Service Bulletin No. 591 A
Supersedes Service Bulletin No. 591
May 10, 2010
MODELS AFFECTED
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.
TIME OF COMPLIANCE
Within 10 hours of engine operation or at the next maintenance event, whichever occurs first.