Challenger 350
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 160; Flight Crew Total 11800; Flight Crew Type 3100
Human-Machine Interface; Situational Awareness; Communication Breakdown; Confusion
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Aircraft
Aircraft Aircraft Damaged; Flight Crew Returned To Gate; General Maintenance Action
Human Factors; Procedure
As a crew we briefed the ground crew as our wingtip clearance was going to need wing-walker assistance to advise the Captain flying (Left wing) if there was ample clearance upon engine start to taxi phase at FBO. The crew briefed the ground crew and expected visual signals to be communicated as the Captain began to slowly taxi and to turn the nose wheel towards the right to avoid any contact with the other jets wing. I was sitting in the right seat watching our right wing and looking for any communication as to what the ground crew has shared with the Captain.  As the Captain slowly began to turn right after the engines were started the left wing clipped the other airplanes wingtip. I did not see any wing-walkers in front of me nor did I visually see a line man in front of me. In retrospect we should have been more demanding for (3) wing tip walkers. The lack of communication from the linemen were not par with what I have experienced especially given our circumstances. We notified Ground to cancel our taxi clearance; we ran the engine shutdown checklist and verified the airplane was chocked as we opened the main cabin door for an inspection.
Challenger 350 First Officer reported wingtip strike with another aircraft after the flight crew attempted to taxi out of parking with an insufficient number of wing-walkers present.