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Air carrier Y climb to occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 202549 |
| Time | |
| Date | 199202 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : azo |
| State Reference | MI |
| Altitude | msl bound lower : 17000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| 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 |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2 |
| ASRS Report | 202529 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
This situation involved 4 aircraft all being 'stepped up' underneath one another. Controller though that air carrier X had been climbed to FL230 when he actually had only been cleared to 170. Air carrier Y was being 'stepped up' 140, 160 and eventually to 170 where separation was lost. The use of interim altitudes in the data block could have prevented this, but we have a waiver that lets us not use interim altitude displays at this departure sector due to workload. Overall a better awareness could also have prevented this error.
Original NASA ASRS Text
Title: ACR Y CLB TO OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: THIS SITUATION INVOLVED 4 ACFT ALL BEING 'STEPPED UP' UNDERNEATH ONE ANOTHER. CTLR THOUGH THAT ACR X HAD BEEN CLBED TO FL230 WHEN HE ACTUALLY HAD ONLY BEEN CLRED TO 170. ACR Y WAS BEING 'STEPPED UP' 140, 160 AND EVENTUALLY TO 170 WHERE SEPARATION WAS LOST. THE USE OF INTERIM ALTS IN THE DATA BLOCK COULD HAVE PREVENTED THIS, BUT WE HAVE A WAIVER THAT LETS US NOT USE INTERIM ALT DISPLAYS AT THIS DEP SECTOR DUE TO WORKLOAD. OVERALL A BETTER AWARENESS COULD ALSO HAVE PREVENTED THIS ERROR.
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.