Citation Excel (C560XL)
Air Traffic Control Fully Certified
Other / Unknown
Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude
General None Reported / Taken
Airspace Structure; Procedure; Aircraft
A C560 was vectored northbound over PHX at [5000 ft] enroute to SDL. The COL4 was southbound at [4500 ft] on the East Transition over PHX. These are altitudes on routes per our SOP. Both aircraft were level. Traffic was called for both aircraft and they were told the other was level. The C560 passed over the COL4 and responded to an RA. He climbed 200 FT; saw the other aircraft; and then descended back to his assigned altitude. Separation and safety was maintained on routes and altitudes per the P50 SOP. The only way to avoid this completely would have been to climb the C560 to [6000 ft]; which would have been a 1;000 FT climb within 10-15 miles from his destination and it would require coordination. If another aircraft was at that altitude it wouldn't have been an option. There wasn't anything else I could have done to help.
P50 Controller described a TCAS RA event resulting from a minimally separated IFR overflight and a VFR transition aircraft; the reporter noting all SOP procedures were followed.