In practice it's where you put your very broken toys. It's not a real designator in that sense, and it's not something you can come into the Navy to do.Generally speaking, what jobs are available in the Navy that a 1300 GENAV (General Aviation) could fulfill. I've asked a some folk in my squadron and they only know it's not preferred; however, no one has been able to give me explicit examples of these 'undesirable' jobs.
Get a FLTMPS account and look for 1300, 1302, 1000, etc. billets with your rank (I think LT is J or K.
There are a number of random jobs in DC where they need an officer to make PowerPoints and coffee and answer the phone. But as said above - find a new designator. Lateral transfer/redesignation board page on the new and not-so-improve mynavyhr site.
There's plenty more to the story...but you got the general gist.... uhh, wow, is there more to that story?