Airworthiness Directive · Amendment 39-21424 · Air conditioning system
Pilatus Aircraft Ltd. Airplanes
This AD applies to Pilatus Aircraft Ltd. Model PC-24 airplanes, all serial numbers, certificated in any category, with any of the following evaporator filter assemblies installed, or if the part number (P/N) of the evaporator filter assembly is unknown:
(1) Cockpit filter assembly P/N 959.90.20.291 (PC24EC-6068-1);
(2) Cabin front filter assembly P/N 959.90.20.290 (PC24EC-6287-1);
(3) Cabin bottom filter assembly P/N 959.90.20.288 (PC24EC-6288-1); or
(4) Cabin top filter assembly P/N 959.90.20.289 (PC24EC-6297-1).
Note 1 to paragraph (c): The P/N in parenthesis is an alternative vendor P/N.
The FAA is adopting a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-24 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 improperly manufactured cockpit and cabin evaporator filters installed during production on some PC-24 airplanes. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 4 months after the effective date of this AD, unless already done, remove each filter assembly from service and replace with a filter assembly as specified in table 1 to paragraph (f)(1) of this AD by following the Accomplishment Instructions, sections 3A. through 3C., of Pilatus PC-24 Service Bulletin No. 21-006, dated April 3, 2020.
| Item | Remove filter P/N | Replace with filter P/N |
|---|---|---|
| Cockpit filter assembly | P/N 959.90.20.291 or PC24EC-6068-1 | P/N 959.90.20.303 or PC24EC-6068-5. |
| Cabin front filter assembly | P/N 959.90.20.290 or PC24EC-6287-1 | P/N 959.90.20.304 or PC24EC-6287-5. |
| Cabin bottom filter assembly | P/N 959.90.20.288 or PC24EC-6288-1 | P/N 959.90.20.305 or PC24EC-6288-5. |
| Cabin top filter assembly | P/N 959.90.20.289 or PC24EC-6297-1 | P/N 959.90.20.306 or PC24EC-6297-5. |
(2) As of the effective date of this AD, do not install an evaporator filter assembly with a P/N listed in paragraph (c) of this AD on any airplane.
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.
