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2 air carrier aircraft had less than standard separation. Neither aircraft followed its TCASII command.
| Attributes | |
| ACN | 236198 |
| Time | |
| Date | 199303 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | KY |
| Altitude | msl bound lower : 26000 msl bound upper : 27300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 12000 flight time type : 10000 |
| ASRS Report | 236198 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 15000 vertical : 800 |
Narrative:
TCASII told us to climb when we were supposed to level at FL260. Our information says 'air carrier medium large transport 2' got a descend command. It appears air carrier 2 was above us climbing and we were climbing so fast to FL260 that the TCASII decided we would climb and air carrier 2 should descend. We think air carrier 2 started to deviate on a TCASII alert and then stopped. He did announce he was deviating on a TCASII alert. It appears that, if we had climbed as per the instructions, we would have climbed right at air carrier 2. TCASII report filed we think by air carrier 2 and by ZME. Supplemental information from acn 236477: we were at 26000 ft in cruise and received a climb clearance to 28000 ft. As we were climbing through approximately 27300, we got a TCASII 'TA' and then almost immediately we got an 'RA' with 'don't climb' and a 1500 FPM descent command. There was an air carrier 1 medium large transport approximately 3 mi on our right at 26000. He had been given a climb to 27000, and he too was receiving an RA that was commanding a climb. We stopped our descent at 26700 because I could see the other aircraft was below us. If we both had followed the TCASII commands, I feel we would have been in a very dangerous situation. The controller said he was glad that we stopped our descent because the other aircraft was below us. Luckily, the other aircraft didn't climb too much, or I think we would have been really close to each other.
Original NASA ASRS Text
Title: 2 ACR ACFT HAD LTSS. NEITHER ACFT FOLLOWED ITS TCASII COMMAND.
Narrative: TCASII TOLD US TO CLB WHEN WE WERE SUPPOSED TO LEVEL AT FL260. OUR INFO SAYS 'ACR MLG 2' GOT A DSND COMMAND. IT APPEARS ACR 2 WAS ABOVE US CLBING AND WE WERE CLBING SO FAST TO FL260 THAT THE TCASII DECIDED WE WOULD CLB AND ACR 2 SHOULD DSND. WE THINK ACR 2 STARTED TO DEVIATE ON A TCASII ALERT AND THEN STOPPED. HE DID ANNOUNCE HE WAS DEVIATING ON A TCASII ALERT. IT APPEARS THAT, IF WE HAD CLBED AS PER THE INSTRUCTIONS, WE WOULD HAVE CLBED RIGHT AT ACR 2. TCASII RPT FILED WE THINK BY ACR 2 AND BY ZME. SUPPLEMENTAL INFO FROM ACN 236477: WE WERE AT 26000 FT IN CRUISE AND RECEIVED A CLB CLRNC TO 28000 FT. AS WE WERE CLBING THROUGH APPROX 27300, WE GOT A TCASII 'TA' AND THEN ALMOST IMMEDIATELY WE GOT AN 'RA' WITH 'DON'T CLB' AND A 1500 FPM DSCNT COMMAND. THERE WAS AN ACR 1 MLG APPROX 3 MI ON OUR R AT 26000. HE HAD BEEN GIVEN A CLB TO 27000, AND HE TOO WAS RECEIVING AN RA THAT WAS COMMANDING A CLB. WE STOPPED OUR DSCNT AT 26700 BECAUSE I COULD SEE THE OTHER ACFT WAS BELOW US. IF WE BOTH HAD FOLLOWED THE TCASII COMMANDS, I FEEL WE WOULD HAVE BEEN IN A VERY DANGEROUS SIT. THE CTLR SAID HE WAS GLAD THAT WE STOPPED OUR DSCNT BECAUSE THE OTHER ACFT WAS BELOW US. LUCKILY, THE OTHER ACFT DIDN'T CLB TOO MUCH, OR I THINK WE WOULD HAVE BEEN REALLY CLOSE TO EACH OTHER.
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.