What was found
ER/A 635924-14; A220-300/ FUSELAGE / AFT CARGO DOOR CUTOUT / FR 63 TO FR 66/ LOWER SILL / CORROSION. SUBJECT REPAIR REQUIRES FOLLOW-ON ACTION. ACCOMPLISH 635924-14, SECTION II REPETITIVE INSPECTION WITHIN 58,500 TOTAL AIRCRAFT FLIGHT HOURS OR 30,000 TOTAL FLIGHT CYCLES FROM TIME OF MANUFACTURE, WHICHEVER OCCURS FIRST. REPEAT THEREAFTER, WITHIN EVERY 43,875 FLIGHT HOURS OR 22,500 FLIGHT CYCLES, WHICHEVER OCCURS FIRST. ASSOCIATED ER/A 00-635924 ADDED FOR AC 8308. (LP# 1723659; AIRCRAFT WAS GROUNDED)