Airworthiness Directive · Amendment 39-21991 · Aircraft fuel system
Pilatus Aircraft Ltd. Airplanes
This AD applies to Pilatus Aircraft Ltd. Model PC-12/47E airplanes, serial number (S/N) 1720 and S/N 2001 and larger, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-12/47E airplanes. This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as inward vent valves installed during production without chromate conversion coating on the bonding surface. This AD requires modifying the inward vent valves and prohibits installing unmodified inward vent valves. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Group 1 airplanes: Airplanes with an inward vent valve part number (P/N) 963.04.26.520 installed with a serial number listed in section 1.C(1) of Pilatus Service Bulletin No. 28-015, dated October 12, 2020 (Pilatus SB 28-015).
(2) Group 2 airplanes: Airplanes without an inward vent valve P/N 963.04.26.520 installed with a serial number listed in section 1.C(1) of Pilatus SB 28-015.
For Group 1 airplanes, within 1,200 hours time-in-service after the effective date of this AD or within 9 months after the effective date of this AD, whichever occurs first, modify each inward vent valve in accordance with the Accomplishment Instructions and Rework Instructions in Pall Corporation Service Bulletin SB9337-01-29-01, Issue 1, dated September 22, 2020 (Pall SB9337-01-29-01, Issue 1).
For all airplanes, as of the effective date of this AD, do not install an inward vent valve P/N 963.04.26.520 that has a serial number listed in section 1.C(1) of Pilatus SB 28-015 on any airplane, unless it is modified in accordance with the Accomplishment Instructions and Rework Instructions of Pall SB9337-01-29-01, Issue 1.
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.
