In order to perform this task, it provides technical crew (captains and copilots). Up to 16 are qualified on both the aircraft type and this type of operation. Training for calibration ( which in the regulation is called a specific activity) consists in a theoretical course and a 20-sector line training; this training can last several weeks.
 

The STNA engineers operate the measurement benches and are responsible for the progress of the flight inspection mission.
This very specific type of operation is an example of real teamwork :

Trajectories to be followed are specific and must be especially rigorous. A glide axis measure (glide slope), for instance, typically finishes 15 m above ground level. Moreover, flying is entirely manual for the automatic pilot has too much inertia to follow the D/GPS trajectography,

The flight inspection flights are performed in very different conditions (weather, different airports, and heavy traffic). The feasibility of the task is first studied by the crew then a briefing with the local control specifies the details as calibration flights never have priority over commercial traffic.

In flight inspection has three specially adapted aircraft :

One ATR 42 and one Beechcraft B200 equipped with calibration benches. Although interchangeable, each one has its own advantages.
The ATR has very good payload and range (which allow an annual inspection at St Pierre et Miquelon for example)

The B200 has a larger flight envelope and is more cost effective

The Beechcraft 90 is specialised in radio garbling identification.