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Near midair collision between air carrier medium large transport and other aircraft operating at wrong altitude in TCA.
| Attributes | |
| ACN | 132217 |
| Time | |
| Date | 198912 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 10750 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other cruise other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other cruise other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 275 flight time total : 7000 flight time type : 2500 |
| ASRS Report | 132217 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 400 vertical : 250 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On right downwind to runway 8R den, while level at 11000' MSL observed a twin engine business jet at 1:30, approximately level 1/4 NM away and closing from right to left, as ATC simultaneously called the traffic. Descended 250' as the other aircraft passed in front and above our aircraft. Talked to approach controller after blocking-in and learned other aircraft was at 11100' MSL, but was only cleared to 12000' MSL. Upon deplaning one passenger asked, 'how close was that other airplane?' I was 50' low on altitude and correcting back to altitude precisely as the encounter took place! Being precisely at 11000' MSL on the altimeter would not have mattered had a midair occurred. Watch out!
Original NASA ASRS Text
Title: NMAC BETWEEN ACR MLG AND OTHER ACFT OPERATING AT WRONG ALT IN TCA.
Narrative: ON RIGHT DOWNWIND TO RWY 8R DEN, WHILE LEVEL AT 11000' MSL OBSERVED A TWIN ENG BUSINESS JET AT 1:30, APPROX LEVEL 1/4 NM AWAY AND CLOSING FROM RIGHT TO LEFT, AS ATC SIMULTANEOUSLY CALLED THE TFC. DSNDED 250' AS THE OTHER ACFT PASSED IN FRONT AND ABOVE OUR ACFT. TALKED TO APCH CTLR AFTER BLOCKING-IN AND LEARNED OTHER ACFT WAS AT 11100' MSL, BUT WAS ONLY CLRED TO 12000' MSL. UPON DEPLANING ONE PAX ASKED, 'HOW CLOSE WAS THAT OTHER AIRPLANE?' I WAS 50' LOW ON ALT AND CORRECTING BACK TO ALT PRECISELY AS THE ENCOUNTER TOOK PLACE! BEING PRECISELY AT 11000' MSL ON THE ALTIMETER WOULD NOT HAVE MATTERED HAD A MIDAIR OCCURRED. WATCH OUT!
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.