Challenger 300
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Distraction; Confusion; Situational Awareness
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Landed in Emergency Condition; Flight Crew Diverted
Aircraft
Was in cruise at FL450; approximately one hour prior to intended arrival. I was assigned as FO (First Officer) on this flight and was Pilot Monitoring/Pilot Not Flying this leg. The Captain and I had just finished our arrival brief for descent and approach. My EFB iPad was in my left hand; and I turned towards the pedestal to mention something to the Captain; I inadvertently dropped the iPad and I saw it hit the aft-of-pedestal flight manual cubbyhole and ultimately the iPad came to rest on the cabin floor just aft of the step up to the flight deck. I considered releasing the seat belt to enable me to retrieve the iPad when I heard a subtle change of aircraft noise. The Captain and I both noticed it about the same time. I looked at him and said something to the effect of 'what's that?' and we both looked at EICAS to see indication of the right engine slowing losing thrust. I concurred with the Captain that it appeared we had lost power on the engine and we both started looking at the pedestal and engine controls to see what might be amiss. We requested and received clearance to a lower altitude from ZNY Center. Thrust lever positioning appeared to be normal and matched with the left engine and the engine run switch was on. I did note that the fire extinguisher system (guarded) pushbuttons were illuminated ARMED for both engines. We ran the QRH for loss of engine in flight and seeing no indication of engine damage and with apparent core rotation; decided to attempt to relight the engine. Multiple attempts were unsuccessful. Priority handling was requested and the decision was made to divert into ZZZ; where a single-engine landing was accomplished.I keep thinking that somehow the iPad incident might have bumped a switch as it fell to the floor - but all switches and controls were in the normal position. What is unusual is FADEC apparently tried to relight the engine; we had a START indication on the engine without us commanding it - we noted this while running the checklists.Not sure if any of my actions contributed to the unexplained engine failure. I have heard anecdotally that there have been some instances of unexplained rollbacks on this engine.
CL-300 First Officer reported sudden right engine failure; prompting a diversion and landing.