Large nontransport category airplanes: En route limitations: One engine inoperative

This regulation sets minimum climb performance requirements for large nontransport category airplanes operating under Part 135 when one engine fails en route.

The standard rule requires the airplane to maintain at least a 50 feet-per-minute climb with the critical engine inoperative at an altitude of either 1,000 feet above the highest obstacle within five miles of the route, or 5,000 feet—whichever is higher.

Alternatively, the FAA may approve a lower altitude if the airplane can clear all obstacles by 1,000 feet while descending (assuming a descent rate 50 fpm worse than published performance data). The FAA evaluates weather reliability, navigation aids, terrain, traffic, and other operational factors before approving this option.

Performance calculations assume the critical engine is out, the propeller feathered for minimum drag, flaps and gear retracted, remaining engines at maximum continuous power, standard atmosphere conditions, and progressively decreasing weight as fuel burns off.

*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.*