Service Bulletin No. 591 A

Reprint of Kelly Mandatory Service Bulletin No. 039A, Turbine Wheel Replacement


Supersedes Service Bulletin No. 591

May 10, 2010


All Lycoming engines equipped with a rebuilt Kelly Aerospace Energy Systems turbocharger manufactured between January 2007 and June 2009 as per the part effectivity in Table I and per the serial number effectivity in Table III found in the attached reprint.


Within 10 hours of engine operation or at the next maintenance event, whichever occurs first.

This reprint is current at the time Lycoming Service Bulletin No. 591A is issued. However, when complying with this Service Bulletin, insure that compliance is in accordance with the latest revision of Kelly Aerospace Energy Systems, LLC Service Bulletin No. 039.

Get It Exchanged

Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.