In every French aiport, radio-equipements used by aircraft for instrumental approaches needs to be checked every year (and even more often in some cases).

One of the steps in the process is called in-flight calibration and is done by an ATR42 which is full of sensors (the kind of airplane where you should not use your phone ! 😛 ).

Here are some pictures in Cannes Mandelieu LFMD :


More information :

Localizer on Wikipedia

Flight Inspection Wikipedia (should be completed)


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