Service Bulletin No. 569 A

Crankshaft Retirement for Certain Lycoming Engines


Supersedes Service Bulletin No. 569

Aprl 11, 2006


Any Lycoming engine model specified below manufactures, rebuilt, overhauled, or repaired after March 1, 1997:

  • Lycoming counterweighted (L)IO-360, and AEIO-360 engines described in section 1.
  • Lycoming IO-390 and AEIO-590 engines described in Section 2.
  • Lycoming O-540, IO-540, AEIO-540 and (L)TIO-540 engines described in Section 3.
  • Lycoming IO-580 and AEIO-580 engines described in Section 4.
  • Lycoming IO-720 engines described in Section 5.
  • Lycoming crankshafts with a crankshaft serial number listed in Table 5 shipped as a spare after March 1, 1997. These cranksharts may have been installed in any of the models listed above. 

At the first crankcase separation or at the next overhaul, whichever occurs first, but not later than February 21, 209. Therefore affected crankshafts must be removed and retired by February 21, 2009. 

Lycoming has continued to analyze crankshafts in service. While there have been no failures in the crankshafts which are the subject of the Service Bulletin, as part of our commitment to quality, Lycoming is initiating a crankshaft retirement program. This crankshaft retirement programrequires the removal of the subject crankshafts when the crankcase is separated or at overhaul, whichever occurs first, but not later than February 21, 2009.

Supplement No. 1 to Service Bulletin No. 569A

For more information on Crankshaft Retirement, refer to Supplement No. 1 to Service Bulletin No. 569A.

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