Re: Engine Pad question
A designates that was an earlier issued number,but now a later reused number within the same model year.
Flint began their 1971 serial sequence service engine numbering w/20000,and ended with 49999.In your case,once they hit 49999 and found a few more were necessary,they reused #24471,this time with the letter A to denote that & indicate a late production engine as well.
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