Airworthiness Directive · Amendment 39-17320 · Fuselage
PILATUS Aircraft Ltd. Airplanes
This AD applies to PILATUS Aircraft Ltd. Models PC-7 airplanes, serial numbers 101 through 618, certificated in any category.
We are adopting a new airworthiness directive (AD) for PILATUS Aircraft Ltd. Model PC-7 airplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cracks in the engine mount fittings caused by stress corrosion. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions.
(1) Within the next 90 days after February 7, 2013 (the effective date of this AD), perform a conductivity test to identify the material specification of the engine mount fittings (part number (P/N) 112.35.07.152) following paragraph 3.B. of PILATUS Aircraft Ltd. PILATUS PC-7 Service Bulletin No. 53-008, dated November 30, 2012.
(2) If during the conductivity test required by paragraph (f)(1) of this AD, engine mount fittings made of aluminum alloy AA2024-T351 are found, within the next 90 days after February 7, 2013 (the effective date of this AD), do the inspection following paragraph 3.C. of PILATUS Aircraft Ltd. PILATUS PC-7 Service Bulletin No. 53-008, dated November 30, 2012.
(3) If during the inspection required by paragraph (f)(2) of this AD, any crack is found in the engine mount fittings, before further flight, contact Pilatus Customer Technical Support (MCC) for further instructions at P.O. Box 992, CH-6371 Stans, Switzerland; telephone: +41 (0)41 619 67 74; fax: 41 (0)41 619 67 73; Internet: http://www.pilatus aircraft.com or email: Techsupport@pilatus-aircraft.com.
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.
Aircraft
