Service Instruction No. 1047 B

Inspection and Reconditioning Procedures for Nitride Hardened Steel Cylinders

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Supersedes Service Instruction No. 1047A

DATE: November 24, 1967

MODELS AFFECTED

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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