by Chris Kuyoth » Mon Jun 07, 2010 8:44 pm
Chic,
I have a friend with a 250 that has the same mod. He told me that the STC to add the 5th seat is no longer supported/available. I have a copy of the drawings.
The conversion appears to me to be a rather large tear-up. The rear bulkhead/empenage close-out is heavily modified, the 2nd row seat frames are unique and bolt to the spar-cap and the foot well in the floor is fabricated from fiberglass. There may also be re-routing of control cables required. You may be better off just looking for a B-model, especially now since the price gap between A & B models seems to be narrowing, (just a casual observation from Trade-a-Plane).
I converted my '65 "A" model 260 from a bench rear seat to individual "B" model rear seats on tracks. I obtained the 5th seat STC drawings from my friend in case I needed supporting evidence for the FAA that this type of mod is common place. Turns out that since I used all "B" model components and copied the "B" model design, I did not need anything else to convince the FSDO of the validity of the mod.
Chris