TM 1-1520-238-23 Change 3 1-405 1.138. OVERHAUL AND RETIREMENT SCHEDULE – continued Part Name Part Number Overhaul Interval Hours Overhaul Interval Notes Retirement Interval Hours Retirement Interval Notes Main Rotor Head Assembly 7-311411003-601 1,750 7-311411003-605 1,750 7-311411003-607 1,750 7-311411003-609 1,750 7-311411003-611 1,750 7-311411003-613 1,750 7-311411003-615 1,750 7-311411003-617 1,750 7-311411003-619 1,750 * Bearing, Lower 7-114110011 91,400 * Bearing, Upper 7-211411202 1,750 7-311411202 1,750 7-311411202-5 1,750 7-311411202-7 1,750 * Plate, Upper 7-311411096 10,800 7-311411096-3 10,800 * Plate, Lower 7-311411080 10,800 7-311411080-7 10,800 * Lower Shoe Assembly 7-311411088 13,000 7-311411088-7 13,000 7-311411088-9 13,000 * Hub Subassembly 7-311411015 13,000 7-311411015-3 13,000 7-311411015-5 13,000 7-311411015-7 13,000 * Lead Lag Damper 7-311411110 8,700 7-311411110-3 8,700 7-311411110-5 8,700 7-311411110-7 8,700 * Rod End, Damper 7-211411186-5 7,100 * Trunnion Damper 7-311411187 6,500 * Trunnion Attachment Bolts NAS1312-33 7,100 2 NAS1312-38H 7,100 NAS1312-66 7,100 NAS6612-33 7,100 NAS6612-38H 7,100 NAS6612-66 7,100 GO TO NEXT PAGE