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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier X similar number descent to occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 251024 |
| Time | |
| Date | 199309 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 15000 msl bound upper : 15300 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : tncf |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : zdv |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| 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 : 250 flight time total : 9300 flight time type : 3000 |
| ASRS Report | 251024 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X57 was addressed as air carrier X67 and instructed to descend to 16000 ft. When we clarified our number as air carrier X57, the controller issued 15000 ft for air carrier X57 and we read back 15000 ft. At 15300 ft controller asked to verify at 16000 ft. We told him we weren't and were told to climb back to 16000 ft. A few mins later we were given a phone number to call concerning a possible pilot deviation. Our chief pilot called the number and was told it was an operational error with air carrier Y and that there was also training going on at the time. The problem: similar sounding flight numbers create confusion almost on a daily basis.
Original NASA ASRS Text
Title: ACR X SIMILAR NUMBER DSCNT TO OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X57 WAS ADDRESSED AS ACR X67 AND INSTRUCTED TO DSND TO 16000 FT. WHEN WE CLARIFIED OUR NUMBER AS ACR X57, THE CTLR ISSUED 15000 FT FOR ACR X57 AND WE READ BACK 15000 FT. AT 15300 FT CTLR ASKED TO VERIFY AT 16000 FT. WE TOLD HIM WE WEREN'T AND WERE TOLD TO CLB BACK TO 16000 FT. A FEW MINS LATER WE WERE GIVEN A PHONE NUMBER TO CALL CONCERNING A POSSIBLE PLTDEV. OUR CHIEF PLT CALLED THE NUMBER AND WAS TOLD IT WAS AN OPERROR WITH ACR Y AND THAT THERE WAS ALSO TRAINING GOING ON AT THE TIME. THE PROB: SIMILAR SOUNDING FLT NUMBERS CREATE CONFUSION ALMOST ON A DAILY BASIS.
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.