A line holder CAN fly on a PD day, WS,GS, whatever.

However a reserve CANNOT fly on a PD day...yes, a personal drop...can't fly on a APD for either line or reserve.

Edit: once a reserve personal drops a day, ya can't go back and try to pickup anything that day. No takebacks...even if there's later a sweet trip with 30 hrs in your hometown. Went out as a greenie to someone later, so at least there's that.