 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Commuter aircraft has near midair collision with company aircraft cleared to descend from higher altitude.
| Attributes | |
| ACN | 182341 |
| Time | |
| Date | 199106 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 240 flight time total : 2500 flight time type : 800 |
| ASRS Report | 182341 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 3200 flight time type : 1300 |
| ASRS Report | 182329 |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were westbound at an assigned altitude of 11000', positioned as stated above. We were waiting for a visibility approach clearance. ATC was very busy and had not given us clearance yet, but cleared a company light transport who was on a left downwind to turn base and descend. Company aircraft was higher than us and descending directly into our flight path. At that time a different ATC controller interrupted and told us to turn left heading 170 degrees. The company aircraft leveled out as we were turning left. The company aircraft went directly over us at approximately 200' while we were turning. ATC workload and confusion were probably responsible.
Original NASA ASRS Text
Title: COMMUTER ACFT HAS NMAC WITH COMPANY ACFT CLEARED TO DESCEND FROM HIGHER ALT.
Narrative: WE WERE WBND AT AN ASSIGNED ALT OF 11000', POSITIONED AS STATED ABOVE. WE WERE WAITING FOR A VIS APCH CLRNC. ATC WAS VERY BUSY AND HAD NOT GIVEN US CLRNC YET, BUT CLRED A COMPANY LTT WHO WAS ON A LEFT DOWNWIND TO TURN BASE AND DSND. COMPANY ACFT WAS HIGHER THAN US AND DSNDING DIRECTLY INTO OUR FLT PATH. AT THAT TIME A DIFFERENT ATC CTLR INTERRUPTED AND TOLD US TO TURN LEFT HDG 170 DEGS. THE COMPANY ACFT LEVELED OUT AS WE WERE TURNING LEFT. THE COMPANY ACFT WENT DIRECTLY OVER US AT APPROX 200' WHILE WE WERE TURNING. ATC WORKLOAD AND CONFUSION WERE PROBABLY RESPONSIBLE.
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.