Service Instruction No. 1148 C

Use of Carburetor Heat Control

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Supersedes Service Instruction No. 1148C

October 12, 2007


All Lycoming engines using float type carburetors.


During engine operation.

Under certain moist atmospheric conditions (generally at a relative humidity of 50% or greater) and at temperatures of 20° to 90°F it is possible for ice to form in the induction system.

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