Service Bulletin No. 634
Cylinder and Head Assembly Serviceable Life
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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