Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Inflight Event / Encounter Fuel Issue
General None Reported / Taken
Aircraft
The Captain; who is quite experienced; hypothesized that this scenario may have been caused by the movement of fuel while accelerating and climbingIt is not clear whether this scenario is associated with the FCOM1 Ch. 28 NOTE concerning Fuel entering the center tank from the vent system and causing erroneous center tank quantity indications as high as 300 lbs [over takeoff limit].Weight Restricted departure from ZZZ. When Takeoff Performance Data was received; it was noted that prior to Takeoff; fuel quantity must be less than 9652.The Captain briefed that we would taxi out with both engines and APU on; and requested I coordinate with ATC to taxi to a location where we could burn the necessary fuel prior to takeoff.As directed by ATC; we taxied to hold short of Runway XX; and for the next 25 or so minutes burned fuel at this location. Once within approximately 60 lbs of the target 9650; APU was switched off and Captain directed me to advise ATC that we would soon be ready for departure. The Before Takeoff Checklist was completed and fuel verified above MIN FUEL and; at that moment; just 40 lbs above the 9650 maximum fuel for takeoff.We were subsequently cleared for takeoff; and during the acceleration; it was noted that the total FOB was surprisingly increasing by several hundred pounds; and the center tank quantity was increasing. At the moment of rotation; the FOB showed several hundred pounds more than the 9620 we confirmed prior to accepting Takeoff clearance. During initial climb center tank quantity continued to increase up to approximately 200 lbs.If this scenario was related to the FCOM1 NOTE; it would be educational to include this NOTE in the Fuel System CBT Training as a gentle reminder to all.
C550 First Officer reported a dynamic fuel quantity indication resulting in Maximum Take Off Fuel quantity exceedance.