What was found
ELEVATOR TAIL FLUTTER AT 300KTS AND ABOVE. BETWEEN 10,000 AND 20,000 ALSO IN DESCENT SLOWING THROUGH 250 KTS. REPLACED UPPER AND LOWER RUDDER 1 ATTACHMENT HINGES, RT STABILIZER TIP. COMPLETED ALL PARTS OF EO. ADJUSTED RUDDER DEFLECTION ECCENTRIC PIN TO ZERO POSITION ALONG WITH VIBRATION WORK CARD. 1(FITTING, PN 120-38377-001), 2(STABILIZER TIP, PN 145-35900), 3(SPACER, PN 145-25626-001), 4(BUSHING, PN 120-33582-005), 5(BUSHING, PN 120-33582-005). AC RETURNED TO SERVICE. (K)