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Air carrier climbed above assigned altitude, thereby necessitating radar vectors to avoid a loss of separation with another aircraft.
| Attributes | |
| ACN | 118130 |
| Time | |
| Date | 198907 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| 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 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Experience | controller military : 2 controller radar : 18 |
| ASRS Report | 118130 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X departed den, southbound. The center controller issued a climb clearance to FL230, due to traffic on a crossing course descending to FL240. The controller advised air carrier X: 'due to traffic at FL240, expect higher in 4 minutes'. Air carrier X responded: 'ok FL240, higher in 4 minutes'. Air carrier X was observed climbing to an altitude above FL230 by mode C radar data. The controller issued radar vectors to both aircraft to prevent an ATC system deviation. The pilots lack of correct phraseology and poor listening skills was the main cause of this incident. If the pilot had stated 'climbing to FL240...', the controller may have been able to correct the pilot, and prevent an imminent situation.
Original NASA ASRS Text
Title: ACR CLIMBED ABOVE ASSIGNED ALT, THEREBY NECESSITATING RADAR VECTORS TO AVOID A LOSS OF SEPARATION WITH ANOTHER ACFT.
Narrative: ACR X DEPARTED DEN, SBND. THE CENTER CTLR ISSUED A CLIMB CLRNC TO FL230, DUE TO TFC ON A XING COURSE DESCENDING TO FL240. THE CTLR ADVISED ACR X: 'DUE TO TFC AT FL240, EXPECT HIGHER IN 4 MINUTES'. ACR X RESPONDED: 'OK FL240, HIGHER IN 4 MINUTES'. ACR X WAS OBSERVED CLIMBING TO AN ALT ABOVE FL230 BY MODE C RADAR DATA. THE CTLR ISSUED RADAR VECTORS TO BOTH ACFT TO PREVENT AN ATC SYSTEM DEVIATION. THE PLTS LACK OF CORRECT PHRASEOLOGY AND POOR LISTENING SKILLS WAS THE MAIN CAUSE OF THIS INCIDENT. IF THE PLT HAD STATED 'CLIMBING TO FL240...', THE CTLR MAY HAVE BEEN ABLE TO CORRECT THE PLT, AND PREVENT AN IMMINENT SITUATION.
Data retrieved from NASA's ASRS site as of August 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.