EMB-505 / Phenom 300
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition; Flight Crew Diverted; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure; Equipment / Tooling
At cruise the crew observed a projected -350 lb. fuel load at destination. This is unusually low for this phase of flight. The crew closely monitored the fuel situation and over the next 20 minutes and determined a worsening condition. The crew recalculated the flight plan; asked for direct to the airport to troubleshoot and identify the problem. All efforts did not resolve the issue. The crew [advised ATC] and diverted to ZZZ. On the way to ZZZ the fuel over destination worsened and the crew requested a closer alternate destination of ZZZ1.MFD indicating a negative fuel quantity upon or arrival.Reviewed flight plan; also requested direct routing to arrival fix for recalculation of fuel at FOD (Fuel Over Destination). Still showed a negative fuel balance and deteriorating.
Aircraft fuel condition showed a predicted (landing) negative fuel amount upon level off and continued to worsen throughout cruise flight. Crew requested and received shortcuts with ATC to shorten total flight distance. As a precaution the crew opted to divert as the information being provided by the aircraft showed progressively worsening fuel status all the way to the touchdown at ZZZ1. Upon level off; noticed the fuel over destination (FOD) showed -300 lbs. of fuel. The condition worsened as the flight progressed. The total fuel on board was checked to see/compare against current duration of flight which showed we had used more than expected. The crew asked for a turn away from the current 100+ [kts.] headwind to see if the FOD would recalculate based on a tailwind. This made an insignificant difference and continued to worsen. We could have tried to further troubleshoot prior to diverting but with passengers onboard we opted to error on the side of caution and land sooner than later.
Flight Crew reported diverting after FOD Fuel Over Destination showed a total loss of fuel in flight.