AD 80-02-13

80-02-13 AVCO LYCOMING: Amendment 39-3671. Applies to TO-360-C1A6D series engines serial numbers L-101-69A through L-264-69A except L-200-69A, L-246-69A and L-254-69A and all TO-360-C1A6D series engines overhauled (also known as remanufactured) by Lycoming prior to May 4, 1977. Compliance required within the next 50 hours in service after the effective date of this AD, unless already accomplished. To prevent possible loss of engine oil due to the failure of turbocharger oil drain flange P/N LW-14391, replace the turbocharger oil drain flange with oil drain flange P/N LW-16036 in accordance with AVCO Lycoming Service Bulletin No. 426 or FAA-approved equivalent. Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Eastern Region. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA Eastern Region may adjust the compliance time specified in this AD. This amendment is effective January 22, 1980.