What was found
RH VERT AFT SPAR IS HEAVILY CORRODED. LOCATED ABOVE RUDDER UPPER HINGE. REPAIRED 2 BLENDED AREAS OF VERTICAL STABILIZER R/H AFT SPAR CAP AT APPROXIMATELY VFS 172 AND VFS 237 DUE TO CORROSION PER AQRD ERO-108612 REV. IR, TITLED,"RFTS-108612 - N370QS - VERTICAL STABILIZER AFT SPAR REPAIR" DATED NOV 3, 2023. SUPPORTED BY FAA FORM 8110-3 DATED 11/03/2023. THE FATIGUE AND DAMAGE TOLERANCE (F&DT) EVALUATION REQUIRED PER 14 CFR PART 25, SECTION 25.571 IS NOT INCLUDED AS PART OF THIS ENGINEERING DOCUMENT. PER NETJETS AVIATION, INC. GENERAL MAINTENANCE MANUAL 11.2.5 - THE F&DT EVALUATION MUST BE COMPLETED WITHIN 12 MONTHS FROM THE DATE OF ISSUE OF THE ASSOCIATED 8110-3. (ALTERNATE TERMINATING ACTIONS TO THE F&DT EVALUATION REQUIREMENT MUST BE SEPARATELY APPROVED AND ARE NOT INCLUDED IN THIS ERO.) REPAIR RECORDED ON FORM 337 DATED 13 NOV 2023.