Airworthiness directives › 2021-04-03
AD 2021-04-03 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
Makes named: pilatus. Models named: PC-24. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
(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. Table 1 to Paragraph ( f )(1)—Evaporator Filter Assemblies 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.
Required actions
The Manager, General Aviation & Rotorcraft Section, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to Doug Rudolph, Aviation Safety Engineer, FAA, General Aviation & Rotorcraft Section, International Validation Branch, 901 Locust, Room 301, Kansas City, Missouri 64106; phone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@faa.gov. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office.
Unsafe condition
This AD was prompted by a reported occurrence where, during production, cockpit and cabin evaporator filters produced with degraded fire retardant properties were installed on some Model PC-24 airplanes. The FAA is issuing this AD to detect improper cockpit and cabin evaporator filters installed on Model PC-24 airplanes. The unsafe condition, if not addressed, could result in filters with degraded fire retardant properties, resulting in smoke in the cockpit and cabin in the event of electrical heater over-temperature.
Affected ADs
None.
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