight release. This document carries the official, approved data for that flight—things like weight, balance, weather assumptions, runway requirements, and performance limits. It tells you what you’re actually permitted to use when calculating takeoff and landing performance, engine thrust settings, climb gradients, and required runway lengths.

The FMS is a powerful onboard tool that uses its own performance data to perform calculations and assist with navigation and optimization. It does not override the official numbers in the flight release. If the FMS shows something different, you must rely on the flight release for the controlling data, since it represents the validated, authorized figures for that flight.

So, while the FMS supports your calculations, the flight release is the source of truth for performance calculations.