Readers ask: What Does Zero Timed Mean Aviation?

What does tt mean in aviation?

TT – This means the ‘total time’ on the engine since new or rebuilt. TTE– Total time engine or engine total time (ETT). TSMOH – Time or hours on the engine since last major overhaul.

What is the difference between overhauled 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.

How many times can an aircraft engine be overhauled?

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.

When should an aircraft engine be overhauled?

Times typically run between 1,500 and 2,500 hours and there’s usually a calendar factor of about 12 years so the guidance is for whatever comes first. Piston aircraft engines are extremely reliable when properly maintained, when flown regularly and correctly.

What is TTAF in aviation?

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.

How much time is too much on an airframe?

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.

Is engine rebuild worth it?

Since the car is 20 years old it may not be worth much more than $2,000 even with a rebuilt engine and it may be worth about $500 as scrap. In this case, a full engine rebuild is not only worth it but also could also increase the value of a car that does not suffer from other wear and tear problems.

Can you rebuild your own aircraft engine?

Only the manufacturer, or a facility it approves, can rebuild an engine. In most cases, an FAA-certificated airframe and powerplant ( A ) technician can legally overhaul your piston aircraft engine and return it to service, providing it doesn’t need any major repairs.

How much does an aircraft engine overhaul cost?

The cost of overhaul varies widely, but is at least $8,000 for a low budget field overhaul, up to $20,000 for a factory overhaul. Additional reserves are used for things like keeping the airplanes radios up to date, paint jobs and interior refurbishment.

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.

Why do aircraft engines burn oil?

Air-cooled aircraft engines burn oil, thanks to their necessarily loose piston, piston ring, and cylinder wall tolerances, so ash-forming detergent additives are an aviation no-no (and why you don’t run auto oil in airplane engines ).

What is major overhaul?

A major overhaul consists of the complete disassembly of an engine. The overhaul facility inspects the engine, repairs it as necessary, reassembles, tests, and approves it for return to service within the fits and limits specified by the manufacturer’s overhaul data.

Can you work on your own aircraft?

Federal aviation regulations (FAR) permit owners to perform and sign off on a number of preventive maintenance (PM) tasks on their own aircraft.

What are the two types of overhauling?

There are two types of overhaul: major or top overhaul.

Who can rebuild an aircraft engine?

Only the original manufacturer can rebuild an engine, and it comes to you with a zero time logbook and no operating history (because a rebuilt engine is done by the factory and is to new- engine limits and may be made up of components from a bunch of other engines there’s no way to give it a history, so it’s treated the