79-15-02 AVCO LYCOMING: Amendment 39-3516. Applies to Avco Lycoming O-360-A1G6D engines with Serial Numbers prior to L-26456-36A except L-23465-36A, L-23783-36A, L-23865-36A, L-24278-36A, L-25075-36A, L-25129-36A, L-25131-36A, L-25998-36A, L-26069-36A through L-26071-36A, L-26073-36A through L-26076-36A, L-26123-36A through L-26128-36A, L-26130-36A, L-26131-36A, L-26139-36A, L-26205-36A through L-26207-36A, L-26236-36A through L-26242-36A, L-26278-36A, L-26281-36A through L-26283-36A, and to the Avco Lycoming LO-360-A1G6D engines with Serial Numbers prior to L-296-71A except L-102-71A, L-107-71A, L-109-71A, L-113-71A, L-158-71A, L-171-71A, L-237-71A, L-246-71A, L-250- 71A, L-255-71A, L-256-71A, L-259-71A through L-273-71A, L-275-71A through L-282-71A, L-284-71A through L-286-71A, L-289-71A.
Compliance required within the next 10 hours in service after the effective date of this AD, unless previously accomplished.
To prevent inflight power loss due to loosening of the internal economizer channel plug in the Model HA-6 carburetor, remove the P/N 80-150 plug and replace with P/N 80-364 plug in accordance with Avco Lycoming Service Bulletin No. 434 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.
Note. Marvel-Schebler/Tillotson Service Bulletin A1-79 and Beechcraft Service Instructions No. 1045 also pertains to this subject.
This amendment is effective July 20, 1979.