The investigation was based of the log file of the affected device and the reported information.The analysis of the log entries shows that a persistent hard disc error was the root cause for the reported problem.After replacement, the issue was solved, and the device was functional again.If the disk drive is not accessible for the microprocessor system, the safety software initializes a warmstart of the cockpit infinity c500.If the disk drive is not accessible even during the warm start, the cockpit's boot process cannot be completed.A corresponding error message is displayed on the black screen and the acoustic auxiliary alarm is activated after 45 seconds at the latest.The ventilation is not affected by a warmstart of the cockpit.Safety relevant parameters as fio2, minute volume, or airway pressure are displayed in the supplemental oled-display located on the ventilation unit wherein the user can see the on-going ventilation.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.
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