Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Air Traffic Control Military 22; Air Traffic Control Supervisory 15; Flight Crew Last 90 Days 81.5; Flight Crew Total 6500; Flight Crew Type 30
Human-Machine Interface; Situational Awareness; Distraction
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Vehicle
Aircraft Aircraft Damaged; General Maintenance Action; General Flight Cancelled / Delayed
Procedure; Aircraft; Human Factors
The aircraft was parked and unpowered. This incident occurred during the early stages of the pre-flight. I set the parking brake thinking that accumulator was charged. Then I exited the aircraft and removed the chocks. The aircraft started to roll and impacted a vehicle parked on the ramp about 20 feet away. The way to avoid any occurrence like this is to turn on the battery and allow the hydraulic pump to charge the brake system.
First Officer reported setting the aircraft parking brake but not charging the brake accumulator with battery power prior to removing the wheel chocks. First officer reported that the aircraft began to roll; moving 20 feet before hitting a parked vehicle.