Service Letter No. 254 

April 15, 2013 

To all Owners and Operators of Lycoming Piston Aircraft Engines

Lycoming Engines’ naming convention for carburetor model designations is identified in the following  table. The naming convention is intended to prescribe the general feature set specification of the carburetor  and does not constitute the complete specification of the product.

Service Bulletin No. 201 F

March 26, 2013

MODELS AFFECTED

All Lycoming direct drive aircraft engines

TIME OF COMPLIANCE

Before continued operation of an engine that had sudden stoppage

This Service Bulletin applies to instructions for a bent crankshaft flange. Lycoming Engines no longer allows bent crankshaft flanges to be ground or repaired to restore maximum run-out. As per Service Bulletin 533B, if the crankshaft is bent, it must be replaced.

Service Bulletin No. 604 

DATE: November 21, 2012 

MODELS AFFECTED

New, rebuilt, or overhauled  Lycoming  TIO­540­AK1A  engine  models in Table 1 Lycoming engine models field­overhauled or repaired with model TAO411, P/N 410188­019 turbocharger turbine wheel.

TIME OF COMPLIANCE

Before further flight.

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