83-08-01 R1 TRW HARTZELL PROPELLER: Amendment 39-4633. Letter issued April 29, 1983. Applies to all the TRW Hartzell Model HC-B3TN-2, HC-B3TN-3, HC-B3TN-5, HC- B4TN-3, HC-B4TN-5, HC-B4MN-5, and HC-B5MP-3 turbopropellers. The HC-B( )TN-2, HC- B( )TN-3, and HC-B( )MP-3 propellers are installed on Pratt & Whitney Aircraft of Canada Model PT6A-( ) series engines. The HC-B( )TN-5 and HC-B( )MN-5 series propellers are installed on the AiResearch TPE-331-( ) series engines.\n \n\tCompliance required as indicated, unless already accomplished. To preclude propeller attach bolt failures or improperly secured propellers, accomplish the following:\n\n\tA.\tPrior to further flight, all new propeller installations and serviceable propellers which are being reinstalled must be installed as follows: \n\n\t\t(1)\tInstall the propeller oil seal to the engine flange after ensuring that the engine and propeller flanges are clean.\n \n\t\t(2)\tCarefully install propeller on the engine flange ensuring that complete and true contact is established.\n\n\t\t(3)\tApply MIL-T-5544 Petrolated Graphite or TRW Hartzell Lubricant P/N A3338 to bolt threads and bolt washer surfaces (and remainder of bolt if desired).\n \n\t\t(4)\tInstall eight new B-3339 bolts and eight new A-2048-2 washers through engine flange into propeller flange.\n \n\t\t(5)\tTorque all bolts, with a torque wrench and an appropriate adapter, to 40 ft.-lbs. and then to 80 ft.-lbs. following torque sequence "A" (shown to below). Final torque all bolts using "B" sequence (shown below) to 100 to 105 ft.-lbs. Safety all bolts in an FAA approved manner.\n\n\n\n\n \n\tNOTE: TRW Hartzell Instructions No. 140 dated March 15, 1982, also pertains to this subject.\n \n\tB.\tWithin the next 300 hours time in service after the effective date of this AD, accomplish the following on all applicable turbopropeller installations presently using P/N A- 2047 propeller attach bolts: \n\n\t\t(1)\tCheck the torque, with a torque wrench and an appropriate adapter,of all eight propeller attach bolts (with washers installed). Torque should be 100 to 125 ft.-lbs. with dry threads. (Caution: Do not use any lubricant with the A-2047 bolts. Safety all bolts in an FAA approved manner.)\n \n\t\t(2)\tIf the torque of any 1 of the bolts is found to be less than 100 ft.-lbs., remove all 8 bolts and washers and replace with new (B-3339) bolts and new (A-2048-2) washers in accordance with paragraphs A (1) through (5) herein. (Caution: Do not use an intermix of A-2047 and B-3339 bolts in the same installation.) NOTE: The A-2047 bolt has the letter "H" stamped inside a triangle on the bolt. The B-3339 bolt has the part number stamped inside the cupped head.\n \n\tC.\tUpon request of the operator, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Chicago Aircraft Certification Office, FAA, 2300 East Devon Avenue, Des Plaines, Illinois 60018.\n \n\tThis amendment supersedes Amendment 39-3290 (43 FR 42731), AD78-18-01.\n \n\tAmendment 39-4633 became effective April 28, 1983.\n\n\tThis amendment becomes effective upon receipt.