76-07-14 AERONAUTICA MACCHI: Amendment 39-2578. Applies to Models AL-60 and AL-60B airplanes, certificated in all categories.
Compliance is required as indicated.
To detect cracks in the engine mounting plates and to prevent possible failure of the engine mount, accomplish the following:
(a) Within the next 10 hours time in service after the effective date of this AD, unless already accomplished, and thereafter at intervals not to exceed 50 hours time in service from the last inspection until modified in accordance with paragraph (d) of this AD, comply with the following:
(1) Inspect the areas around the periphery of each of the four engine mounting plates for cracks using a dye-penetrant method.
(2) Inspect the surfaces inside the concavity of each of the four engine mounting plates, where the lower shock mounts and attaching bolts are inserted, for cracks, using a dye penetrant method, in accordance with Aeronautica Macchi Mandatory Service Bulletin SB-L-0003, dated October 29, 1974, or an FAA-approved equivalent.
(b) If a crack is found during an inspection required by paragraph (a) of this AD, before further flight, comply with paragraph (d) of this AD.
(c) If no cracks are found during any of the inspections required by paragraph (a) of this AD, within the next 100 hours time in service after the effective date of this AD, or before the accumulation of 1200 hours total airplane time in service, whichever occurs later, comply with paragraph (d) of this AD.
(d) Modify each of the four engine mounting plates by adding a reinforcement plate, P/N 6070-47, and replacing the mounting plate shim, P/N 6005, with a new designed shim, P/N 6005A, in accordance with Aeronautica Macchi Mandatory Modification Bulletin, MB-L-0001, Change 1, dated March 5, 1975, or an FAA- approved equivalent.
This amendment becomes effective April 26, 1976.