HP2 Valve Failed in the Closed Position with No CAS message F2000EXEASy/S/LX/LXS

Recently on incoming engine runs for scheduled maintenance, the West Star technicians operating the aircraft noticed on the Bleed Air Synoptic page that the HP2 valve showed closed and would not open at any point.

During any of the scenarios where the valve should be open, it would not open. No CAS message was present at any time during the Engine runs or functional checks. No physical airflow changes by manually selecting “off” or “auto”.

After swapping components, HP valves, PRVs, and the BASC, HP2 remained closed under all circumstances. Subsequently the wiring ring out was performed and verified that no opens or improper grounds were causing the issue.

It was discovered that PC card 426JE had failed and could not provide the required ground to open HP2 valve. Once 426JE was replaced, HP2 operated and indicated properly.

Since there was no CAS message on the warning panel with this failure, the crew would not be aware of an issue. A failure of the opposite HP1 would cause the aircraft to be limited to LP (Low Pressure) airflow. 

This situation shows the importance of thorough maintenance operational checks and incoming engine runs. The experience and systems knowledge of West Star Aviation Technicians play a huge role in keeping customer aircraft fully operational in the safest way possible.  For more information on this scenario or any of the West Star Aviation Falcon capabilities, please contact any of the Specialists listed below.