how often do you have to replace a Cessna 172 engine if it is being leased out commercially?
October 12, 2008
i am have logged my 20th hour and am about to solo and i want to but a Cessna and lease it out at my flight school. I know it needs its 100 hour inspection but how often do you have to replace its engine i know there is a specific number. Please do not answer unless you are 100% sure!!! THANKS A LOT for the help
And how much do the Cessna 172 engines usually cost
The newer 172s are equipped with Lycoming engines and the recommended time between overhaul (TBO) is typically 2000 hrs. If the engine is flown regularly and flown and maintained per the manufacturer's directions you have a good chance of making it to the TBO of 2000 hours. You have several choices at that time. You can perform a field overhaul where a local mechanic replaces the cylinders and other worn components but chances are it will not last another 2000 hours. You can get a factory remanufactured engine where they take your old engine and add new parts as necessary to get the engine to factory new standards. Or you can buy a factory new engine. A field overhauled engine will cost $10,000 minimum, a factory reman will run probably $15,000 or more and a new engine will cost upwards of $20,000 or more. These numbers might seem high but one has to remove the engine, ship it, and install the new engine. Typically other accessories will need to be replaced as well. This might include a new propeller, new magnetos, a new alternator, a new oil cooler, a new starter, etc. I have personally done this about 4 times as the maintenance officer for a local flying club. I would recommend a factory reman or a factory new engine. Good luck.
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9 Responses to “how often do you have to replace a Cessna 172 engine if it is being leased out commercially?”
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The engine manufacturer has put a T.B.O. on the engine. Its probably either 1500 or 2000 hours.
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You don't buy a new engine (unless it has major problems). It would be torn down and rebuilt by a certified A&P mechanic . It sounds like you need to do some homework on how all this works. I suggest talking to your instructor and getting some input as to how to proceed.
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Well, you only need to replace when it is not WORKING anymore. The usage is all depends on how many miles/hours the aircraft has flown. Every 100 hours the local Flight Mechs. can inspect the aircraft. You must have it inspected by FAA Certified Mech. once ever year or you loose your aircraft registration.
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My best guess I would have to say, you replace a 172 engine about every 30 hours or so… LOL!!!!! How often do you replace your car's engine? Well that is the same as replacing a 172 or 152 or B717 or B747 or A318 or A320 or A380, or F16, and yes jet engines are much different from prop engines… What I am getting at is you do not replace an engine unless it has seen better days…
Captain, Chris W T
ATP- Lear 45, B747- A318 – A380
CFI
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The engines can sometimes be extended on their tbo times. You need a special variance for that though. Around 2000hrs is the tbo time. Not only is the engine inspected every 100 but the oil is changed every 50. the IO-360-L2A is a 2000 hr engine. What do you have?
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17 year A&P
The newer 172s are equipped with Lycoming engines and the recommended time between overhaul (TBO) is typically 2000 hrs. If the engine is flown regularly and flown and maintained per the manufacturer's directions you have a good chance of making it to the TBO of 2000 hours. You have several choices at that time. You can perform a field overhaul where a local mechanic replaces the cylinders and other worn components but chances are it will not last another 2000 hours. You can get a factory remanufactured engine where they take your old engine and add new parts as necessary to get the engine to factory new standards. Or you can buy a factory new engine. A field overhauled engine will cost $10,000 minimum, a factory reman will run probably $15,000 or more and a new engine will cost upwards of $20,000 or more. These numbers might seem high but one has to remove the engine, ship it, and install the new engine. Typically other accessories will need to be replaced as well. This might include a new propeller, new magnetos, a new alternator, a new oil cooler, a new starter, etc. I have personally done this about 4 times as the maintenance officer for a local flying club. I would recommend a factory reman or a factory new engine. Good luck.
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In addition to the 50-hour oil changes and 100 hour inspections, the aircraft still needs an annual inspection, which can take the aircraft out of service for several weeks, depending on the mechanic's workload and parts needed. An annual on a 172 will typically cost around $1,000.
Depending on the model and year, a 172 engine has a TBO of 1600 to 2400 hours. At this point you have several options… You can have a local mechanic rebuild the engine, you can send it out to a professional rebuild shop for an overhaul, or you can replace the engine with another one that is factory overhauled or even factory new. This is also a good time to rebuild or replace the prop and accessories that have limited lifetimes, such as the vacuum pumps, alternators, magnetos, etc.
This is the purpose for keeping a maintenance reserve fund for your airplane. Depending on the type of service and other parts and accessories that you have replaced, an engine overhaul at TBO can run from $10,000 to $25,000.
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From what I understand no matter what the plane is being used for if it being flown in the US the engine has to be rebuilt at 2000 hours or sooner. I think the mechanic takes an oil sample at every oil change and they find excessive metal in the oil they would rebuild the engine sooner. That helps keep you from having an unexpected engine failure.
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Check out the TBO for the engine your aircraft is equipped with. On rental aircraft, the engine must be overhauled at TBO and has to be replaced when it is no longer repairable.
There may be a point where it is still repairable, but the cost of parts exceeds the cost of a rebuilt engine.
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