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While in cruise reporter's aircraft received RA to descend from TCASII. Just as descent began, ARTCC called the traffic.
| Attributes | |
| ACN | 431237 |
| Time | |
| Date | 199903 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : fak.vortac |
| State Reference | VA |
| Altitude | msl bound lower : 26500 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j109.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument pilot : multi engine pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 5150 flight time type : 1200 |
| ASRS Report | 431237 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were cruising at FL270 when we heard the TCASII issue a TA. We looked at the TCASII display, noticed the traffic at 2 O'clock and 400 ft above. Within seconds, the TCASII issued a 'descend' RA. The captain was flying. He promptly clicked off the autoplt and started to descend. Just as we started to descend, ZDC called the traffic. We told the controller that we were responding to a TCASII RA. We descended to FL265 and the TCASII then said 'monitor vertical speed.' shortly after this, the TCASII said 'clear of conflict.' we returned to FL270 and continued the flight safely. The controller gave us no further information on the other aircraft. There was a miscom somewhere allowing our aircraft and the unknown aircraft to get so close together. We were advised of the other traffic after beginning our descent. We never had visual contact on the other aircraft.
Original NASA ASRS Text
Title: WHILE IN CRUISE RPTR'S ACFT RECEIVED RA TO DSND FROM TCASII. JUST AS DSCNT BEGAN, ARTCC CALLED THE TFC.
Narrative: WE WERE CRUISING AT FL270 WHEN WE HEARD THE TCASII ISSUE A TA. WE LOOKED AT THE TCASII DISPLAY, NOTICED THE TFC AT 2 O'CLOCK AND 400 FT ABOVE. WITHIN SECONDS, THE TCASII ISSUED A 'DSND' RA. THE CAPT WAS FLYING. HE PROMPTLY CLICKED OFF THE AUTOPLT AND STARTED TO DSND. JUST AS WE STARTED TO DSND, ZDC CALLED THE TFC. WE TOLD THE CTLR THAT WE WERE RESPONDING TO A TCASII RA. WE DSNDED TO FL265 AND THE TCASII THEN SAID 'MONITOR VERT SPD.' SHORTLY AFTER THIS, THE TCASII SAID 'CLR OF CONFLICT.' WE RETURNED TO FL270 AND CONTINUED THE FLT SAFELY. THE CTLR GAVE US NO FURTHER INFO ON THE OTHER ACFT. THERE WAS A MISCOM SOMEWHERE ALLOWING OUR ACFT AND THE UNKNOWN ACFT TO GET SO CLOSE TOGETHER. WE WERE ADVISED OF THE OTHER TFC AFTER BEGINNING OUR DSCNT. WE NEVER HAD VISUAL CONTACT ON THE OTHER ACFT.
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.