Gulfstream G100/G150 (IAI 1125 Astra)
Air Traffic Control Developmental
Communication Breakdown; Situational Awareness
Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors; Procedure
I received a message from Aircraft Y relaying a message from Aircraft X stating that the aircraft had departed PTPN VFR; was leaving FL230 climbing to FL400; and was requesting an IFR clearance to RPMD. I replied to Aircraft Y to relay to Aircraft X the HF frequencies and to contact [Commercial Radio] for IFR clearance and provide present position latitude/longitude and altitude. I told aircraft to maintain VFR. I contacted [Commercial Radio] and asked if they had communication with Aircraft X. They advised they could hear the pilot but he couldn't hear them. I then received another message from Aircraft Y relaying Aircraft X position report; level at FL400; and still requesting IFR clearance. I used a brasher warning to Aircraft X; relayed through Aircraft Y. Aircraft X called the Supervisor on the landline and I was able to issue IFR clearance at that time. At the time I received the message that Aircraft X was leaving FL230 climbing to FL400; the aircraft was in conflict with Aircraft Y at FL370. Aircraft X climbed to FL400 without an IFR clearance and caused possible loss of separation with Aircraft Y. A course of action I could/should have taken was to advise both aircraft of the situation and attempted to stop Aircraft X climb by issuing a lower altitude. I advised the aircraft to maintain VFR in hopes the aircraft would descend and remain below FL200; which is VFR airspace as prescribed in the PAC Chart Supplement.
Oakland Oceanic Controller reported a loss of separation between two aircraft.