Safety Issue
The processes used by some turboprop operators for checking the
fuel quantity on board prior to flight have not used two methods of
sufficient independence. In particular, the practice of using a
comparison of a gauge indication after refuelling with the gauge
indication prior to refuelling plus the fuel added is not adequate
to detect gradually developing errors in gauge indications.
Safety Advisory Notice
The Australian Transport Safety Bureau advises that all turbo
prop operators should consider the implications of this Safety
Issue and take action where considered appropriate.