As you can see in this video, after the helicopter reaches the mountains the engine blows up and the vehicle can be commanded, the issue here is that the vehicle is running by itself the only thing it's controllable it's the right and left directions and by this there is no way to land the helicopter to complete quest since I can't lower down the vehicle.
https://www.wowhead.com/wotlk/quest=12671/reconnaissance-flight#videos:id=972
As you can see in this video, after the helicopter reaches the mountains the engine blows up and the vehicle can be commanded, the issue here is that the vehicle is running by itself the only thing it's controllable it's the right and left directions and by this there is no way to land the helicopter to complete quest since I can't lower down the vehicle.