AD 2020-22-17
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
Movement of the aft fuel pipe within the coupling when system pressure was applied, which can cause damage to the O-rings, leading to a fuel leak and fuel contamination of the rear fuselage.
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Required Actions
Replace each flexible saddle clamp with a fixed saddle clamp with P/N 946.33.21.933, align the left-hand (LH) and right-hand (RH) motive-flow fuel pipes, and test the LH and RH motive-flow fuel pipe for leaks in accordance with the Accomplishment Instructions, sections 3.B and 3.C, of Pilatus PC-24 Service Bulletin No. 28-002, dated May 3, 2019. Do not install a flexible saddle clamp with P/N 946.33.22.004 between frame 34 and 36 on any airplane.
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Compliance Time
Within 3 months after the effective date of this AD
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Affected Aircraft
Pilatus Aircraft Ltd. Model PC-24 airplanes, all serial numbers, certificated in any category, with a flexible saddle clamp part number (P/N) 946.33.22.004 installed between frame 34 and 36.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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