AD 71-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aerostar Aircraft Corporation | PA-60-600 (Aerostar 600) | Airworthiness Directives; Aerostar Model 600 and 601 Airplanes |
| aircraft | Aerostar Aircraft Corporation | PA-60-601 (Aerostar 601) | Airworthiness Directives; Aerostar Model 600 and 601 Airplanes |
Unsafe Condition
Improper grounding of overvoltage relays may result in electrical continuity issues between the relay base and aircraft structure, leading to potential electrical malfunctions.
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Required Actions
Inspect overvoltage relay installations and verify low resistance continuity (less than 1 ohm) between relay base and aircraft structure. Ground relay base to structure if continuity is unsatisfactory. For other models, inspect crimp wire terminals, rearrange components with specified parts (nylon bearing, washers, screw), and ensure proper electrical isolation and continuity. Equivalent FAA-approved modifications are acceptable if existing installations cannot meet requirements.
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Compliance Time
within the next 10 hours' time in service after the effective date of this AD, unless already accomplished
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Affected Aircraft
Aerostar Aircraft Corporation Model 600 (PA-60-600) and 601 (PA-60-601) airplanes, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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