Airworthiness Directive · Amendment 39-18208 · Flight controls
PILATUS AIRCRAFT LTD. Airplanes
This AD applies to the following PILATUS AIRCRAFT LTD. model and serial number airplanes, certificated in any category.
(1) Model PC-12/47, manufacturer serial numbers (MSNs) 684 through MSN 888; and
(2) Model PC-12/47E, MSNs 545, and 1001 through 1520.
We are adopting a new airworthiness directive (AD) for PILATUS AIRCRAFT LTD. Model PC-12/47 and PC-12/47E 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 the aileron trim tab disconnecting above 10,000 feet altitude. 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 equipped with aileron trim tab assembly, part number (P/N) 527.15.12.037 or 527.15.12.038; or aileron assembly, P/N 557.05.12.015, 557.05.12.016, 557.05.12.017, or 557.05.12.018: Within 12 months after August 20, 2015 (the effective date of this AD), replace the aileron tab counter balance weight and re-identify the aileron trim tab assembly following the instructions of PILATUS PC-12 Service Bulletin No: 27-021, dated January 20, 2015.
(2) For airplanes that on August 20, 2015 (the effective date of this AD) has an aileron trim tab assembly, P/N 527.15.12.037 or 527.15.12.038, installed: After modification of that airplane as required by paragraph (f)(1) of this AD, do not install another aileron trim tab assembly with P/N 527.15.12.037 or 527.15.12.038.
(3) For airplanes that on August 20, 2015 (the effective date of this AD) does not have an aileron trim tab assembly, P/N 527.15.12.037 or 527.15.12.038, installed: After August 20, 2015 (the effective date of this AD), do not install an aileron trim tab assembly with P/N 527.15.12.037 or 527.15.12.038.
(4) For all airplanes: After August 20, 2015 (the effective date of this AD), you are allowed to install on an airplane an aileron assembly, having a P/N 557.05.12.015, 557.05.12.016, 557.05.12.017, or 557.05.12.018, provided that an aileron trim tab assembly, P/N 527.15.12.037 or 527.15.12.038 is not installed on that aileron assembly.
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.
