Citation X (C750)
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial
Distraction; Workload
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Diverted; Flight Crew FLC complied w / Automation / Advisory
Aircraft
Upon takeoff and after raising the landing gear; we got a down and unlock nose gear warning. After looking at the abnormal checklist; we brought the gear handle down and got an all wheels down and lock annunciation. Almost immediately; a HYD VOLUME LOW A (CAS message) appeared. When I looked at the hydraulic gauge for the A system; it read 0 quantity. We completed the abnormal checklist; secured the A hydraulic system and [advised ATC]. We came back to the airport and landed uneventfully; stopping the aircraft on the runway. The fire department as well as an [FBO] tug were standing by and rushed to help once we stopped the aircraft. Fire department checked for excess heat on all brakes and [FBO] towed us back to the ramp.
Citation pilot reported a hydraulic system failure that resulted in a return to land.