AD 99-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-12 | Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-12/45 | Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes |
Unsafe Condition
Flap drive shafts may corrode to the point where the flexible shafts in the flap drive system rupture, resulting in inability to utilize the flap system with reduced airplane control.
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Required Actions
Replace all flap drive shafts with improved design part numbers 945.02.02.201 and 945.02.02.202, install additional gaskets on the power drive unit, and modify attachment and supporting hardware per Pilatus Service Bulletin No. 27-003.
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Compliance Time
Within 4 calendar months after the effective date (October 1, 1999)
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Affected Aircraft
Pilatus Models PC-12 and PC-12/45, serial numbers 101 through 239
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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