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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier medium large transport in IMC at 7000 ft got a TCASII RA from another air carrier aircraft 800 ft lower and climbing. Reporter climbed to 8000 ft. ATC claimed they were unaware of the conflict. Possibilities are that reporter was beneath assigned altitude or aircraft Y was above assigned altitude or ATC assigned an aircraft the wrong altitude.
| Attributes | |
| ACN | 362177 |
| Time | |
| Date | 199703 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ftz airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 7000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| 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 : 210 flight time total : 19000 flight time type : 16800 |
| ASRS Report | 362177 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac non adherence other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 0 vertical : 400 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
Approach control cleared us to cross snydr intersection at 7000 ft and turn right to 130 degrees at snydr. Just as we started the turn, the TCASII displayed a brief TA (yellow) immediately followed by an RA (red) to climb. At that time the target was at 800 ft and closing. We made a maximum climb to 8000 ft and the target came within 400 ft, when we were at 7800 ft. The TCASII then announced 'clear of conflict' and we descended to 7000 ft. ATC didn't seem to be aware of our climb or the conflict when we relayed the information on the radio. They were unaware of the conflict on the followup telephone call.
Original NASA ASRS Text
Title: ACR MLG IN IMC AT 7000 FT GOT A TCASII RA FROM ANOTHER ACR ACFT 800 FT LOWER AND CLBING. RPTR CLBED TO 8000 FT. ATC CLAIMED THEY WERE UNAWARE OF THE CONFLICT. POSSIBILITIES ARE THAT RPTR WAS BENEATH ASSIGNED ALT OR ACFT Y WAS ABOVE ASSIGNED ALT OR ATC ASSIGNED AN ACFT THE WRONG ALT.
Narrative: APCH CTL CLRED US TO CROSS SNYDR INTXN AT 7000 FT AND TURN R TO 130 DEGS AT SNYDR. JUST AS WE STARTED THE TURN, THE TCASII DISPLAYED A BRIEF TA (YELLOW) IMMEDIATELY FOLLOWED BY AN RA (RED) TO CLB. AT THAT TIME THE TARGET WAS AT 800 FT AND CLOSING. WE MADE A MAX CLB TO 8000 FT AND THE TARGET CAME WITHIN 400 FT, WHEN WE WERE AT 7800 FT. THE TCASII THEN ANNOUNCED 'CLR OF CONFLICT' AND WE DSNDED TO 7000 FT. ATC DIDN'T SEEM TO BE AWARE OF OUR CLB OR THE CONFLICT WHEN WE RELAYED THE INFO ON THE RADIO. THEY WERE UNAWARE OF THE CONFLICT ON THE FOLLOWUP TELEPHONE CALL.
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.