Service Bulletin No. 594

DATE: January 10, 2011

MODELS AFFECTED

All Lycoming new, overhauled, or rebuilt turbocharged or turbo normalized engines, shown in Table 1, shipped before October 27, 2010 with HET or Kelly turbocharger installed and has less than 50 hours of service time (Refer to the attached Table 2 of HET Mandatory Service Bulletin 040 A) HET or Kelly turbocharger shipped as a spare part from Lycoming Engines before October 27, 2010 (Refer to the attached Table 1 and 1b of HET Mandatory Service Bulletin 040 A.)

TIME OF COMPLIANCE

Turbochargers with 0 to 10 hours of time in service, before further flight; for turbochargers with 10 to 50 hours of time in service, do this check within the next 10 hours of time in service.

Lycoming Service Bulletin No. 594 applies only to Lycoming engines with Hartzell Engine Technologies LLC (HET) or Kelly turbochargers with Lycoming part numbers identified in Table 1 below and Table 1b of the attached HET Service Bulletin 040 A. The part numbers are on the data tag of the turbocharger.