AD 71-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-6 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
Unsafe Condition
The use of safety wires on aileron, rudder, elevator, flap, and trim cable turnbuckles that do not meet Military Standard 20995C47, 20995C32, or 33591 specifications for size, corrosion resistance, or method of safetying could result in turnbuckle failure and loss of flight control effectiveness.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect aileron control cable turnbuckles for compliant safety wires before further flight. Inspect rudder, elevator, flap, and trim cable turnbuckles within 50 hours' time in service after the effective date or before November 15, 1971, whichever is sooner. Replace non-compliant safety wires before further flight, allowing flight under FAR 21.197 to a repair base.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight (for aileron inspections) and within 50 hours' time in service after the effective date or before November 15, 1971, whichever occurs sooner (for other inspections and replacements).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Model PC-6 (Heli-Porter) airplanes manufactured by Fairchild Hiller.
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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