EASA Regulations for Pilatus PC-21

EASA AD 2024-0024

THOMMEN AIRCRAFT EQUIPMENT AG: Navigation — Digital Air Data Computer — Replacement

EASA Airworthiness Directive 2024-0024 is issued for Thommen Aircraft Equipment AG AC32 Digital Air Data Computers installed on aircraft including the AW 189, Pilatus PC-21, and Cessna 550, among others with Supplemental Type Certificates. The directive addresses a known issue with certain AC32.() digital air data computers that may stop functioning at temperatures below -20°C. It mandates the replacement of affected units to ensure continued safe navigation data provision.