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Cleared for descent when TCASII RA issued. Delay descent.
| Attributes | |
| ACN | 260109 |
| Time | |
| Date | 199312 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw tower : rdu |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9000 flight time type : 1000 |
| ASRS Report | 260109 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While on a right downwind at 11000 ft MSL, in level flight, at approximately 210 KIAS, we received a TCASII RA which verbally instructed us to 'climb, climb' etc, and the ivsi guidance lights instructed us to initiate a climb at approximately 300 plus FPM or better. We were in clear daylight visual conditions and I could see the aircraft causing the RA. The alert aircraft was climbing at a high rate (medium large transport) to their initial climb altitude of 10000 ft, which is standard for all dfw area turbojet departures. These types of sits still occur fairly frequently at dfw. In our case, I informed ATC we had an RA and the captain (PF) delayed our previously issued descent for approximately 30 seconds or so (just prior to the RA we had been cleared down to 6000 ft MSL). After the RA, I then spotted the aircraft visually with reference to the TCASII display and informed ATC. The controller was quite busy and sounded somewhat 'anxious' about the delay in initiating our descent, possibly due to other (unknown to us) projected conflicting aircraft or due to 'short final' or 'slam dunk' operations in progress. It is unknown to us, but another possibly greater conflict could have occurred if we had rapidly 'pulled-up' and initiated a climb in this very busy airspace.
Original NASA ASRS Text
Title: CLRED FOR DSCNT WHEN TCASII RA ISSUED. DELAY DSCNT.
Narrative: WHILE ON A R DOWNWIND AT 11000 FT MSL, IN LEVEL FLT, AT APPROX 210 KIAS, WE RECEIVED A TCASII RA WHICH VERBALLY INSTRUCTED US TO 'CLB, CLB' ETC, AND THE IVSI GUIDANCE LIGHTS INSTRUCTED US TO INITIATE A CLB AT APPROX 300 PLUS FPM OR BETTER. WE WERE IN CLR DAYLIGHT VISUAL CONDITIONS AND I COULD SEE THE ACFT CAUSING THE RA. THE ALERT ACFT WAS CLBING AT A HIGH RATE (MLG) TO THEIR INITIAL CLB ALT OF 10000 FT, WHICH IS STANDARD FOR ALL DFW AREA TURBOJET DEPS. THESE TYPES OF SITS STILL OCCUR FAIRLY FREQUENTLY AT DFW. IN OUR CASE, I INFORMED ATC WE HAD AN RA AND THE CAPT (PF) DELAYED OUR PREVIOUSLY ISSUED DSCNT FOR APPROX 30 SECONDS OR SO (JUST PRIOR TO THE RA WE HAD BEEN CLRED DOWN TO 6000 FT MSL). AFTER THE RA, I THEN SPOTTED THE ACFT VISUALLY WITH REF TO THE TCASII DISPLAY AND INFORMED ATC. THE CTLR WAS QUITE BUSY AND SOUNDED SOMEWHAT 'ANXIOUS' ABOUT THE DELAY IN INITIATING OUR DSCNT, POSSIBLY DUE TO OTHER (UNKNOWN TO US) PROJECTED CONFLICTING ACFT OR DUE TO 'SHORT FINAL' OR 'SLAM DUNK' OPS IN PROGRESS. IT IS UNKNOWN TO US, BUT ANOTHER POSSIBLY GREATER CONFLICT COULD HAVE OCCURRED IF WE HAD RAPIDLY 'PULLED-UP' AND INITIATED A CLB IN THIS VERY BUSY AIRSPACE.
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.