What was found
ADG DEPLOYED IN FLIGHT AT APPROX 280 KTS. ADG WAS DEPLOYED FOR 72 MINS. AC ESSENTIAL BUS WAS NEVER DE-POWERED. AIRCRAFT REMOVED FROM SERVICE. COMPLIED WITH SUP 16-172, TROUBLESHOT, PER FIM 24-23-00, NO FAULT FOUND. PERFORMED SPECIAL VISUAL INSPECTION OF ADG, IAW AMM 24-23-01 AND AWAC SUP 10-066A. NO DAMAGE FOUND, REF PAGE 319685/3 FOR MEL OF NDT PENETRANT INSPECTION OF ADG.