Recommended TBO's

jkvincent · Post by **jkvincent** » Tue Jul 25, 2006 17:46

...could someone tell me the recommended TBO for the C-65, C-85 & C-90 ? thanks in advance, Jim

Paul Agaliotis · Post by **Paul Agaliotis** » Tue Jul 25, 2006 18:42

The TBO is 1800hrs or 12 years. This can be found in SIL98-9A.
Paul

Ron Babos · Post by **Ron Babos** » Tue Jul 25, 2006 19:54

Paul: Do you have an(on condition) in the states? For example an o320 has a tbo of 2000 hours, but if oil pressure is good with no metal in the filter and all compressions are in spec, I believe legally you can go up to 20% more. Something like that anyway. I was also told that recommeded tbo is rated at 50%, at least on the 0-320. That's the bottom end of course as no cylinder will go that long. Our club 172 has had all four cyls change at one time or other prior to 2000 hours.
Ron

Paul Agaliotis · Post by **Paul Agaliotis** » Tue Jul 25, 2006 20:47

Ron,
If the engine is used in a FAR Part 91 operation than the TBO is only a recommendation. If it is used in Part 121 or Part 135 operation (for hire) the TBO must be followed.
Paul

Post by **joea** » Tue Jul 25, 2006 23:31

Paul,

You bring up a good point. Continental wants us to overhaul the engine at 12 years, no matter what condition its in. Personally since mine is used for part 91 flying I am going to fly it until the engine needs some care.

We all know that this 12 year requirement is written by lawyers and has nothing to do with airworthyness...

Paul Agaliotis · Post by **Paul Agaliotis** » Wed Jul 26, 2006 00:00

Joe,
The Service Letter talks about environmental wear, what ever that is. I think if the rubber goes bad change the rubber.
Most of the planes fly about 50hrs a year. So every 600hrs (12yrs) they suggest an overhaul. Pretty good marketing.
Paul

Lowell Sterchi · Post by **Lowell Sterchi** » Wed Jul 26, 2006 12:01

I was in a flying club back in the late 60's, flying 150's (3) and a 172 with
the 0-320-E2D Engine. The 150's were flying 70 to 110hrs per Month and the 172 approx 90 to 120 per Mo. In the 14 years I was involved the rod
bearings on the 0-200 were gone at 2200 to 2300hrs. Some mechanics pulled and replaced the rod bearings at a top OH. Main bearings were still good. The 0-320 we pulled for OH at 3200 to 3600 hrs, it had a full flow oil
filter, and was still good inside. We did Overhaul the engines back to NEW
SPECTS to get these times. The banner towing Cubs with the same engine
were getting 4000 hrs on the lower end. This was the days of 80 oct. fuel.
We used Aero Shell W100, with oil change on the 0-200 at 50hrs and 100hrs on the 0-320 along with a new filter. We used an engine oil analysis to set oil changes and keep check on eng. cond. What this boiles down to, is, the more you fly, the cheeper it is. As you can see from the above info, the 172 was cheeper to fly than the 150's, just in engine times.

Jody Wittmeyer · Post by **Jody Wittmeyer** » Thu Jul 27, 2006 22:22

Let's see....12 years gives me about 2400 hours. We'll see what happens.

mike newall · Post by **mike newall** » Sat Jul 29, 2006 18:44

If it starts - go fly...... easy

Post by **joea** » Sat Jul 29, 2006 18:51

Mike,

This is our heartburn. Good engines, excellent compression and not making metal as well as fewer hours than the TBO and now Continental is saying that they need to be overhauled!!??

Glad that I am not a commercial operator who has to follow the service bulletins and am going to fly mine until it reaches TBO or has a problem inside!

Joe A

National Aeronca Association Bulletin Board

Recommended TBO's

Recommended TBO's

tbo

ENGINE TBO's