63-07-02 MACCHI: Amdt. 548 Part 507 Federal Register April 2, 1963. Applies to All Models AL-60 (formerly LASA 60) and AL-60B Aircraft.
Compliance required as indicated.
As a result of several cases of engine exhaust manifold failures, accomplish the following within the next 25 hours' time in service after the effective date of this AD, and thereafter within every 25 hours time in service from the last inspection.
(a) Inspect the turbo inlet assembly manifold P/N 629-250 for cracks in the weld area between the two exhaust pipes.
(b) If cracks are found, replace or repair the part before further flight. Repair by arc welding a stainless steel plate reinforcement over the area in accordance with Aeronautical Macchi Service Bulletin No. 1, or FAA approved equivalent repair.
This directive effective May 2, 1963.