71-13-01 AVCO LYCOMING: Amdt. 39-1231. Applies to TIO 540-A series engines with serial numbers lower than 1931-61.
Compliance required within the next 50 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent possible failures of the fuel injector manifold to nozzle tube assemblies accomplish the following:
1. Visually inspect each tube assembly for fuel stains, cracks, dents and bend radii under 5/8 inch. Replace cracked or dented lines and increase bends to 5/8 inch or more without denting or kinking before further flight.
2. Install support clamps in accordance with the instructions contained in Lycoming Service Bulletin No. 335 or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This amendment is effective June 22, 1971.