Having missing log (records) that are 10 or more years ago really
isn't a problem. Many of the records can be found such as
alterations and type of equipment currently installed. Having a good
annual inspecting will base line the aircraft. I explain this in a
book I wrote. If you can account for the AD's that is one problem
solved if not then they have to be re-accomplished and on the airframe
that shouldn't be to difficult. What most important is current
records say the past 5 to 10 years.

With a little research some of your airframe records can be found AC
43.9 covers this quite well. If you need assistance you can contact me
through my web site: http://stacheair.com. I can search the aircraft
history for accident or incidents this will fill in some of the missing
stuff.

Stache