For whatever reason on my second try the triggers worked (?)
I can only confirm that the last instructions/directions after taking off from the hospital back to FARP Otkrytka (bearing 136, radionbeacon 960) are wrong: Instead of going south-east (where you will definitely cross the border to the south!) the way back to Orkrytka is north-west and correct radionbeacon is 940.
Really difficult often is the power / weight management: taking off can be really challenging... pulling too much collective makes the rudder ineffective resulting in an uncontrollable spin (at least for me 😉 )
All in all, for me the campaign is very interesting with very entertaining missions, but not overly complex and misisons are not too long. Thanks Armen!
jetsimace's post in Mission 2 (radar) issue was marked as the answer