Large transport category airplanes: Reciprocating engine powered: En route limitations: All engines operating

This regulation sets minimum climb performance requirements for reciprocating engine-powered large transport aircraft during en route operations when all engines are working normally.

The airplane must be able to maintain a specific climb rate at least 1,000 feet above the highest terrain or obstacle within 10 miles either side of the planned route. The required climb rate is calculated by multiplying the airplane's stall speed in landing configuration (Vso, in knots) by 6.90 to get feet per minute. For example, if Vso is 60 knots, the airplane must climb at least 414 feet per minute.

This requirement ensures the aircraft can safely clear terrain and obstacles along the route while accounting for normal fuel and oil consumption during flight. Operators must verify the airplane's weight at takeoff allows meeting this performance standard throughout the planned route. The regulation doesn't apply to certain older aircraft certificated under earlier Civil Air Regulations.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*