60-03-04: Propeller Blades

60-03-04\tHAMILTON STANDARD: Amdt. 91 Part 507 Federal Register January 26, 1960. Applies to 6895-8 Aluminum Alloy Propeller Blades Installed On Douglas DC-6, DC-6A, and DC-6B Aircraft. \n\n\tCompliance required as indicated.\n \n\tIn order to minimize the possibility of additional 6895-8 blade failures occurring between overhaul on DC-6, DC-6A, or DC-6B aircraft due to undetected blade damage, the face alignment check required by AD 58-22-01 must be supplemented as specified: \n\n\t(a)\tBlades which have not been checked for face alignment must be checked at overhaul as required by AD 58-22-01 or by April 15, 1960, whichever comes first, and thereafter at intervals not to exceed 1,000 flight hours.\n \n\t(b)\tBlades which have been checked for face alignment at overhaul as required by AD 58-22-01 and which by April 15, 1960, will have been in operation in excess of 1,000 flight hours since the last face alignment check was made must have a new face alignment check made not later than April 15, 1960, and thereafter at intervals not to exceed 1,000 flight hours. \n\n\t(c)\tBlades which have been checked for face alignment at overhaul as required by AD 58-22-01 and which by April 15, 1960, will have been in operation less than 1,000 flight hours since the last face alignment check was made must have new face alignment checks made at intervals not to exceed 1,000 flight hours. \n\n\tBlades which are checked and found not to meet the limits specified in Hamilton Standard Service Bulletins Nos. 546, 546A, and 602 shall be removed from service and treated according to Service Bulletin 596. Face alignment checks between overhauls may be made with blade alignment gages as specified in Service Bulletin 602. (Hamilton Standard Service Bulletins Nos. 546, 546A, 596, and 602 cover this same subject.)\n \n\tThis supplements AD 58-22-01 for Model 6895-8 blades installed on Douglas DC-6, DC-6A, and DC-6B aircraft only. \n\n\tRevised April 9, 1960, to all persons not receiving individual notice by telegram dated March 4, 1960.