The short answer
An engine is generally considered high-time as it approaches its TBO — for many piston engines that's roughly 2,000 hours, so an engine in the 1,600–2,000+ hour range is often called high-time, and one at or past TBO is ‘run-out.’ But condition matters as much as the number: a well-maintained, regularly-flown engine can be healthy near TBO.
Hours Relative to TBO
‘High-time’ is relative to the engine's published TBO. For a typical piston engine with a ~2,000-hour TBO, an engine in the upper part of that range (say 1,600–2,000+ hours) is commonly called high-time, and one at or beyond TBO is ‘run-out.’ A ‘mid-time’ engine sits comfortably below TBO with meaningful hours remaining — the sweet spot for buyers and lenders.
Condition vs. Hours
The hour count is only part of the story. How the engine was operated matters enormously: an engine flown regularly, maintained well, with good compressions and oil analysis and no history of sitting idle, can be healthy near TBO — while a low-time engine that sat unused for years may be a poor risk. This is why a pre-buy inspection (with compression and borescope checks) matters more than the raw number. That said, high time still reduces value and can affect financing, so factor the coming overhaul into price.
Figures in this article are illustrative for the 2026 market and are not offers of credit. Jaken Aviation is a licensed aircraft financing brokerage — a division of Jaken Finance Group — and does not make loan decisions. All financing is subject to lender approval. Tax and legal information is general; consult a qualified professional.
Related Questions
Is a high-time engine bad?
Not necessarily — a well-maintained, regularly-flown engine can be healthy near TBO. But high time reduces value and may bring a lender reserve requirement, so reflect the coming overhaul in the price.
Is a low-time engine always better?
Usually, but not if it sat idle for years — disuse can be worse than moderate use. Condition and history matter alongside hours.
How do I check engine condition?
A pre-buy inspection with compression and borescope checks, plus oil analysis and logbook review, reveals far more than the hour count alone.
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