A lot of people have reported that they cannot complete Red Hammer's "Grounded" mission since upgrading OFP past version 1.30. "Grounded" is the mission where you have to steal a fuel truck to refuel your MI-17 chopper, take off and pick up a squad and escape the island safely.
If you're running OFP: Resistance version 1.85 or higher, try installing the Red Hammer compatibility patch to see if that resolves the problem.
OFP player Random suggests that you try controlling the chopper even when the cut-scene is playing. Press and hold your keyboard's Q key to gain altitude and pull back on the mouse or joystick to lift the nose and slow down.
OFP player Snajper used this method to resolve the problem. Fly the MI-17, at an altitude of about 80 to 120 meters and at a speed above 150, straight in the direction of the repair waypoint. Just before flying over the waypoint's village perimeter, select AUTO-HOVER from the action menu and don't touch anything. The following cutscene should start playing within a few seconds. After the cutscene finishes, you should be flying around, happy as a bird and in one piece, for a change.
Some people just keep replaying the mission until it continues on to the next stage, which may happen even after the chopper crashes. I recommend that you save the mission during your approach to the repair area.
I personally have managed to pass the stage of the mission by slowing the chopper down to a crawl and coming in at an altitude of 150 meters or so on approach to the repair truck vicinity.
If these suggestions fails to help, you may need to resort to using the ENDMISSION cheat to skip "Grounded" altogether and move on to the next mission. However, some players report that the ENDMISSION cheat causes mission failure when used at certain points in the "Grounded" mission.
Please remember that Red Hammer is a Codemasters product. BIS had nothing to do with Red Hammer's development. Requests for correcting this mission to function reasonably with the latest updated versions of OFP should be addressed to Codemasters customer service.