MECH RPT OF INSTALLATION OF WRONG PROPS ON 2 ACFT.

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AT OUR SHOP IN SLOBE; AZ; WE REPAIRED AN SMA X. AT THE SAME TIME WE HAD IN OUR SHOP AN SMA Y. THESE ACFT BOTH HAVE NON-TURBOCHARGED ENGS OF 300 HP. THE PROPS FOR BOTH OF THESE ACFT WERE SENT OUT TO BE OVERHAULED. WHEN THEY WERE RETURNED TO OUR SHOP THEY SOMEHOW WERE INSTALLED ON THE WRONG ACFT. THEY ARE SIMILAR 3 BLADED PROPS. THE PROP FOR THE SMA X IS AN XYZ AND THE PROP FOR THE SMA Y IS ZYX. THE SMA Y WAS SOLD TO A COMPANY IN INDONESIA AND SUBSEQUENTLY EXPORTED. THE SMA X WAS SOLD TO A DEALER IN KY. ABOUT JUL OF THIS YR; A MAN FROM A FLYING SVC CALLED AND SAID SMA X HAD AN INCORRECT PROP INSTALLED ON IT. HE SAID IT WAS DISCOVERED DURING AN ANNUAL INSPECTION. THIS ACFT AT THIS POINT MUST HAVE BEEN ANNUALED AT LEAST 4 TIMES SINCE IT LEFT OUR SHOP. HE SAID THAT HE COULDN'T LICENSE THE AIRPLANE AT THIS TIME BECAUSE THIS PROP WASN'T APPROVED FOR THIS SERIAL NUMBER AIRPLANE ON THE TYPE CERTIFICATE DATA SHEET FOR THIS ACFT. THE CORRECTIVE ACTION TAKEN IS THAT WE ARE SUPPLYING A CORRECT PROP TO THE OWNER OF SMA X.