A300 captain reported receiving a maintenance report stating burn residue found at the terminal end ...

Narrative:

At the top of the descent the ECAM fuel display for the right inner tank went to 'xx.X'. Fuel in this tank was approximately zero at this point. This lack of signal caused the fuel totalizer; cg; gross weight of the airplane to also go to xx.X. Per the QRH; there are two circuit breaker's (P60/P61) that we are advised to reset to restore the fuel quantity indication. That action only corrected the problem intermittently. We landed in ZZZ and maintenance troubleshot and signed off on the fuel system as airworthy. The same problem recurred on the flight from ZZZ to ZZZ1. Again; we followed the QRH circuit breaker procedure; but still; it did not fix the problem. We landed and wrote up the aml. I received a maintenance report on [date] in ZZZ1 stating that they found burn residue at the terminal end of the probes inside that fuel tank. I would like to ensure that the right folks are aware of this incident to determine if we have a systemic issue here with the hardware (arcing in an empty fuel tank) or the QRH procedure when we are resetting power to the cadensicon probes. The gravity of the threat of a fuel tank explosion should be apparent to us all. Recommend that this issue be investigated to ensure that we do not have a systemic risk of fuel tank explosions with our hardware or the QRH procedure that requires you to reset the circuit breaker to this system.

Original NASA ASRS Text

Title: A300 Captain reported receiving a maintenance report stating burn residue found at the terminal end of the probes inside the fuel tank. This was after the Captain had performed the QRH procedure for a fuel gauge inoperative/reset.

Narrative: At the top of the descent the ECAM Fuel Display for the right inner tank went to 'XX.X'. Fuel in this tank was approximately zero at this point. This lack of signal caused the fuel totalizer; CG; Gross Weight of the airplane to also go to XX.X. Per the QRH; there are two CB's (P60/P61) that we are advised to reset to restore the fuel quantity indication. That action only corrected the problem intermittently. We landed in ZZZ and Maintenance troubleshot and signed off on the fuel system as airworthy. The same problem recurred on the flight from ZZZ to ZZZ1. Again; we followed the QRH CB procedure; but still; it did not fix the problem. We landed and wrote up the AML. I received a maintenance report on [date] in ZZZ1 stating that they found burn residue at the terminal end of the probes inside that fuel tank. I would like to ensure that the right folks are aware of this incident to determine if we have a systemic issue here with the hardware (arcing in an empty fuel tank) or the QRH procedure when we are resetting power to the cadensicon probes. The gravity of the threat of a fuel tank explosion should be apparent to us all. Recommend that this issue be investigated to ensure that we do not have a systemic risk of fuel tank explosions with our hardware or the QRH procedure that requires you to reset the CB to this system.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1644205
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Fuel Quantity-Pressure Indication
Person 1
Function	Captain Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe

A300 captain reported receiving a maintenance report stating burn residue found at the terminal end of the probes inside the fuel tank. This was after the captain had performed the QRH procedure for a fuel gauge inoperative/reset.