The engines have to be replaced after a certain number of hours as determined by the manufacturer, or sooner if the certified mechanic says it has an issue. It can be rebuilt, but that takes months, and we always had a rebuilt by the manufacturer engine on the shelf waiting for the old one to time out, or have an issue.
We did careful maintenance and never ran the engine hard. The 206 was a 1967 model that was only 17 grand brand new. It has over 14,000 hours on the airframe. It was just a work truck to us, and it was not pretty, very faded paint and interior. But mechanically 100% sound. It was owned by the company where I worked.
That company closed and my business partner and I started from scratch and can do better work in less time with more profit with digital.
http://www.aerialviewpoint.com/mapping_cameras.htmo
This is a web site that some other aerial company has. We have nothing to do with them, they just have a good description of the RC-30. NASA still uses them. We went to a digital sensor years ago. Far cheaper, and lots easier and faster to get imagery to the client.
We have a Cessna 2004 182T now with the Garman 1000 panel.
This is our current airplane.
That was all done with vertical photography, and we make 3D model that can be rotated, or looked at from any angle. We do regular vertical photography of course as the main part of our business.