Wing Repairs

[astjp2]

Here are a couple of pics from some wing repairs....4 broken ribs and a mangled leading and trailing edge. Tim

[dalijohn]

Re: Wing Repairs

Any one have a idea at what serial number they switched from the built-up ribs to the stamped ribs?

[astjp2]

Re: Wing Repairs

It happened during the war, the factory took older aircraft and converted them to BC-12D-85's after the war so you could have either. Tim

[flybikefarm]

Re: Wing Repairs

My t-craft was built Jan 2 of 46. They changed to stamped ribs in Feb. George Serial #6631

[dalijohn]

Re: Wing Repairs

George,

What's your serial number; mine is 7122 and has stamped ribs. I was told that this s/n should have built-up ribs, but don't find any documentation of the wings being replace. Also, one side is rib stitched and the other wing has the clips. Which is correct and legal?

[astjp2]

Re: Wing Repairs

Stitched and martin clips are both legal. Tim

[Ray36048]

Re: Wing Repairs

Fabric much be attached in same method as used by the manufacture. Any deviation of attachment methods is considered a major alteration. Major alterations can only be done by an STC or 337. This is per AC 43.

Rib stitch was used on built up rib pre war airplanes, post war with stamped ribs used martin wire.

I know there is an STC for post war wings to use PK screws. Is there also an STC for rib stitch?

[astjp2]

Re: Wing Repairs

Its just a field approval, There is a 337 listed in the tech section for marson/olys rivets....Tim