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D01 controller experienced operational error at 7000 ft when descending aircraft into occupied altitude.
| Attributes | |
| ACN | 701005 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : den.airport |
| State Reference | CO |
| Altitude | msl single value : 7000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude ground : parked |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : charter |
| Make Model Name | PA-31 Navajo Chieftan/Mojave/Navajo T1020 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 5 controller radar : 26 controller supervisory : 1 |
| ASRS Report | 701005 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On approach to den; aircraft X was descended to a base turn from 11000 ft to 7000 ft. 7000 ft MSL was a mistake. Turned toward final for a visual approach in conflict with aircraft Y PA31 on final for runway 17R at 7000 ft (cleared for visual approach). Aircraft X needed to be stopped at 8000 ft and crossed over to the other final; ie; runway 16L (east complex runway 17R west complex). Aircraft X was told to maintain 8000 ft but too late. Visual separation was applied from aircraft Y to aircraft X. Later analysis proved it to be too late.
Original NASA ASRS Text
Title: D01 CTLR EXPERIENCED OPERROR AT 7000 FT WHEN DSNDING ACFT INTO OCCUPIED ALT.
Narrative: ON APCH TO DEN; ACFT X WAS DSNDED TO A BASE TURN FROM 11000 FT TO 7000 FT. 7000 FT MSL WAS A MISTAKE. TURNED TOWARD FINAL FOR A VISUAL APCH IN CONFLICT WITH ACFT Y PA31 ON FINAL FOR RWY 17R AT 7000 FT (CLRED FOR VISUAL APCH). ACFT X NEEDED TO BE STOPPED AT 8000 FT AND CROSSED OVER TO THE OTHER FINAL; IE; RWY 16L (E COMPLEX RWY 17R W COMPLEX). ACFT X WAS TOLD TO MAINTAIN 8000 FT BUT TOO LATE. VISUAL SEPARATION WAS APPLIED FROM ACFT Y TO ACFT X. LATER ANALYSIS PROVED IT TO BE TOO LATE.
Data retrieved from NASA's ASRS site as of January 2009 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.