AD 80-22-05

80-22-05 TELEDYNE CONTINENTAL MOTORS: Amendment 39-3948. Applies to engine models as follows: TSIO-520-M, serial numbers 511000 through 520187, 230126R through 230129R, 230131R through 230142R, and 230144R through 230146R, installed in, but not limited to, certain Cessna Models TU206G and T207A airplanes certificated in all categories; TSIO-520-P, serial numbers 513000 through 513620, and 236401R, installed in, but not limited to, certain Cessna Model P210N airplanes certificated in all categories; TSIO-520-R, serial numbers 512000 through 517961, 230226R, 230228R, 230230R through 230233R, 230235R through 230246R, and 230248R, installed in, but not limited to, certain Cessna Models T210M and T210N airplanes certificated in all categories. Compliance is required within the next 25 hours time in service after effective date of this AD, unless already accomplished. To prevent the crankshaft front oil seal being dislodged from the engine crankcase, accomplish the following: (a) Remove engine top cowl panel and left and right nose cowl sections. (b) Inspect the crankshaft front oil seal which is located on the crankshaft where it passes through the front engine case. If the seal is displaced or there is evidence of oil leakage, replace the oil seal in accordance with the appropriate maintenance manual. (c) Install two (2) seal half plates, TCM Part No. 641361, on the forward face of the crankcase with four (4) TCM Part No. 628321-.38 bolts. Torque bolts to 21-25 in-lbs. (d) Reinstall left and right nose cowl sections and engine top cowl panel, ensuring that baffle seals are fitted and turned in the correct direction. (e) Run the engine until normal operating temperature is reached and inspect crankshaft front oil seal for leaks. (f) Make an appropriate maintenance record entry. NOTE: Teledyne Continental Service Bulletin No. M80-20, dated September 12, 1980, pertains to this subject. An equivalent method of compliance may be approvedby the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region. This amendment is effective October 24, 1980.