REFLECTOR: Threaded hole strength - seat belt

[Al Gietzen]

Okay, I'll bite. Now where are you using this plate and bolt in the 

airplane, because neither fine or coarse thread is going to be very strong 

going into only 1/4" aluminum?

 

Chuck H

 

One important place in our airplanes where we have small bolt (I think it is
5/16) threaded into ¼” aluminum, is the seatbelt anchors. The highest
loading would be on the ones on the keel side (standard 3-point restraint).
I have doubts that this anchor would handle the roughly 12-15 g loading that
I think a restraint system should handle (I don’t remember now where I got
that number).  The threads may not be the weak point; it may be the glass
plys holding the hardpoint.

 

I had discussed this with Mark Machado at Velocity some years back, and he
said they would do a test; but I guess that idea left when he did.

 

Al

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