Airworthiness Directive · Amendment 39-16997 · Stabilizer
Pilatus Aircraft Ltd. Airplanes
Superseded. A later AD replaced this one: AD 2021-24-22. Comply with the one in force.
This AD applies to Pilatus Aircraft Ltd. Models PC-6, PC-6-Hl, PC-6-H2, PC-6/350, PC-6/350-Hl, PC-6/350-H2, PC-6/A, PC-6/A-Hl, PC-6/A-H2, PC-6/B-H2, PC-6/Bl-H2, PC-6/B2-H2, PC-6/B2-H4, PC-6/C-H2, and PC-6/Cl-H2 airplanes, all Pilatus manufacturer serial numbers (MSN), and MSN 2001 through 2092, certificated in any category.
Note 1 to paragraph (c) of this AD: For MSN 2001-2092, these airplanes are also identified as Fairchild Republic Company PC-6 airplanes, Fairchild Industries PC-6 airplanes, Fairchild Heli Porter PC-6 airplanes, or Fairchild-Hiller Corporation PC-6 airplanes.
We are adopting a new airworthiness directive (AD) for Pilatus Aircraft Ltd. Models PC-6, PC-6-H1, PC-6-H2, PC-6/350, PC-6/350-H1, PC- 6/350-H2, PC-6/A, PC-6/A-H1, PC-6/A-H2, PC-6/B-H2, PC-6/B1-H2, PC-6/B2- H2, PC-6/B2-H4, PC-6/C-H2, and PC-6/C1-H2 airplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as loose elevator and rudder hinge bolts caused by incorrect torquing and locking of the bolts, which could lead to in-flight failure of the elevator or rudder attachment. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions:
(1) For airplanes that have not been modified before May 4, 2012 (the effective date of this AD) following Pilatus Aircraft Ltd. PC-6 Service Bulletin No. 55-001 at initial issue, within 2 months after May 4, 2012 (the effective date of this AD), install new elevator and rudder hinge bolt locking screws and modify the installation of the hinge bolt following the Accomplishment Instructions in Pilatus Aircraft Ltd. PC-6 Service Bulletin No. 55-001, Rev. No. 1, dated November 25, 2011.
(2) For airplanes that have been modified before May 4, 2012 (the effective date of this AD) following Pilatus Aircraft Ltd. PC-6 Service Bulletin No. 55-001 at initial issue, within 6 months after May 4, 2012 (the effective date of this AD), install new elevator and rudder hinge bolt locking screws following the Accomplishment Instruction of Pilatus Aircraft Ltd. PC-6 Service Bulletin No. 55-001, Rev. No. 1, dated November 25, 2011.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
