Service Instruction No. 1498 A

Recommended Engine Procedures for Purge of Vapor During Ground Operations

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Supersedes Service Instruction No. 1498

April 13, 2011

MODELS AFFECTED

Lycoming IO-360-L2A engines installed in Cessna C172R and 172S aircraft used in training operations

TIME OF COMPLIANCE

As necessary during aircraft operations

The fuel system is more susceptible to vapor formation and its effects during operation in warm weather. This Service Instruction identifies vapor symptoms and corrective action necessary to remove vapor from the fuel system.

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