French investigators have disclosed that an Air France Airbus A319 was forced to make a single-engine landing at Paris Charles de Gaulle after an undetected indicator fault resulted in partial fuel exhaustion. Investigation authority BEA – which analysed the March 2014 event – says pilots operating a series of Marseille-Nantes services performed a routine discrepancy check on the theoretical and actual fuel usage, and found the difference to be just 20kg. But BEA says the aircraft had been experiencing intermittent failure of its fuel quantity indicator, and the actual difference was 880kg. Analysis of refuelling documents and technical log entries for the aircraft revealed several calculation errors by crews – sometimes as much as 1t. This could explain why the indicator failure was not previously identified and resolved. <br/>