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Flight crew of an large transport started to descend in response to a TCASII RA when ATC issued descent instructions which cleared the TCASII target within 300 ft and 4 pt 5 mi.
| Attributes | |
| ACN | 333550 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : scy airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 333550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 27000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Level at 11000 ft MSL, heading 295 degrees, 210 KIAS, on scy 280/20. At about XA50Z we received an RA descend. The red traffic target was approximately 11 O'clock at 4 1/2 mi level at 11000 ft MSL. We did not get a TA. We started a descent to the green arc. Approach control was talking to another aircraft at the time. At the end of that transmission, approach gave us a descent to 5000 ft MSL and a heading 280 degrees. With my response, I said we had started a descent due to an RA. The traffic target disappeared when we were approximately 300 ft below it. We did not see any aircraft corresponding to the RA.
Original NASA ASRS Text
Title: FLC OF AN LGT STARTED TO DSND IN RESPONSE TO A TCASII RA WHEN ATC ISSUED DSCNT INSTRUCTIONS WHICH CLRED THE TCASII TARGET WITHIN 300 FT AND 4 PT 5 MI.
Narrative: LEVEL AT 11000 FT MSL, HDG 295 DEGS, 210 KIAS, ON SCY 280/20. AT ABOUT XA50Z WE RECEIVED AN RA DSND. THE RED TFC TARGET WAS APPROX 11 O'CLOCK AT 4 1/2 MI LEVEL AT 11000 FT MSL. WE DID NOT GET A TA. WE STARTED A DSCNT TO THE GREEN ARC. APCH CTL WAS TALKING TO ANOTHER ACFT AT THE TIME. AT THE END OF THAT XMISSION, APCH GAVE US A DSCNT TO 5000 FT MSL AND A HDG 280 DEGS. WITH MY RESPONSE, I SAID WE HAD STARTED A DSCNT DUE TO AN RA. THE TFC TARGET DISAPPEARED WHEN WE WERE APPROX 300 FT BELOW IT. WE DID NOT SEE ANY ACFT CORRESPONDING TO THE RA.
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.