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Air carrier X TCASII TA less than standard separation from descending aircraft in IMC. Evasive action taken. System error.
| Attributes | |
| ACN | 293457 |
| Time | |
| Date | 199501 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : agc |
| State Reference | PA |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cmh |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| 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 | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9000 flight time type : 5000 |
| ASRS Report | 293457 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X from pit to atl on a heading of 190 degrees to intercept the agc 221 degree radial, passing 7000 ft MSL for assigned altitude of 14000 ft MSL. Departure initially pointed out traffic ahead and stated we would pass behind this traffic. Moments later, departure requested a right turn 050 degrees. At the same time we had a TA on our TCASII. Without delay I initiated a right descending turn away from the target. At the moment of the TA the target was plus 400 ft descending. On 20 mi scale the target and my aircraft was nearly overlapped. The stress level in the controller's voice indicated as rapid a response as possible was desirable. It is unknown how close we were to the target. The conditions were IMC.
Original NASA ASRS Text
Title: ACR X TCASII TA LTSS FROM DSNDING ACFT IN IMC. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: ACR X FROM PIT TO ATL ON A HDG OF 190 DEGS TO INTERCEPT THE AGC 221 DEG RADIAL, PASSING 7000 FT MSL FOR ASSIGNED ALT OF 14000 FT MSL. DEP INITIALLY POINTED OUT TFC AHEAD AND STATED WE WOULD PASS BEHIND THIS TFC. MOMENTS LATER, DEP REQUESTED A R TURN 050 DEGS. AT THE SAME TIME WE HAD A TA ON OUR TCASII. WITHOUT DELAY I INITIATED A R DSNDING TURN AWAY FROM THE TARGET. AT THE MOMENT OF THE TA THE TARGET WAS PLUS 400 FT DSNDING. ON 20 MI SCALE THE TARGET AND MY ACFT WAS NEARLY OVERLAPPED. THE STRESS LEVEL IN THE CTLR'S VOICE INDICATED AS RAPID A RESPONSE AS POSSIBLE WAS DESIRABLE. IT IS UNKNOWN HOW CLOSE WE WERE TO THE TARGET. THE CONDITIONS WERE IMC.
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.