United States Government Publishing Office publisher pbl distributor dst United States National Archives and Records Administration Office of the Federal Register author aut Government Organization text government publication eng FR Regulatory Information 1995_register executive 2010-09-25 article Proposed Rules D09002ee1be05a3de D09002ee1be05a474 United States Department of Transportation originator org United States Government Agency or Subagency United States Federal Aviation Administration originator org United States Government Agency or Subagency This notice revises a proposal to issue an airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-360, TSIO-360, LTSIO-360, IO-520, and TSIO-520 series engines. Airworthiness directive 87-23-08 currently requires ultrasonic inspections for sub-surface fatigue cracks in crankshafts installed in TCM IO-520 and TSIO-520 series engines, and replacement of the crankshaft if a crack is found. The proposed AD would have superseded AD 87-23-08 by expanding the applicability of the AD to include IO-360, TSIO-360, LTSIO-360, and LTSIO-520 series engines, requiring the removal of all crankshafts manufactured using the airmelt process on all of the affected engine models, and replacement with crankshafts manufactured using the vacuum arc remelt (VAR) process. The proposed AD would have eliminated the ultrasonic inspections for the TCM IO-520 and TSIO-520 series engines. That proposed rule was prompted by reports of crankshaft failures due to sub-surface fatigue cracking on engines that had been inspected in accordance with the current AD. This action revises the proposed rule by superseding AD 87-23-08 and incorporating the ultrasonic inspection requirements in the proposed AD. The proposed action would still require removal of crankshafts manufactured using the airmelt process and replacement with crankshafts manufactured using the VAR process. The actions specified by this proposed AD are intended to prevent crankshaft failure and subsequent engine failure. 60 FR 43995 https://www.govinfo.gov/app/details/FR-1995-08-24/95-20991 95-20991 fr24au95-25 4910-13-U Docket No. 93-ANE-08 https://www.govinfo.gov/app/details/FR-1995-08-24/95-20991 https://www.govinfo.gov/content/pkg/FR-1995-08-24/html/95-20991.htm https://www.govinfo.gov/content/pkg/FR-1995-08-24/pdf/95-20991.pdf 3 p. 43995 43997 60 FR 43995 Title 14 Part 39 14 CFR Part 39 Airworthiness Directives; Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, IO-520, and TSIO-520 Series Reciprocating Engines; Federal Register Vol. 60, Issue PRORULE 95-20991 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 1995-10-23 Docket No. 93-ANE-08 4910-13-U 95-20991 Supplemental notice of proposed rulemaking; reopening of comment period.

This notice revises a proposal to issue an airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-360, TSIO-360, LTSIO-360, IO-520, and TSIO-520 series engines. Airworthiness directive 87-23-08 currently requires ultrasonic inspections for sub-surface fatigue cracks in crankshafts installed in TCM IO-520 and TSIO-520 series engines, and replacement of the crankshaft if a crack is found. The proposed AD would have superseded AD 87-23-08 by expanding the applicability of the AD to include IO-360, TSIO-360, LTSIO-360, and LTSIO-520 series engines, requiring the removal of all crankshafts manufactured using the airmelt process on all of the affected engine models, and replacement with crankshafts manufactured using the vacuum arc remelt (VAR) process. The proposed AD would have eliminated the ultrasonic inspections for the TCM IO-520 and TSIO-520 series engines. That proposed rule was prompted by reports of crankshaft failures due to sub-surface fatigue cracking on engines that had been inspected in accordance with the current AD. This action revises the proposed rule by superseding AD 87-23-08 and incorporating the ultrasonic inspection requirements in the proposed AD. The proposed action would still require removal of crankshafts manufactured using the airmelt process and replacement with crankshafts manufactured using the VAR process. The actions specified by this proposed AD are intended to prevent crankshaft failure and subsequent engine failure.

Comments must be received by October 23, 1995. Jerry Robinette, Aerospace Engineer, Atlanta Aircraft Certification Office, FAA, Small Airplane Directorate, Campus Building, 1701 Columbia Ave., Suite 2-160, College Park, GA 30337-2748; telephone (404) 305-7371, fax (404) 305-7348. Vol. 60, no. 164 Office of the Federal Register, National Archives and Records Administration 1995-08-24 continuing daily deposited born digital 310 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-1995-08-24 P0b002ee180a8bc99 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr24au95 https://www.govinfo.gov/app/details/FR-1995-08-24 https://www.govinfo.gov/content/pkg/FR-1995-08-24/pdf/FR-1995-08-24.pdf fdlp 43953 44252 DGPO 2010-09-25 2023-05-07 FR-1995-08-24 machine generated eng FR FR-1995-08-24 60 164