Controller reports that pilot responded to traffic that he did not see until the pilot reported it. ...

Attributes
ACN	1160384
Time
Date	201403
Local Time Of Day	1201-1800
Place
Locale Reference	ZKC.ARTCC
State Reference	KS
Environment
Light	Daylight
Aircraft 1
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Flight Phase	Cruise
Flight Plan	VFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Vertical 100

Narrative:

Aircraft X reported that he has missed a small experimental aircraft by 100 ft. I never saw the aircraft on radar until after the report and the pilot did not see the aircraft on TCAS till the last minute but was able to avoid the aircraft. The aircraft had no mode C and conflict alert never went off. Conflict alert on eram does not seem as affective as conflict alert on host. VFR aircraft without an altitude readout should be subject to conflict alert.

Original NASA ASRS Text

Title: Controller reports that pilot responded to traffic that he did not see until the pilot reported it. Pilot did not see traffic until TCAS alerted him at the last minute. Controller suggests ERAM vs. Host problem.

Narrative: Aircraft X reported that he has missed a small experimental aircraft by 100 FT. I never saw the Aircraft on radar until after the report and the pilot did not see the Aircraft on TCAS till the last minute but was able to avoid the aircraft. The aircraft had no mode C and Conflict alert never went off. Conflict alert on ERAM does not seem as affective as Conflict Alert on HOST. VFR aircraft without an ALT readout should be subject to conflict alert.

Data retrieved from NASA's ASRS site 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.

Controller reports that pilot responded to traffic that he did not see until the pilot reported it. Pilot did not see traffic until TCAS alerted him at the last minute. Controller suggests eram vs. Host problem.