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Flight crew of a MD90 descended in response to a TCASII RA and advised ATC. ARTCC controller then instructed reporter to turn to a given heading immediately.
| Attributes | |
| ACN | 469080 |
| Time | |
| Date | 200004 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : rzs.vortac |
| State Reference | CA |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 469080 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : separated traffic flight crew : took precautionary avoidance action none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While at cruise altitude FL240 north of rzs, TCASII alerted a TA followed by an RA advising a descent. TCASII display showed another TCASII equipped aircraft descending about 600 ft above our altitude. We immediately followed the RA and descended. I called ZLA to advise them of our action and RA. ZLA told us to turn to heading 270 degrees immediately. We turned to that heading as we descended. 'Clear of conflict' sounded. ZLA then cleared us direct bsr and resume cruise at FL240. We never saw the aircraft that gave us this RA. Our destination was sfo. No complaints of any injuries by passenger nor crew after completion of maneuver. Rest of flight was uneventful.
Original NASA ASRS Text
Title: FLC OF A MD90 DSNDED IN RESPONSE TO A TCASII RA AND ADVISED ATC. ARTCC CTLR THEN INSTRUCTED RPTR TO TURN TO A GIVEN HDG IMMEDIATELY.
Narrative: WHILE AT CRUISE ALT FL240 N OF RZS, TCASII ALERTED A TA FOLLOWED BY AN RA ADVISING A DSCNT. TCASII DISPLAY SHOWED ANOTHER TCASII EQUIPPED ACFT DSNDING ABOUT 600 FT ABOVE OUR ALT. WE IMMEDIATELY FOLLOWED THE RA AND DSNDED. I CALLED ZLA TO ADVISE THEM OF OUR ACTION AND RA. ZLA TOLD US TO TURN TO HDG 270 DEGS IMMEDIATELY. WE TURNED TO THAT HDG AS WE DSNDED. 'CLR OF CONFLICT' SOUNDED. ZLA THEN CLRED US DIRECT BSR AND RESUME CRUISE AT FL240. WE NEVER SAW THE ACFT THAT GAVE US THIS RA. OUR DEST WAS SFO. NO COMPLAINTS OF ANY INJURIES BY PAX NOR CREW AFTER COMPLETION OF MANEUVER. REST OF FLT WAS UNEVENTFUL.
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.