Service Bulletin No. 549

Engine/Crankshaft Inspection

  • Publications

DATE: March 23, 2001


See Attachment I for affected engine/crankshaft serial numbers.


Within the next 100 hours of operation but not to exceed 180 days from the date of this Service Bulletin.

Textron Lycoming has identified a potential metallurgical condition on a number of 4-cylinder crankshafts that shipped from the factory May 1, 1997 through April 30, 2000, either installed in –360 series engines or as spare parts. Engines and crankshafts on the attached lists are from the suspect lots. Textron Lycoming requires that these affected engines/crankshafts be inspected.

Product Support Network

Wherever you are in the world, you have access to exceptional expertise and knowledge about Lycoming engines. Get the most comprehensive customer service and support in the general aviation industry.

Related Publication

Supplement No. 1 to Service Bulletin No. 549

To learn more about Engine and Crankshaft Inspection, refer to the related Service Bulletin.

Lycoming's Loyalty Program

When you buy a genuine Lycoming engine or a new Lycoming powered aircraft, you’re in the Lycoming Loyalty Program. It’s that simple.