AD 98-20-28
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
The unsafe condition exists because flight crews are not provided with adequate information to determine when operating in icing conditions outside the certification envelope (Appendix C of part 25) and what actions to take, potentially leading to hazardous conditions if pilots remain in such icing conditions.
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Required Actions
Require AFM revisions to provide flight crews with visual cues to recognize icing conditions outside the certification envelope and procedures to safely exit such conditions, including expeditious exit requirements and proper use of deicing systems.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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