AD 2022-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus | Aircraft Ltd | Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes |
Unsafe Condition
An occurrence was reported where, on the production line, a batch of inward vent valves without a chromate conversion coating on the bonding surface were installed on some PC-12/47E aeroplanes. Such inward vent valves are not in compliance with the latest approved design data. This condition, if not corrected, could lead to corrosion, consequent degradation of the electrical bonding to Rib 16, and in case of lightning strike, to arcing between the ungrounded equipment and the primary structure, possibly resulting in a fire and reduced control of the aeroplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modifying the inward vent valves and prohibiting installing unmodified inward vent valves.
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Compliance Time
Before further flight
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Affected Aircraft
Pilatus Model PC-12/47E airplanes with serial number 1720 and serial number 2001 and higher.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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