Supersedes Service Instruction No. 1047A
DATE: November 24, 1967
All Avco Lycoming engines with nitride hardened steel cylinder barrels.
TIME OF COMPLIANCE
During overhaul of the engine.
Many Avco Lycoming engines are presently manufactured with cylinder assemblies that incorporate nitride hardened steel cylinder barrels. Because this cylinder barrel surface is hardened, the repair procedures are different from those for plain steel or chrome plated steel cylinders. Worn nitride hardened cylinder may be returned to Avco Lycoming to be re- built with new barrels.
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