Use the mouse or arrow-keys to control the helicopter.
Click the left mouse button or press [X] to release cargo.
Use Shift to activate free camera view.
[W], [S], and [X] raise, lower, and unlink the both ropes.
[Q], [A], and [Z] raise, lower, and unlink the left rope.
[E], [D], and [C] raise, lower, and unlink the right rope.
Use the spacebar to equalize rope lengths.