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ZSE controller reported momentary loss of tracking for two aircraft arriving rdm. Both aircraft were in a turn on a visual approach; but the ATC system appeared to be receiving good transponder returns.
| Attributes | |
| ACN | 981072 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RDM.Airport |
| State Reference | OR |
| Aircraft 1 | |
| Make Model Name | PA-31 Navajo/Chieftan/Mojave/T1040 |
| Flight Phase | Descent |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types |
Narrative:
[Two] aircraft arrived krdm from the northwest on the visual approach and made approximately 180 degree turns to final close into the airport. When they made the turns the data block went into coast mode even though I was still showing a good radar target during the turn. Appears to be some type of tracking issue where eram cannot track even though a valid transponder return is being received. I don't recall if the first aircraft had a 3 NM separation symbol (ball and I believe it was a beacon slash only). However; the second aircraft had a 3 mile golf ball symbol during the turn along with a good target return; yet still went into coast mode for about 3-4 hits. After landing; it tracked back up. Adjust eram to provide tracking through out a turn when good/valid radar data is still being received.
Original NASA ASRS Text
Title: ZSE Controller reported momentary loss of tracking for two aircraft arriving RDM. Both aircraft were in a turn on a visual approach; but the ATC system appeared to be receiving good transponder returns.
Narrative: [Two] aircraft arrived KRDM from the northwest on the visual approach and made approximately 180 degree turns to final close into the airport. When they made the turns the data block went into coast mode even though I was still showing a good radar target during the turn. Appears to be some type of tracking issue where ERAM cannot track even though a valid transponder return is being received. I don't recall if the first aircraft had a 3 NM separation symbol (ball and I believe it was a beacon slash only). However; the second aircraft had a 3 mile golf ball symbol during the turn along with a good target return; yet still went into coast mode for about 3-4 hits. After landing; it tracked back up. Adjust ERAM to provide tracking through out a turn when good/valid radar data is still being received.
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.