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What is Mil-C-5541 Type 1A "PS 249"?

Can you tell me what the "PS249" suffix on this finishing spec might possibly refer to?

Kevin Gosselin
Fabricator - Guelph, ON Canada
June 15, 2010

PS 249 could be related to a Pratt & Whitney spec. for chemical milling.

Frank Dunleavy
Aerospace. - Dublin, Ireland
June 22, 2010

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