For the radio, you have to use the comm1 (only one working) but with the preset list 2.
And as said, for the Harrier you need to use a KC130, Il78 or S3 to refuel. The KC135 is for A10C and F15 (client flying planes).
Can someone explain me the difference between the OUT and PRESS positions ?
Nothing in the pocketguide. In the GR7-GR9 manual from the FSX version Razbam made I found :
Does it mean that in PRESS only the internal tanks are refueled and not the wings ?