Here's a better picture showing all probes, and labeled:
Link to original, high-resolution, unnumbered picture
- Ice detector
- Multi-function probe 1
- Static port
- TAT probe
- Side-slip vane
- Pitot probe
- Angle-of-attack vane
Airbus.com has a PDF (pdf page 125) about the various probes.
As the name suggests, the multi-function probes record different types of data. Here are more details:
The piloting of any aircraft involves knowing the relative speed of
the aircraft with respect to the airflow surrounding it, that is to
say to the relative wind. This speed is determined with the aid of
sensors of the static pressure Ps, of the total pressure Pt and of the
angle of incidence “alpha”. “Alpha” provides the direction of the
speed vector in a reference system tied to the aircraft and Pt-Ps
provides the modulus of this vector. The three aerodynamic parameters
therefore make it is possible to determine the speed vector of an
These are covered by a US Patent.
Someone asked a similar question here.