Cessna Citation Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Confusion; Distraction; Troubleshooting; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Taxiway
Flight Crew Overcame Equipment Problem
Aircraft; Human Factors
We flew four passengers (pax) to LAS; departing ZZZ at XA09 local; 39 min delay for late pax.  Plan was to depart LAS at XF30 and fly the same four pax back to ZZZ. When de-planning the lead pax said that they may be getting back to the plane early.  At XE30 I pre-flight[ed] the plane (during which I pulled the Chocks from the main landing gear; nose wheel was still chocked) and started the APU. After APU start I set the parking brake; per the checklist.  After setting the brake I noticed a 'Rudder Limiter Failure' CAS message.I shut everyone down and did a 10 min reboot of the plane. I started the APU back up; set the parking brake again (it was never released). The rudder limiter message was gone and I finished the Acceptance checklist. After getting the cockpit ready I went into the cabin to put away some personal items. After this; I got back in the pilot's seat and then [copilot] and I conducted a Turn Before Start checklist. After completing the Turn Before Start checklist; I went into the lobby in case the passengers came in through there; [copilot] stayed in the plane. As I left I pulled the nose wheel chocks. The time was now about XF05. The pax arrived in the lobby about XF15. At about XF20 I receive a text from [copilot] asking if I had pulled the Chocks. He had just stopped the plane as it had rolled forward 25 to 50 feet.  The nose of the plane did cross into the movement area of taxiway H in front of [FBO].  The pax were loaded and we taxied out at XF26 local. Normally I will ask the crew in the plane if the brakes are set before pulling the chocks. But; this time I did not and neither did I stick my head in the cockpit to double check; which I also normally do; since I set the brakes myself.  Being late at night and limited line personnel; I want to pull the chocks while they were on my mind. Lesson learned is not to pull the chocks without confirming that the brakes are set and until the passengers are on board for every flight at all times of the day.
A Citation pilot; after starting the APU; set the parking brake per the checklist. He noticed a 'Rudder Limiter Failure' CAS message; rebooted the aircraft and noted that the parking brake was still set. He then pulled the remaining chocks from the aircraft and went in to the terminal. The other pilot texted him that the aircraft had rolled forward by 25 to 50 feet.