AD 98-11-01 R2
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
Moisture entering the fuel tank inward vent valve and freezing after a cold soak at altitude could result in wing airfoil distortion, structural damage, and degradation of the airplane's handling qualities.
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Required Actions
Replace fuel tank vent valves with modified ones per Pilatus Service Bulletin No. 28-003, Revision 1; drill a 4.8 millimeter hole in each fuel filler cap per Pilatus Service Bulletin No. 28-004; insert a temporary POH revision checking fuel filler cap hole clearance from ice and foreign objects.
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Compliance Time
Within the next 10 hours time-in-service after December 1, 1997 (for vent valve replacement) and within the next 10 hours TIS after June 7, 1998 (for drilling and POH insertion).
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Affected Aircraft
Pilatus Aircraft, Ltd. Models PC-12 and PC-12/45 airplanes; serial numbers 101 through 230, certificated in any category.
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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