What happens if you call arty with recon plane's spotter position:
The voice is played, but there is no "target recived by..." message and the coordinates are not being sent to the arty system (simply nothing happens).
The voice is played, but there is no "target recived by..." message. Surprisingly, the coordinates are being sent to the arty system (so simply it works, but there's no HUD information as for binoscs).
The other thing I noticed (and which could be already reported) is that fi 156 is completely uncontrolable while on the ground at low speeds (so simply you can't taxi it).