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Sna controller elected not to issue a go-around response to a twin cessna that had already landed when an asde-x alarm was received believed to be from a helicopter on upwind leg.
| Attributes | |
| ACN | 871030 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SNA.Tower |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | Robinson R22 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Route In Use | None |
| Flight Plan | VFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Helicopter was working closed pattern on runway 19L and was cleared for the option. Twin cessna sequenced number two following the helicopter and cleared to land. The asde-X alarmed when the twin cessna was touching down at the approach end of runway 19L. The helicopter was upwind past the departure end of runway 19L. I did not send the twin cessna around because he was already on the runway when the alarm went off. In my judgment it would not have been safe to send the twin cessna around since he had already landed and the runway is only 2850 ft and there was no loss of separation. I would classify this as a nuisance alert. Recommendation; have the option to make judgment calls on situations like this. There are pros and cons to asde-X. We have just started using it and this is the first time I have felt that if I would have sent the aircraft around it could of caused a very serious accident. I was aware of all the traffic and made a decision that I believe was the best.
Original NASA ASRS Text
Title: SNA Controller elected not to issue a go-around response to a twin Cessna that had already landed when an ASDE-x alarm was received believed to be from a helicopter on upwind leg.
Narrative: Helicopter was working closed pattern on Runway 19L and was cleared for the option. Twin Cessna sequenced number two following the helicopter and cleared to land. The ASDE-X alarmed when the twin Cessna was touching down at the approach end of Runway 19L. The helicopter was upwind past the departure end of Runway 19L. I did not send the twin Cessna around because he was already on the runway when the alarm went off. In my judgment it would not have been safe to send the twin Cessna around since he had already landed and the runway is only 2850 FT and there was no loss of separation. I would classify this as a nuisance alert. Recommendation; have the option to make judgment calls on situations like this. There are pros and cons to ASDE-X. We have just started using it and this is the first time I have felt that if I would have sent the aircraft around it could of caused a very serious accident. I was aware of all the traffic and made a decision that I believe was the best.
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.