Ind approach controller providing OJT from an adjacent radar display described a loss of separation ...

Narrative:

A C172 was on frequency north; northwest bound and 6;000 ft. I was completely unaware of aircraft X. I was conducting OJT at an adjacent scope. My practice was to turn a data block blue when the aircraft checked on the frequency. When the developmental reacted to the pending loss of separation I was stunned to see 2 targets in the vicinity. I thought I had been scanning well as there were a lot of overflights; satellite arrivals and IFR departures. After the developmental began to take action I learned that aircraft X was on the frequency and landing at an airport in a sector next to our airspace boundary. Had I known of this traffic I would have suggested the developmental issue a descent to aircraft X to resolve the conflict. I did not see the developmental take the hand off on aircraft X; and I do not remember him checking on the frequency. When conducting OJT at an adjacent scope I would like to see the same visual presentation on the stars as the developmental; same colors and hand off functions.

Original NASA ASRS Text

Title: IND Approach Controller providing OJT from an adjacent RADAR display described a loss of separation event when he realized the developmental had taken a hand off that eventually conflicted with another IFR aircraft.

Narrative: A C172 was on frequency north; northwest bound and 6;000 FT. I was completely unaware of Aircraft X. I was conducting OJT at an adjacent scope. My practice was to turn a data block blue when the aircraft checked on the frequency. When the Developmental reacted to the pending loss of separation I was stunned to see 2 targets in the vicinity. I thought I had been scanning well as there were a lot of overflights; satellite arrivals and IFR departures. After the Developmental began to take action I learned that Aircraft X was on the frequency and landing at an airport in a sector next to our airspace boundary. Had I known of this traffic I would have suggested the Developmental issue a descent to Aircraft X to resolve the conflict. I did not see the Developmental take the hand off on Aircraft X; and I do not remember him checking on the frequency. When conducting OJT at an adjacent scope I would like to see the same visual presentation on the STARS as the Developmental; same colors and hand off functions.

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	901161
Time
Date	201007
Local Time Of Day	1201-1800
Place
Locale Reference	IND.Airport
State Reference	IN
Aircraft 1
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Flight Phase	Cruise
Route In Use	None
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Ind approach controller providing OJT from an adjacent radar display described a loss of separation event when he realized the developmental had taken a hand off that eventually conflicted with another IFR aircraft.