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Conflicting commands of TCASII RA vs ATC amended clearance of descent to avoid potential conflict less than standard separation.
| Attributes | |
| ACN | 250217 |
| Time | |
| Date | 199308 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sat |
| State Reference | TX |
| Altitude | msl bound lower : 16000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Fighter |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 15000 flight time type : 1 |
| ASRS Report | 250217 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other other : unspecified |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Center cleared our descent to 16000 ft and advised 12 O'clock traffic at 15000 ft. Traffic soon appeared visually and on TCASII at 15900 ft. Questioned center then simultaneously fgt turned, center gave us a descent, and TCASII commanded climb. Traffic passed approximately level inside 2 mi.
Original NASA ASRS Text
Title: CONFLICTING COMMANDS OF TCASII RA VS ATC AMENDED CLRNC OF DSCNT TO AVOID POTENTIAL CONFLICT LTSS.
Narrative: CTR CLRED OUR DSCNT TO 16000 FT AND ADVISED 12 O'CLOCK TFC AT 15000 FT. TFC SOON APPEARED VISUALLY AND ON TCASII AT 15900 FT. QUESTIONED CTR THEN SIMULTANEOUSLY FGT TURNED, CTR GAVE US A DSCNT, AND TCASII COMMANDED CLB. TFC PASSED APPROX LEVEL INSIDE 2 MI.
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.