AD 74-22-07

74-22-07 AVCO LYCOMING: Amendment 39-1997. Applies to all Avco Lycoming T5313A turboshaft engines. Compliance required, unless already accomplished, prior to the accumulation of 100 hours in service after the effective date of this AD. To prevent possible compressor disk or centrifugal impeller assembly failures leading to partial or complete loss of engine power, remove and replace the first, second, third, fourth, and fifth stage compressor rotor disks and centrifugal impeller assemblies in accordance with the table below.

Remove P/N 1st Stage Compressor 1-100-700-05 Rotor Disk Assembly Socket Head Cap Screw 1-100-214-06 2nd Stage Compressor 1-100-710-05 Rotor Disk Assembly 1-100-710-09 1-100-710-10 3rd Stage Compressor 1-100-230-06 Rotor Disk Assembly 1-100-230-07 4th Stage Compressor 1-100-240-08 Rotor Disk Assembly 1-100-240-10 1-100-240-15 5th Stage Compressor 1-100-450-09 Rotor Disk Assembly 1st Stage Compressor 1-100-201-05 Rotor Spacer 2nd Stage Compressor 1-100-202-03 Rotor Spacer 3rd Stage Compressor 1-100-203-03 Rotor Spacer 4th Stage Compressor 1-100-204-06 Rotor Spacer 5th Stage Compressor 1-100-416-07 Rotor Spacer Sleeve Seal 1-100-482-01 Centrifugal Compressor 1-100-440-07 Impeller Assembly Compressor Rotor 1-100-207-05 Sleeve Compressor Rear Shaft 1-100-137-04

Install P/N Front Shaft Assembly 1-101-080-01 Socket Head Cap Screw 1-100-506-02 Compressor Rotor 1-101-090-02 Subassembly Centrifugal Compressor 1-100-078-08 Impeller Assembly Compressor Rear Shaft 1-100-501-01 Lock Cup Washer 1-100-148-01 Double Hexagon Extended 1-100-502-02 Washer Head Bolt

Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, New England Region, may adjust the compliance time. NOTE: (Avco Lycoming Service BulletinNumber 0037 pertains to this subject.) This amendment is effective October 31, 1974.