75-01-05 AVCO LYCOMING: Amendment 39-2063. Applies to all Avco Lycoming T5313B turboshaft engines.
Compliance required, unless already accomplished, prior to the accumulation of 100 hours time in service after the effective date of this AD.
To prevent possible centrifugal compressor impeller assembly vane failures leading to performance deterioration and partial or complete power loss, remove centrifugal compressor impeller assemblies, part numbers 1-100-078-03, 1-100-078-04, and 1-100-078-10 and replace with centrifugal compressor impeller assembly, part number 1-100-078-08.
Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.
NOTE: (Avco Lycoming Service Bulletin Number 0042 pertains to this subject.)
This amendment becomes effective January 17, 1975