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The pilot was forced to land on a road when the useable fuel on board the aircraft had been consumed. The aircraft fuel quantity had been verified with an incorrect fuel dipstick that indicated unusable fuel as being useable fuel. The aircraft fuel gauges were capable of indicating fuel quantities that were consistent with the last fuel calibration card in the cockpit.

The incorrect markings on the dipstick accounted for a fuel discrepancy of 23 litres. The investigation could not determine the source of the remaining 20 litre fuel discrepancy.

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