Airworthiness directives › 2020-21-23
AD 2020-21-23 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
Makes named: pilatus. Models named: PC-12, PC-12/45, PC-12/47, PC-12/47E. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to 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.
Compliance
(1) 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, 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, except you are not required to return parts to the manufacturer. (2) As of the effective date of this AD, do not install a horizontal stabilizer rear attachment bolt P/N 555.10.12.139 marked with production order number FAUF 10169753, FAUF 10171067, or FAUF 10171267 on any airplane.
Required actions
The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Doug Rudolph, Aerospace Engineer, FAA, General Aviation & Rotorcraft Section, International Validation Branch, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@faa.gov. Before using any approved AMOC, notify your appropriate principal inspector (PI), or lacking a PI, your local Flight Standards District Office.
Unsafe condition
This AD was prompted by a report of horizontal stabilizer rear attachment bolts that had not received correct heat treatment during the manufacturing process. The FAA is issuing this AD to prevent fatigue failure of a bolt and subsequent loss of airplane control.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1