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Near midair collision between a B757 leveloff during climb by departure controller and another aircraft descending down through their altitude after being instructed by ATC to leveloff 1000 ft above the B757.
| Attributes | |
| ACN | 532270 |
| Time | |
| Date | 200112 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 14200 flight time type : 1600 |
| ASRS Report | 532270 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued alert controller : issued new clearance controller : separated traffic flight crew : took precautionary avoidance action |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were told to level 10000 ft. Other aircraft told to level 11000 ft. Controller instructed aircraft #2 to maintain 11000 ft. They kept descending after passing 10500 ft. Controller asked their altitude. Controller told them they were assigned 11000 ft. They started climbing. Then immediately started back down again. Passed within 300 ft of our aircraft. We only received a TA.
Original NASA ASRS Text
Title: NMAC BTWN A B757 LEVELOFF DURING CLB BY DEP CTLR AND ANOTHER ACFT DSNDING DOWN THROUGH THEIR ALT AFTER BEING INSTRUCTED BY ATC TO LEVELOFF 1000 FT ABOVE THE B757.
Narrative: WE WERE TOLD TO LEVEL 10000 FT. OTHER ACFT TOLD TO LEVEL 11000 FT. CTLR INSTRUCTED ACFT #2 TO MAINTAIN 11000 FT. THEY KEPT DSNDING AFTER PASSING 10500 FT. CTLR ASKED THEIR ALT. CTLR TOLD THEM THEY WERE ASSIGNED 11000 FT. THEY STARTED CLBING. THEN IMMEDIATELY STARTED BACK DOWN AGAIN. PASSED WITHIN 300 FT OF OUR ACFT. WE ONLY RECEIVED A TA.
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.