What Does Smoh Mean In Aviation?

What is SMOH aircraft?

Overhauled ( SMOH or SFOH) An engine that has been completely disassembled (the crank case is split and all the parts pulled out), extensively inspected, and reassembled to either service limits or new limits.

What is the difference between overhaul and rebuilt?

A ” rebuilt ” engine should be put back into like-new condition, with all parts examined and replaced if they aren’t within new tolerances. An ” overhauled ” engine has new parts installed when they are worn beyond limits, but many are left in place because the wear limit hasn’t been exceeded.

What does STOH mean in aviation?

STOH (Since Top Over Haul) Top overhaul is a term used by the general aviation industry when all the cylinders on the engine are overhauled or replaced with new, possibly due to corrosion.

What does total time airframe mean?

Airframe Time – TTAF ( total time airframe ) will come up quite a bit in your search for an airplane it is simply defined as the total time since that aircraft was built. This is commonly overlooked but is something to look at. That can usually mean one thing, that aircraft was used in a flight school.

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How long do aircraft engines last?

The high performing engines typically are specified to last 3000+ hours and the long lasting engines are often specified to last 30000 hours and usually last longer. The 30000 hour number is 3 1/2 years of continuous 24/7 operation.

What does Tbo mean?


Acronym Definition
TBO Time Between Overhaul
TBO Time between Order (inventory management)
TBO To Be Ordered
TBO Total Benefit of Ownership


What is the difference between overhaul and rebuilt in aviation?

In other words, a rebuilt engine starts anew with a clean sheet of paper. An overhauled engine continues the story of its life in the same logbook it was born with. Only the manufacturer, or a facility it approves, can rebuild an engine.

How much does an aircraft engine overhaul cost?

It is recommended that most piston aircraft engines be rebuilt every 1,800 to 2,000 or so hours. This TBO time is set by the engine manufacture. Overhaul costs can easily run around $18,000 so an aircraft with a run-out engine will cost quite a bit less than one with a newly rebuilt engine.

How many times can you overhaul an engine?

Engines – in theory they can be overhauled indefinitely. In fact, overhauls are only a recommendation for non commercial ops. Real world- after 2-3 overhauls may as well exchange for a 0 time already overhauled or rebuilt engine.

What does TTAF stand for?

TTAF stands for Total Time Air Frame (aircraft)

What is a top overhaul in aircraft?

Top overhaul consists of repair to parts outside of the crankcase, and can be accomplished without completely disassembling the entire engine.

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What is considered high airframe time?

For the airframe 10,000 hours is usually considered to be ” high time ” (often these have been “working airplanes” – flight school trainers, etc.) – This doesn’t mean the plane is worn out, but it bears special consideration in the inspection.

Are 30 year old planes safe?

Aircraft age is not a safety factor. However, if the aircraft is older and hasn’t been refurbished properly, it may cause flyers some inconvenience such as overheating, faulty air conditioning, or faulty plumbing in the lavatory.

Is Tbo mandatory?

The TBO is a time ‘recommended’ by the manufacturer and, depending upon what rules the aircraft operates under, overhauling the engine at this time is not necessarily mandatory. For aircraft in non-commercial use overhauls are not mandatory, but highly recommended.

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