What was found
DURING ACCOMPLISHMENT OF SERVICE BULLETIN, R/H HORIZONTAL STABILIZER UPPER SKIN HAS OVER COUNTERSUNK BLIND FASTENER HOLES (C-CHECK RO 5/21/2023) DRILLED, COUNTERSUNK AND REPLACED THE EFFECTED FASTENERS WITH THE NEXT LARGER SIZE (3/16"), REF ETD2023-170-012223. REPAIR DOES NOT MAKE ANY CHANGES TO THE WEIGHT AND BALANCE OF AIRCRAFT.ADDITIONAL INSPECTION REQUIREMENTS:INTERMEDIATE ACTION: DO A EXTERNAL DET INSPECTION AS PER NDT INTRODUCTION, TO MAKE SURE NO ADDITIONAL DAMAGE EXISTS, EVERY 250 FC. VALIDITY: THIS REPAIR IS CONSIDERED TEMPORARY AS IT WILL REQUIRE A DETAILED STRUCTURAL ANALYSIS. THE VALIDITY OF THIS REPAIR IS 12 MONTHS AS OF MAY 16, 2023 OR TILL THE SUBSTANTIATION IS CONCLUDED, WHICHEVER OCCURS FIRST. THIS ANALYSIS WILL INVOLVE COSTS THAT WILL BE NEGOTIATED WITH THE CUSTOMER. REPAIR INSPECTION: NO ADDITIONAL INSPECTIONS REQUIRED DURING THE 12 MONTHS VALIDITY OF TEMPORARY REPAIR.