Narrative:

Aircraft X was at dropping altitude of 14500 feet heading west into a flow I had. Aircraft Y was out of 11000 feet descending on the arrival. Aircraft X continued to drop west of his jump zone up until 3 miles from aircraft Y. [Aircraft X] turned into the aircraft Y and dropped rapidly without warning. Aircraft X has to tell us when they descend for this exact reason. I asked aircraft X if he was descending. I received no response. I called traffic to aircraft Y. I returned to aircraft X to advise him of the traffic. I issued aircraft X traffic and to turn southeast immediately. Aircraft X then 'sighed' on frequency and turned northeast. Other than the sigh no response from aircraft X.he came off the ground sometime after that and I told him that he has to say when he is descending because he descended into my heavy B767. Aircraft X said that he had turned to a 060 heading and was southeast-bound turn going to help. I said I told you immediately and all you did was sigh. He then asked how long have I been a controller and that he flies 6 days a week and it is only on [this day of the week] that this happens. He asked for my initials. A controller got me out; and told me that on the descent aircraft X used profane language on frequency.the airport called and said it was radio issue with aircraft X; but then how did I hear the sigh? They then told the controller in charge (controller in charge) that he was having a rough time; and that the case is closed. The controller in charge said no; we are going to look into it some more. Aircraft X has used these radio tricks before just so they can get close heavy jets on purpose; it is unsafe.

Related reports:

Google
 

Original NASA ASRS Text

Title: Center Controller reported a parachute jump aircraft descended into a confliction with an air carrier and appeared to ignore the Controller's instructions.

Narrative: Aircraft X was at dropping altitude of 14500 feet heading west into a flow I had. Aircraft Y was out of 11000 feet descending on the arrival. Aircraft X continued to drop west of his jump zone up until 3 miles from Aircraft Y. [Aircraft X] turned into the Aircraft Y and dropped rapidly without warning. Aircraft X has to tell us when they descend for this exact reason. I asked Aircraft X if he was descending. I received no response. I called traffic to Aircraft Y. I returned to Aircraft X to advise him of the traffic. I issued Aircraft X traffic and to turn southeast IMMEDIATELY. Aircraft X then 'sighed' on frequency and turned northeast. Other than the sigh no response from Aircraft X.He came off the ground sometime after that and I told him that he has to say when he is descending because he descended into my heavy B767. Aircraft X said that he had turned to a 060 heading and was southeast-bound turn going to help. I said I told you immediately and all you did was sigh. He then asked how long have I been a controller and that he flies 6 days a week and it is only on [this day of the week] that this happens. He asked for my initials. A controller got me out; and told me that on the descent Aircraft X used profane language on frequency.The airport called and said it was radio issue with Aircraft X; but then how did I hear the sigh? They then told the Controller in Charge (CIC) that he was having a rough time; and that the case is closed. The CIC said no; we are going to look into it some more. Aircraft X has used these radio tricks before just so they can get close heavy jets on purpose; it is unsafe.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.