AD 78-23-10

78-23-10 AVCO LYCOMING: Amendment 39-3333. Applies to all fuel injected Lycoming series engines equipped with the following Bendix Fuel Injector Models and Parts List Numbers.

Model Number Parts List Number RSA-5AB1 2524254-5 2524712-2 RSA-5AD1 2524054-5 2524147-7 2524213-5 2524291-5 2524359-4 2524450-3 2524550-2 2524673-2 2524682-2 2524742-2 2524752-1 RSA-7AA1 2524347-4 RSA-10AD1 2524163-8 2524163-7A 2524757-1 RSA-10DB1 2524275-9 2524649-3 RSA-10DB2 2524708-1 RSA-10ED1 2524273-5A 2524273-6 2524298-6 2524491-3 2524500-2A 2524500-3 2524693-2 2524709-1

Compliance required within the next 10 hours in service after the effective date of this AD, unless previously accomplished.

To prevent an in-flight power loss due to an over rich condition caused by the failure of the center body bellows seal assembly, replace the center body bellows seal assembly and tube bushing in accordance with Accomplishment and Identification instructions in the applicable Bendix Energy Controls Division Service Bulletin No. RS-52 Rev. 2 revised May 12, 1978, No. RS-53 Rev. 2 revised May 12, 1978, and No. RS-54 Rev. 2 revised May 10, 1978, or FAA approved equivalent.

Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration (FAA), Eastern Region.

As permitted by FARs 21.197 to 21.199, aircraft may be flown to a base where the modification required by this Airworthiness Directive can be accomplished.

NOTE: AVCO Lycoming Service Bulletins No. 428, No. 429 and No. 430 also pertain to this subject.

This amendment is effective November 7, 1978.