AD 2020-21-23
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
horizontal stabilizer rear attachment bolts that had not received correct heat treatment during the manufacturing process
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
replace each horizontal stabilizer rear attachment bolt P/N 555.10.12.139 marked with production order number FAUF 10169753, FAUF 10171067, or FAUF 10171267 by following the Accomplishment Instructions, section 3.B.(2) through (4) and figures 1 and 2, of Pilatus PC-12 Service Bulletin No. 55-004, dated March 29, 2019
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 1,350 hours time-in-service after the effective date of this AD or within 13 months after the effective date of this AD, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Aircraft Ltd. Models PC-12, PC-12/45, PC-12/47, and PC-12/47E airplanes, all serial numbers, certificated in any category, with a horizontal stabilizer rear attachment bolt part number (P/N) 555.10.12.139 marked with production order number FAUF 10169753, FAUF 10171067, or FAUF 10171267 installed
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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