Date: 202010
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: B767-200
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Cargo / Freight / Delivery
Flight phase: Parked
Aircraft component: Fuel Quantity-Pressure Indication
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Human factors: Confusion
Second reporter function: Captain; Pilot Flying
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Detector: Person Flight Crew
When detected: In-flight; Aircraft In Service At Gate
Result: Flight Crew Overcame Equipment Problem; General Maintenance Action
Contributing factors: Human Factors; Aircraft; Procedure
Primary problem: Procedure

Narrative: The aircraft's left fuel indicator was MEL'd and was blank. Following the MEL procedure; the Captain spoke with the Maintenance crew about the fuel numbers. Before our arrival; Maintenance accomplished the fuel stick procedure to verify the amount of fuel in each wing and total fuel to upload. We where told each side was balanced and the total fuel load was 37;500 lbs. Maintenance provided us with the chart they used to load the fuel and their explanation in writing. Everything they showed us looked correct. However; in flight we began to wonder about the accuracy as the Captain examined the papers he gave us and the current readout on the remaining right indicator. The fuel flow was matched and consistent between both engines the entire flight. The calculated number in the FMC was off from the right side indicator. There is no other way to tell if we had an imbalance to my knowledge; that's why the starting fuel load is critical to have balanced. As we approached ZZZ the Captain disconnected the A/P to feel for an imbalance. The aircraft was trimmed perfectly and neither side felt heavy. The Captain landed the aircraft normally. On the post flight checks Maintenance was outside sticking the tanks. The Captain asked him what the numbers were and he said 11;000 lbs of fuel remained in the left tank; 6;000 lbs in the right and 600 pounds in the center. The Captain couldn't believe there seemed to be an imbalance of 5;000 lbs. I'm not sure that was true because the aircraft seemed to fly wings level in flight. When we left I never got the chance to see if Maintenance had incorrectly calculated those numbers of if there actually was an imbalance.


Second narrative: The aircraft's left fuel indicator was MEL'd and was blank. Following the MEL procedure I spoke with the  Maintenance crew about the fuel numbers. Before our arrival they accomplished the fuel stick procedure to verify the amount of fuel in each wing and total fuel to upload. I was told each side was balanced and the total fuel load was 37;500 lbs.  Maintenance provided me with the chart they used to load the fuel and their explanation in writing. Everything they showed me looked correct. However; in flight I began to wonder about the accuracy as I examined the papers he gave me and the current readout on the remaining right indicator. The fuel flow was matched and consistent between both engines the entire flight. The calculated number in the FMC was off from the right side indicator. There is no other way to tell if we have an imbalance to my knowledge; that's why the starting fuel load is critical to have balanced. As we approached ZZZ I disconnected the AP to feel for an imbalance. The aircraft was trimmed perfectly and neither side felt heavy. I landed the aircraft normally. On the post flight checks  Maintenance was outside sticking the tanks. I asked him what the numbers were and he said 11;000 LBS of fuel remained in the left tank; 6;000 LBS in the right and 600 pounds in the center. I couldn't believe there seemed to be an imbalance of 5;000 LBS. I'm not sure that was true because it didn't feel like an imbalance existed. When we left I never got the chance to see if  Maintenance had incorrectly calculated those numbers of if there actually was an imbalance. We must have confidence  Maintenance personal knows how to stick the tanks and calculate accurate numbers for the fuel load and balance. FMC burn calculation showed an even burn rate and no imbalance but ZZZ said there was. Either fueled the airplane incorrectly and told me it was ok or ZZZ didn't correctly calculate the fuel remaining. There seems to be confusion by  Maintenance about how to properly conduct the tank stick procedure.


Synopsis: Flight Crew reported concerns over a fuel imbalance with an inoperative Fuel Quantity Indicator .