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An air carrier light transport flight crew reacts to an RA and climbs 500 ft to clear traffic that was just under the floor of the TCA.
| Attributes | |
| ACN | 346844 |
| Time | |
| Date | 199609 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : clt |
| State Reference | NC |
| Altitude | msl bound lower : 5000 msl bound upper : 5500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : clt tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 280 flight time total : 4700 flight time type : 1100 |
| ASRS Report | 346844 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On initial approach into clt, ATC called traffic 2 times. Crew was unable to locate visually. TCASII RA issued 'climb' command. We climbed aircraft to 5500 ft momentarily until clear of conflict, then descended back to 5000 ft as soon as possible. Tried to let ATC know what was happening, but frequency was very busy. My guess is that the aircraft was just under class B airspace not talking to ATC and hit turbulence and climbed to 4700 ft underneath our airplane at 5000 ft. Solution would be to have VFR aircraft talking to ATC and giving class B airspace a wider margin when transiting.
Original NASA ASRS Text
Title: AN ACR LTT FLC REACTS TO AN RA AND CLBS 500 FT TO CLR TFC THAT WAS JUST UNDER THE FLOOR OF THE TCA.
Narrative: ON INITIAL APCH INTO CLT, ATC CALLED TFC 2 TIMES. CREW WAS UNABLE TO LOCATE VISUALLY. TCASII RA ISSUED 'CLB' COMMAND. WE CLBED ACFT TO 5500 FT MOMENTARILY UNTIL CLR OF CONFLICT, THEN DSNDED BACK TO 5000 FT ASAP. TRIED TO LET ATC KNOW WHAT WAS HAPPENING, BUT FREQ WAS VERY BUSY. MY GUESS IS THAT THE ACFT WAS JUST UNDER CLASS B AIRSPACE NOT TALKING TO ATC AND HIT TURB AND CLBED TO 4700 FT UNDERNEATH OUR AIRPLANE AT 5000 FT. SOLUTION WOULD BE TO HAVE VFR ACFT TALKING TO ATC AND GIVING CLASS B AIRSPACE A WIDER MARGIN WHEN TRANSITING.
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.