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Wrong fuel quantity indicator possible cause of Tuninter ATR-72 accident
7 September 2005

The Italian accident invesigation board ANSV reported that the ill-fated ATR-72 that crashed off Sicily in August had the Fuel Quantity Indicator (FQI) of an ATR-42 installed on the flightdeck. The normal operation of the FQI is to processes the signal coming from the capacitance probes installed in the tanks with an algorithm typical for each aircraft, depending on tank shape, size and number of probes installed. The indications of the amount of fuel on board the airplane were thuse unreliable. The ANSV recommended that the European Aviation Safety Agency, should require an ATR-72 and ATR-42 fleet inspection in order to verify the installation of the applicable Fuel Quantity Indicator, and should consider the possibility to mandate a modification of the Fuel Quantity Indicator installation in order to prevent any incorrect fitting. (ANSV)