Sct controller with minimal experience; influenced by a veteran; turned an air carrier inside a cess...

Narrative:

I was the relieving controller. A C152 was on a 9 mile ILS final had been cleared for the approach. The relieved controller; during the two minute overlap; contacted sna tower for an early turn for air carrier X who was downwind abeam the airfield. It was not my intention to turn air carrier X inside of the cessna. However; I let the controller lead me into it. My plan was to extend air carrier X downwind and I already had him slowed. Air carrier X turned about a five mile base descending through three thousand feet. The cessna was at 7 miles; I canceled his clearance and told him to maintain 3000. I turned the cessna to a 270 heading; I should have used a 90 heading instead but I was concerned with the MVA. I gave traffic to cessna; did not have time to give traffic to air carrier X. Cessna reported air carrier X in sight. I told cessna to maintain visual separation. I am not sure but I think separation was lost prior to having visual separation. I do not think the MSAW went off either. Recommendation; do not let other controllers lead you into something you would not normally do especially if you cannot ensure separation. I think my plan would have been more efficient; air carrier X would have had maybe an extra ten miles to fly but it would have been safer for all concerned. As a new cpa we sometimes look up to the veteran controllers and heed their plans instead of your own.

Original NASA ASRS Text

Title: SCT controller with minimal experience; influenced by a veteran; turned an air carrier inside a Cessna on approach to SNA that resulted in a loss of separation.

Narrative: I was the relieving controller. A C152 was on a 9 mile ILS final had been cleared for the approach. The relieved controller; during the two minute overlap; contacted SNA Tower for an early turn for Air Carrier X who was downwind abeam the airfield. It was not my intention to turn Air Carrier X inside of the Cessna. However; I let the controller lead me into it. My plan was to extend Air Carrier X downwind and I already had him slowed. Air Carrier X turned about a five mile base descending through three thousand feet. The Cessna was at 7 miles; I canceled his clearance and told him to maintain 3000. I turned the Cessna to a 270 heading; I should have used a 90 heading instead but I was concerned with the MVA. I gave traffic to Cessna; did not have time to give traffic to Air Carrier X. Cessna reported Air Carrier X in sight. I told Cessna to maintain visual separation. I am not sure but I think separation was lost prior to having visual separation. I do not think the MSAW went off either. Recommendation; do not let other controllers lead you into something you would not normally do especially if you cannot ensure separation. I think my plan would have been more efficient; Air Carrier X would have had maybe an extra ten miles to fly but it would have been safer for all concerned. As a new CPA we sometimes look up to the veteran controllers and heed their plans instead of your own.

Data retrieved from NASA's ASRS site as of April 2012 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	879209
Time
Date	201003
Local Time Of Day	1801-2400
Place
Locale Reference	SCT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Sct controller with minimal experience; influenced by a veteran; turned an air carrier inside a cessna on approach to sna that resulted in a loss of separation.