AD 82-09-01

82-09-01 TELEDYNE CONTINENTAL MOTORS: Amendment 39-4412. Applies to the following engines installed in, but not limited to, Cessna Models 340 and 414 series airplanes: NEW ENGINES: TSIO-520-NB serial numbers 519735 thru 519738, 519781 thru 519785, 519885 thru 519890, 519893 thru 519897, 519899 through 519915, 519929 thru 519933, 519935 thru 519937, 519939 thru 519962, 521026 thru 521045, 521049 thru 521074, 521085 thru 521088, 521097, 521141 thru 521168, 521170 thru 521183, 521187 thru 521237, 521239 thru 521247, 521249 thru 521255, 521257, 521258, 521260 thru 521281, 521284 thru 521305, 521307 thru 521335, 521339, 521340, 521342 thru 521345, 521347, 521349, 521351, 521353, 521354, 521357, 521358, 521362, 521365, 521366, 521371, 521378, 521384, 521385, 521393, 521395, 521398, 521413 thru 521418, 521441, 521442, 521455, 521461. REBUILT ENGINES: TSIO-520-J serial numbers 218830, 218831, 218836, 218838 thru 218873; TSIO- 520-K serial numbers 224563, 224565 thru 224573; TSIO-520-N serial numbers 228231, 228243, 228248 thru 228250, 228255, 228262 thru 228363, 228365 thru 228368, 228373; TSIO-520-NB serial numbers 233976, 233982, 233986, 233987, 233989 thru 234058, 234060 thru 234069, 234071 thru 234074, 234077, 234078. Compliance is required as indicated unless already accomplished. To prevent the possibility of a fuel leak which could result in an engine compartment fire, accomplish the following: A. Prior to next flight, activate the boost pump to static check the fuel pressure regulator inlet and outlet for leaks. Visually inspect in the area of the fuel pressure regulator for the presence of fuel stains. If either inspection indicates a leak or stains, comply with Paragraph B before further flight. If no leak or stain is evident, comply with Paragraph B within the next 10 hours of operation. B. Remove the fuel fittings from the regulator and inspect the thread bores in the regulator and the threads of the fittings. If the threads in the regulator appear damaged, cut, or chipped (when compared to a normal pipe thread), replace the fuel pressure regulator with a serviceable regulator of a like part number. Replace any damaged fittings. Prior to installing the fittings, clean the threads with clean degreaser, Loctite "LOQUIC PRIMER T" or equivalent, to be sure all oil and dirt is removed. Blow dry with dry compressed air. Apply Loctite Hydraulic Sealant 69 or 569 or equivalent sparingly 3/4 of the way around on the fitting threads only. To avoid contamination of the fuel cavity, do not apply sealant to the first thread. Install the fittings until tight (at least 3-5 threads engagement). Allow sealant to cure for 30 minutes before pressure testing. NOTE: Teledyne Continental Motors Service Bulletin No. M82-5, dated April 26, 1982, pertains to this subject. An equivalent method of compliance may be approved by the Chief, Atlanta Aircraft Certification Office, Federal Aviation Administration, ACE-115A, P.O. Box 20636, Atlanta, Georgia 30320. This amendment becomes effective July 8, 1982, as to all persons except those to whom it was made immediately effective by priority mail, issued April 16, 1982.