EASA 2020-0200

Requires upgrading the utility management system software to version 7.3. Prompted by an occurrence where, during climb, a PC-24 suffered a dual Ethernet communication channel failure on a dual-channel data concentration and processing unit. This triggered the opening of electronic circuit breakers that resulted in the degradation of environmental control system functionalities, deployment of all passenger oxygen masks, and the autopilot entering emergency descent mode. Various crew alerting system messages were also displayed during this failure and the functionality of other systems—including flaps, fuel indication, and the ice protection system—were “significantly degraded.”