noun
flying on one engine
Aviation term for operating an aircraft with one engine inoperative or shut down.
双発機は片肺飛行でも安全に着陸できるように設計されている。
Twin-engine aircraft are designed to land safely even when flying on one engine.
Compound of 片肺 (one lung) + 飛行 (flight), literally 'one-lung flight', referring to an aircraft flying with one engine out.