since major overhaul


Also found in: Acronyms.

since major overhaul (SMOH)

A term used in aircraft-for-sale advertisements where the engine hours since the last overhaul was carried out are quoted. Similar terms are TBO (time between overhauls), STOH (since top overhaul), TTSN (total time since new), and TTAF/E (total time airframe/engine).