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Textron Lycoming Service Bulletin No. 549 "mandates" nondestructive testing of crankshafts installed in -360 series airplanes or shipped as spare parts. The SB states that a "potential metallurgical condition" may exist on 4-cylinder crankshafts shipped from the factory between May 1, 1997 and April 30, 2000.
Lycoming SB No. 549 lists 1160 affected crankshafts. Per the SB, warranty coverage for the SB's required inspection will be extended only through October 31, 2001. Inspections must be conducted by one of a number of Lycoming certified facilities listed in the SB.
AOPA recognizes that metallurgical deficiencies in crankshaft material can ultimately lead to catastrophic consequences. AOPA is concerned, however, over the availability of replacement parts, the adverse impact of aircraft downtime that will inevitably result from a parts shortage, and the ability for certified testing facilities to complete the inspections prior to Lycoming's October 31 warranty coverage deadline. AOPA has been in contact with Lycoming officials regarding these issues and will continue to press for reasonable resolution.
On March 23, 2001, Textron Lycoming published Service Bulletin No. 549.
Textron Lycoming Service Bulletin No. 549, March 23, 2001 (requires Adobe Reader)
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