FAR 23.2125 — Climb Performance Data
FAR 23.2125 requires manufacturers to determine climb and glide performance data for Part 23 airplanes across weights, altitudes, and temperatures.
FAR 23.2125 is a certification rule that tells airplane manufacturers (the applicant) what climb and glide performance information they must develop and publish for Part 23 small airplanes. As a pilot, this is the source of the climb charts and glide data you find in the Pilot's Operating Handbook (POH).
The applicant must determine climb performance at each weight, altitude, and ambient temperature within the airplane's operating limitations:
- For all single-engine airplanes.
- For levels 1 and 2 high-speed multiengine and level 3 multiengine airplanes, following a critical loss of thrust on takeoff in the initial climb configuration.
- For all multiengine airplanes, during the enroute phase with all engines operating, and after a critical loss of thrust in cruise configuration.
In addition, for single-engine airplanes, the applicant must determine glide performance after a complete loss of thrust.
Why it matters operationally: this rule is why you can plan a takeoff, climb, or engine-out scenario using real, tested numbers instead of guesses — including best glide range if your only engine quits.