Service Bulletin No. 634

Cylinder and Head Assembly Serviceable Life

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Cylinder and Head Assembly Serviceable Life
DATE:

October 11, 2018

SUBJECT:

Cylinder and Head Assembly Serviceable Life

MODELS AFFECTED:

All Lycoming Engines with Parallel Valve Cylinder and Head Assemblies (Table 1) shipped from Lycoming Engines between 1-SEP-2013 and 30-APR-2015 (excludes O-235 series)

TIME OF COMPLIANCE:

During Cylinder and Head Assembly removal for condition or overhaul

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