The Cessna 120-140 Association Forum

Has anyone out there installed a pair of early Cessna 150 wings on a Cessna 140A. I have a project 140A that the wings that are scrap. I purchased a set of early 150 wings that will fit the 140A but I will have to modify the flap area to use 140A flaps. Things would be better if I could use the 150 wings with the larger flaps. What do you guys think? Earl Evans 53A

The rear spar in front of the flaps are taller than the same area on a 140. The difference is around half to 3/4 of an inch. If you put 140 flaps on a 150 wing they're not thick enough to catch the air flow. My two cents...

What data do you have to do this? STC? Field approval?
How will you document it?
Just curious.

Rick

VIP645 wrote: ↑Thu Apr 03, 2025 8:00 pm Has anyone out there installed a pair of early Cessna 150 wings on a Cessna 140A. I have a project 140A that the wings that are scrap. I purchased a set of early 150 wings that will fit the 140A but I will have to modify the flap area to use 140A flaps. Things would be better if I could use the 150 wings with the larger flaps. What do you guys think? Earl Evans 53A

You should call David Lowe. He can tell you if and how early 150 wings could be utilized, but keep in mind the job would require some extensive removal and addition of ribs and components to make the wings compatible. With that said, you can’t use early 150 wings with fowler flaps on a 140A, that would change the type certificate. Additionally, the 140A doesn’t have the elevator authority required for use of fowler flaps (due to the smaller elevator surface area compared to the larger 150 elevator surface area) to raise the nose adequately during landing. David mentioned to me that Cessna was considering installing larger flaps on the 140A which would have been possibly the 140B, but gave up on the idea. Marketing at the time (early 1950’s) in the company was pointing towards (4) seat aircraft hence the 170/170A/170B type airplanes rather than (2) two seat aircraft like the Cessna 140/140A series in order to boost sales.