Well, the animation part is not the problem. You can create those animations in helicoper models, too. But although Kegetys defenitely is the better addon editor than me I disagree with him that the gear event also works for choppers.
The property in the config file that makes aircraft gear retractable is
GearRetracting=1;This line has no effects on helicopters. Hence you will never have "Gear up" in your action menu which leads to the fact that you'll never have the
gear event for choppers. If Kegetys can make the
gear event for choppers work, I'll be the first one to congratulate him. But I wasn't able to do so.
The other way I could think of is to add the gear up/down option to the pilot via the
getIn event and remove it via the
getOut event or (even better as you wouldn't have to provide scripts with your addon) add a custom action to a selection in the chopper. This, however, can't be done due to a bug in OFP. I've already sent a bug report in the
official forums. but nobody seems to take notice of that. Maybe someone who has a better connection to BIS can make them aware of that. Without the bug, my answer would be: Retracting gear for choppers? No problem!
So, retracting gear for choppers is only a bugfix away.