Airworthiness Directive · Amendment 39-18620 · Fuselage
PILATUS Aircraft Ltd. Airplanes
This AD applies to PILATUS Aircraft Ltd. Model PC-7 airplanes, manufacturer serial numbers (MSN) 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 an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as stress corrosion cracking on the main frame on frame 11 left and right fittings. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the actions in paragraphs (f)(1) through (4) of this AD:
(1) Within the next 120 days after September 30, 2016 (the effective date of this AD), check the material specification of the Frame (FR) 11 left fitting part number (P/N) 112.35.07.489 and the FR 11 right fitting P/N 112.35.07.490 following the Accomplishment Instructions in paragraph 3.B. of PILATUS Aircraft Ltd. PC-7 Service Bulletin No: 53-013, dated February 25, 2016.
(2) If fittings made of aluminum alloy AA2124-T851 are found during the inspection required by paragraph (f)(1) of this AD, within 30 days after the inspection or within the next 30 days after September 30, 2016 (the effective date of this AD), whichever occurs later, report the inspection results following the reporting requirements in paragraph 3.D. of PILATUS Aircraft Ltd. PC-7 Service Bulletin No: 53-013, dated February 25, 2016.
(3) If fittings made of aluminum alloy AA2024-T351 are found during the inspection required by paragraph (f)(1) of this AD, before further flight, and repetitively thereafter at intervals not to exceed 12 months, inspect FR 11 left fitting, P/N 112.35.07.489 and the FR 11 right fitting, P/N 112.35.07.490, for cracks following the Accomplishment Instructions in paragraph 3.C. of PILATUS Aircraft Ltd. PC-7 Service Bulletin No: 53-013, dated February 25, 2016.
(4) If cracks are found during any inspection required in paragraph (f)(3) of this AD, before further flight, replace the fittings following the Accomplishment Instructions in paragraph 3 of PILATUS Aircraft Ltd. PC-7 Service Bulletin No: 53-014, dated February 25, 2016.
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
