use tables to convert the apparent readings of the fuel tank dripsticks to real fuel levels. The sole manufacturer of this device is Thales Optronics Taunton Limited in the UK, and it is in use on Airbus single-aisle (A318/319/320/321) and long-range (A330/340) aircraft as well as on the Concorde and on Fokker and BAe 146 aircraft. The typical part number is DR3174 or DR31740000GA.

Issue 7, which is the current version of the Attitude Monitor, is built to – and repaired to – specs that require a nitrogen gas chamber for filling it with fluorescein and for inserting the gas bubble. That can only be done at the Thales facility in the UK or at Erie Aviation, which offers new units and a full warranty and repair service. All repair batches have a sample unit used for destructive testing with UV rays to ensure the longest possible life.

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The attitude monitor sits in one of the wheel wells. It looks like an advanced carpenter’s level, with a large sight glass divided into a grid of squares. It is filled with fluorescein liquid that’s a bright yellow, and there is a nitrogen gas bubble floating around in it. The fueling crew determines where in the grid the bubble is located and can then