P50 controller described a TCAS RA event resulting from a minimally separated IFR overflight and a V...

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	989663
Time
Date	201201
Local Time Of Day	1201-1800
Place
Locale Reference	P50.TRACON
State Reference	AZ
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna 400
Flight Phase	Cruise
Flight Plan	VFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude

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.