AD 64-04-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aeronautica Macchi S.p.A. | AL 60 | Airworthiness Directives; Macchi Models AL.60 and AL.60B Aircraft |
| aircraft | Aeronautica Macchi S.p.A. | AL 60-B | Airworthiness Directives; Macchi Models AL.60 and AL.60B Aircraft |
Unsafe Condition
Fuel selector valves have defective internal 'O' rings and a spring of insufficient strength, resulting in internal leaks when in the closed position.
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Required Actions
Inspect fuel selector valves for internal leaks by operating the engine at maximum r.p.m. on ground, setting the valve to off, and checking if the engine stops within 15 seconds. Replace defective valves before further flight with modified fuel selector valve 67106-1.
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Compliance Time
within the next 10 hours' time in service after the effective date of this AD
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Affected Aircraft
Macchi Models AL.60 (Serial Numbers 6/6148, 7/6149, 8/6150, 9/6154, 10/6155, 11/6156, 13/6158, 14/6159) and AL.60B (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)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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