2023-01 · NASA ASRS report 1966883
C680 flight crew reported when the gear deployed receiving a Caution Message stating Low Hydraulic Volume. The flight crew discontinued the approach and ran the QRH and checklist. The flight crew requested priority handling and diverted to make a precautionary landing.
We were cleared for the visual into ZZZ we announced our position and stated that we were going to overfly the field at 2;000 feet MSL. Flaps were set to 7 degrees at 5 NM east of the field; then 15 degrees upon entering the downwind along with gear down. When the gear deployed is when we received a Caution Message stating Low Hydraulic Volume. I asked my Second in Command (SIC) to grab the abnormal checklist and run it. As they were running the checklist; I announced over UNICOM that we were departing the pattern and were going to remain about 5 miles east of the field in a holding pattern until the checklist was complete. Once the checklist was complete and we determined that we were going to be landing with emergency brakes only. We notified ZZZ Approach that we had an equipment failure of our hydraulics and that we would like to land at ZZZ1. As we were being vectored to ZZZ1 is when we decided that we were going to [request priority handling]. Upon approach to XXL we went over our actions upon landing. Once we touched down the SIC took control of the yoke and put the ailerons into the wind as I maintained control of the aircraft using the nose wheel steering and emergency braking. Once at a complete stop we started the APU and shut down the engines. Notified Airport Rescue and Firefighting (ARFF) crews that all the passengers were OK; and we didn't need any further assistance.
We were turning downwind for Runway YY and the PIC called for Gear Down. We received 3 Green and No Red but the Master Caution immediately Illuminated. An Amber Hydraulic Volume Low CAS Message appeared. The PIC remained at pattern altitude and continued flying the circuit as they called for the checklist. The checklist indicated that we would ultimately have to use emergency brakes so the Captain decided it would be safer to go to ZZZ1 with their longer runways and Airport Rescue and Firefighting (ARFF). We switched back to ZZZ and informed them of our issue. They cleared us to ZZZ1 and gave us vectors to XXL. We continued through the checklist and landed and stopped using the emergency brakes without incident.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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