AD 85-16-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-6 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H1 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H2 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H1 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H2 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H1 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H2 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B-H2 | Airworthiness Directives; Pilatus Model PC-6 Series Airplanes |
Unsafe Condition
Cracks in the cap angles adjacent to the rudder hinge attachment points on the vertical stabilizer and cracks in the cap angles adjacent to the elevator bearing bracket attachment points on the horizontal stabilizer, as well as cracks in the front spar of the horizontal stabilizer adjacent to the elevator control cables pulley assembly, could lead to possible loss of airplane control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time-in-service after the effective date, inspect cap angles on vertical and horizontal stabilizers using dye penetrant tests and visually inspect the horizontal stabilizer front spar area. Corrective actions include replacing defective parts, modifying stabilizers, repairing cracks, installing repair plates, and repeating inspections every 100 hours time-in-service, with adjustments up to 10% of the interval allowed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated after the effective date of this AD, unless already accomplished.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Aircraft Limited Model PC-6 series airplanes with serial numbers 1 to and including 844, and 2001 to and including 2092 (excluding specific serial numbers 524, 676, 707, 710, and 816 for certain inspections).
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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