I am not an aviation guy but, in looking at this rate it appears that when you get shore duty, it looks as if you do the same things but just at an Air Station instead of a carrier. Which in an ABH's case would be spotting and securing aircraft, as well as crash rescue and fire fighting. It look as if there is also a few NECs for ABH. Overall it is a Sea intensive rate with a 60/36 month flow.
Here is a link to a great site that has more info about this rate and others.
http://usmilitary.about.com/od/enlistedjob1/a/abh.htm