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TRACON approach controller issue DH8 crossing BE58 traffic. DH8 reports traffic in sight, then subsequently reacts to TCASII RA, descending. Controller perceives this activity as 'nuisance.'
| Attributes | |
| ACN | 421108 |
| Time | |
| Date | 199811 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mad |
| State Reference | CT |
| Altitude | msl bound lower : 4400 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Flight Phase | cruise other |
| Route In Use | departure other departure sid : sid enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Experience | controller radar : 8 flight time total : 450 |
| ASRS Report | 421108 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
DH8 radar vector heading 180 degrees intercept mad 182 degree radial, level 5000 ft. Issued traffic ('1 O'clock position, 3 mi, eastbound, crossing overhead at 5500 ft indicated'). DH8 advise traffic in sight. Told DH8 to contact approach on 132.25. Approximately 20 seconds later, conflict alert sounded. DH8 (still on my frequency) announced that he had an RA and descended to 4400 ft. This was a nuisance TCASII maneuver -- totally unnecessary. This could have been ugly if I had traffic northbound at 4000 ft (which is the STAR for that area).
Original NASA ASRS Text
Title: TRACON APCH CTLR ISSUE DH8 XING BE58 TFC. DH8 RPTS TFC IN SIGHT, THEN SUBSEQUENTLY REACTS TO TCASII RA, DSNDING. CTLR PERCEIVES THIS ACTIVITY AS 'NUISANCE.'
Narrative: DH8 RADAR VECTOR HDG 180 DEGS INTERCEPT MAD 182 DEG RADIAL, LEVEL 5000 FT. ISSUED TFC ('1 O'CLOCK POS, 3 MI, EBOUND, XING OVERHEAD AT 5500 FT INDICATED'). DH8 ADVISE TFC IN SIGHT. TOLD DH8 TO CONTACT APCH ON 132.25. APPROX 20 SECONDS LATER, CONFLICT ALERT SOUNDED. DH8 (STILL ON MY FREQ) ANNOUNCED THAT HE HAD AN RA AND DSNDED TO 4400 FT. THIS WAS A NUISANCE TCASII MANEUVER -- TOTALLY UNNECESSARY. THIS COULD HAVE BEEN UGLY IF I HAD TFC NBOUND AT 4000 FT (WHICH IS THE STAR FOR THAT AREA).
Data retrieved from NASA's ASRS site as of July 2007 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.