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An IFR arrival into mvy reported an apparent traffic conflict observed on TCAS and issued by ATC; the ATC report indicated that the conflicting target was likely a 'false target' sometimes experieced with the radar system.
| Attributes | |
| ACN | 1108120 |
| Time | |
| Date | 201308 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | MVY.Airport |
| State Reference | MA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Gulfstream IV / G350 / G450 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Approach Departure |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
On approach and heading vectors at 5;000 ft nearing mvy approach pointed out traffic at our assigned altitude at 12 o'clock. There was no contact visually or TCAS indication. Approach was partially blocked as it sounded as if he was giving an immediate 45 degree turn. We quickly jumped in to have him repeat for our aircraft and he again stated turn immediate to hug 180 degrees. I was ready with TCAS switch to override automation if need be and clicked off automation with a positive turn. In the turn; plane dropped less than 200 ft to 4;850 ft and I quickly corrected. Nothing from ATC was mentioned and we shortly given another heading once clear toward the airport. [Flight was] uneventful from there on.
Original NASA ASRS Text
Title: An IFR arrival into MVY reported an apparent traffic conflict observed on TCAS and issued by ATC; the ATC report indicated that the conflicting target was likely a 'false target' sometimes experieced with the RADAR system.
Narrative: On approach and heading vectors at 5;000 FT nearing MVY Approach pointed out traffic at our assigned altitude at 12 o'clock. There was no contact visually or TCAS indication. Approach was partially blocked as it sounded as if he was giving an immediate 45 degree turn. We quickly jumped in to have him repeat for our aircraft and he again stated turn immediate to hug 180 degrees. I was ready with TCAS switch to override automation if need be and clicked off automation with a positive turn. In the turn; plane dropped less than 200 FT to 4;850 FT and I quickly corrected. Nothing from ATC was mentioned and we shortly given another heading once clear toward the airport. [Flight was] uneventful from there on.
Data retrieved from NASA's ASRS site as of July 2013 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.