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Old Sheet Metal Cross Reference
I知 repairing a flap on my 1959 PA-22/20 and I'm trying to identify the kind of aluminum piper used. I know the industry changed the way they identified sheet aluminum alloys from a 2 digit identifier to a 4 digit identifier somewhere along the way. I知 looking for a cross reference of some kind that would help me translate the old identification to the newer alloy identification.
The only markings I can make out on the original part are;
3S
H14 (hardness)
24S-1
.02 (thickness)
Daryl
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