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Air carrier X same altitude assigned TCASII RA had less than standard separation with air carrier Y. System error. Evasive action taken.
| Attributes | |
| ACN | 273806 |
| Time | |
| Date | 199406 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rod |
| State Reference | OH |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise 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 : 240 flight time total : 10000 flight time type : 1400 |
| ASRS Report | 273806 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 3800 flight time type : 340 |
| ASRS Report | 273796 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 18000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
Air carrier X in cruise at FL310 (assigned by cle) just south of rod a TCASII contact came up at 11 O'clock, quickly going from TA to RA. We looked out and spotted an air carrier Y, dc-10, coming right at us, co-altitude. The TCASII commanded a descent. I disconnected the autoplt while the first officer attempted to contact ATC. It took several attempts before the controller answered. When she finally did respond she quickly gave us a frequency change. When questioned about the incident she said we were off her scope. We had descended to FL300 in response to TCASII. When clear we climbed back to FL310. When we got to bna we talked to ZID and discovered they were calling us while we were still with ZOB. She obviously forgot about us, our frantic calls merely reminded her that she forgot to switch us to ZID. If it weren't for TCASII this may have been more serious due to the evasive reaction that would have been necessary with less notice of conflict.
Original NASA ASRS Text
Title: ACR X SAME ALT ASSIGNED TCASII RA HAD LTSS WITH ACR Y. SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: ACR X IN CRUISE AT FL310 (ASSIGNED BY CLE) JUST S OF ROD A TCASII CONTACT CAME UP AT 11 O'CLOCK, QUICKLY GOING FROM TA TO RA. WE LOOKED OUT AND SPOTTED AN ACR Y, DC-10, COMING RIGHT AT US, CO-ALT. THE TCASII COMMANDED A DSCNT. I DISCONNECTED THE AUTOPLT WHILE THE FO ATTEMPTED TO CONTACT ATC. IT TOOK SEVERAL ATTEMPTS BEFORE THE CTLR ANSWERED. WHEN SHE FINALLY DID RESPOND SHE QUICKLY GAVE US A FREQ CHANGE. WHEN QUESTIONED ABOUT THE INCIDENT SHE SAID WE WERE OFF HER SCOPE. WE HAD DSNDED TO FL300 IN RESPONSE TO TCASII. WHEN CLR WE CLBED BACK TO FL310. WHEN WE GOT TO BNA WE TALKED TO ZID AND DISCOVERED THEY WERE CALLING US WHILE WE WERE STILL WITH ZOB. SHE OBVIOUSLY FORGOT ABOUT US, OUR FRANTIC CALLS MERELY REMINDED HER THAT SHE FORGOT TO SWITCH US TO ZID. IF IT WEREN'T FOR TCASII THIS MAY HAVE BEEN MORE SERIOUS DUE TO THE EVASIVE REACTION THAT WOULD HAVE BEEN NECESSARY WITH LESS NOTICE OF CONFLICT.
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.