The International Cessna^® 170 Association

I am looking at a number of 170s out there with the vertical fin that has the dorsal fin like the A and B models. What serial number did the 170 start the fin with the dorsil? Is there an STC to use the later fin on an airframe with the straight vertical fin?

Thanks, Sean Ellis
Eagle River, AK

The 48 didn't ever have it from the factory. But all 170s are eligible per the TCDS to have the dorsal installed.

Ah, I should have checked the TCDS. Thanks for the reply I really appreciate your answer.