 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier X TCASII RA had less than standard separation with air carrier Y. Evasive action taken. System error.
| Attributes | |
| ACN | 257627 |
| Time | |
| Date | 199311 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ekdk |
| State Reference | FO |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ekdk artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| 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 | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 : 190 flight time total : 13500 flight time type : 1700 |
| ASRS Report | 257627 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| 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 : 5000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X in cruise at assigned FL350, first officer flying. A TA occurs on the TCASII coming onto the scope at 2 O'clock at 6 mi. Within seconds an RA occurs, at about the same time the first officer spots the traffic at our flight level. The captain disconnects autoplt and follows the TCASII RA in a 1500 FPM descent to FL342. First officer contacts ATC, and is advised to turn right by ATC, but, by this time we are well into descent. Air carrier Y also saw us. I do not know if he climbed. When he passed in front of and above us, he was about 5000 ft away. We had been with this controller for 15-20 mins. We had been cleared direct to aspit and this put us to the south of airway UN582. The controller knew we were at the same flight level but his earlier plan showed air carrier Y passing well ahead of us. He must have failed to check this as we got closer.
Original NASA ASRS Text
Title: ACR X TCASII RA HAD LTSS WITH ACR Y. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: ACR X IN CRUISE AT ASSIGNED FL350, FO FLYING. A TA OCCURS ON THE TCASII COMING ONTO THE SCOPE AT 2 O'CLOCK AT 6 MI. WITHIN SECONDS AN RA OCCURS, AT ABOUT THE SAME TIME THE FO SPOTS THE TFC AT OUR FLT LEVEL. THE CAPT DISCONNECTS AUTOPLT AND FOLLOWS THE TCASII RA IN A 1500 FPM DSCNT TO FL342. FO CONTACTS ATC, AND IS ADVISED TO TURN R BY ATC, BUT, BY THIS TIME WE ARE WELL INTO DSCNT. ACR Y ALSO SAW US. I DO NOT KNOW IF HE CLBED. WHEN HE PASSED IN FRONT OF AND ABOVE US, HE WAS ABOUT 5000 FT AWAY. WE HAD BEEN WITH THIS CTLR FOR 15-20 MINS. WE HAD BEEN CLRED DIRECT TO ASPIT AND THIS PUT US TO THE S OF AIRWAY UN582. THE CTLR KNEW WE WERE AT THE SAME FLT LEVEL BUT HIS EARLIER PLAN SHOWED ACR Y PASSING WELL AHEAD OF US. HE MUST HAVE FAILED TO CHK THIS AS WE GOT CLOSER.
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.