64-04-04 MACCHI: Amdt. 682 Part 507 Federal Register February 8, 1964. Applies to Aircraft Model AL.60 Serial Numbers 6/6148, 7/6149, 8/6150, 9/6154, 10/6155, 11/6156, 13/6158, 14/6159, and Model AL.60B Aircraft Serial Numbers 5/6147, 16/6161, 17/6162, 18/6163, 19/6164, 20/6165, 21/6166, 24/6169, 25/6170, 31/6211, 32/6212, 33/6213, 34/6214, 39/6219, 40/6220, 41/6221, 50/6230.
Compliance required as indicated.
Fuel selector valves in service have been found with defective internal "O" rings and a spring of insufficient strength. This has resulted in internal leaks through the fuel selector valve when in the closed position.
(a) In order to determine whether an internal leak exists in the fuel selector valve make the following inspection within the next 10 hours' time in service after the effective date of this AD.
(1) Operate the engine at maximum r.p.m. on ground.
(2) Set the fuel selector valve to the off position.
(3) If the engine does not stopwithin 15 seconds the fuel selector valve is defective and must be replaced, before further flight, with a modified fuel selector valve designated as 67106-1.
(Macchi Service Bulletin No. 7 dated October 1, 1963, covers the same subject.)
This directive effective March 9, 1964.