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Lycoming Piston Engines

AD/LYC/115	Lycoming Crankshaft Replacement	5/2006

Applicability:	Lycoming Engines AEIO-360, IO-360, O-360, LIO-360, and LO-360 series reciprocating engines, manufactured new or rebuilt, overhauled, or that had a crankshaft installed after 1 March 1999.
Requirement:	1. Check serial number of your engine and crankshaft. If Table 1 of SupplementNo. 1 to Lycoming Mandatory Service Bulletin (MSB) No. 566, dated30 November 2005, lists your engine serial number (SN), use Table 2 of Supplement No. 1 to verify if your crankshaft SN is listed.If Table 1 of Supplement No. 1 to MSB 566 does not list your engine SN, use Table 2 of Supplement No. 1 to verify if your crankshaft SN is listed, if an affected crankshaft was installed as a replacement.2. If Table 2 of Supplement No. 1 lists your crankshaft SN, replace the crankshaft with a crankshaft that is not listed in Table 2 of Supplement No. 1. to Lycoming MSB 566.Note 1: If Lycoming Engines manufactured new, rebuilt, overhauled, or replaced the crankshaft in your engine before 1 March 1999, and you haven't had the crankshaft replaced, no further action is required.Note 2: The engine and crankshaft SNs listed in Table 1 and Table 2 of Supplement No.1 to Lycoming MSB 566 are different from the engine and crankshaft SNs affected by Lycoming MSBs No. 552, No. 553 and No. 566; and CASA ADs AD/LYC/107 and AD/LYC/112.3. Do not install any crankshaft that has a SN listed in Table 2 of Supplement No. 1 to Lycoming MSB 566 into any engine.Note 3: FAA AD 2006-06-16 Amendment 39-14525 refers.
Compliance:	1. Unless previously accomplished, within 50 hours time-in-service or 6 months after the effective date of this AD, whichever is earlier.2. Unless previously accomplished, within 50 hours time-in-service or 6 months after the effective date of this AD, whichever is earlier.3. After the effective date of this AD.

Applicability:

Lycoming Engines AEIO-360, IO-360, O-360, LIO-360, and LO-360 series reciprocating engines, manufactured new or rebuilt, overhauled, or that had a crankshaft installed after 1 March 1999.

Requirement:

1. Check serial number of your engine and crankshaft. If Table 1 of SupplementNo. 1 to Lycoming Mandatory Service Bulletin (MSB) No. 566, dated30 November 2005, lists your engine serial number (SN), use Table 2 of Supplement No. 1 to verify if your crankshaft SN is listed.If Table 1 of Supplement No. 1 to MSB 566 does not list your engine SN, use Table 2 of Supplement No. 1 to verify if your crankshaft SN is listed, if an affected crankshaft was installed as a replacement.2. If Table 2 of Supplement No. 1 lists your crankshaft SN, replace the crankshaft with a crankshaft that is not listed in Table 2 of Supplement No. 1. to Lycoming MSB 566.Note 1: If Lycoming Engines manufactured new, rebuilt, overhauled, or replaced the crankshaft in your engine before 1 March 1999, and you haven't had the crankshaft replaced, no further action is required.Note 2: The engine and crankshaft SNs listed in Table 1 and Table 2 of Supplement No.1 to Lycoming MSB 566 are different from the engine and crankshaft SNs affected by Lycoming MSBs No. 552, No. 553 and No. 566; and CASA ADs AD/LYC/107 and AD/LYC/112.3. Do not install any crankshaft that has a SN listed in Table 2 of Supplement No. 1 to Lycoming MSB 566 into any engine.Note 3: FAA AD 2006-06-16 Amendment 39-14525 refers.

Compliance:

1. Unless previously accomplished, within 50 hours time-in-service or 6 months after the effective date of this AD, whichever is earlier.2. Unless previously accomplished, within 50 hours time-in-service or 6 months after the effective date of this AD, whichever is earlier.3. After the effective date of this AD.

	This Airworthiness Directive becomes effective on 11 May 2006.
Background:	This AD results from a crankshaft failure in a Lycoming LO-360-A1H6 reciprocating engine. CASA is issuing this AD to prevent failure of the crankshaft, which could result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

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