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Airorne conflict between air carrier medium large transport X and unknown twin engine turboprop small transport Y near ord.
| Attributes | |
| ACN | 141006 |
| Time | |
| Date | 199003 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 9000 msl bound upper : 9700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 2000 flight time type : 400 |
| ASRS Report | 141006 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 100 vertical : 750 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
As the F/east I advised the captain of traffic from 6-8 mi out at our 1 O'clock position to 1/4 mi off our nose. Second officer: 'traffic Y 1 O'clock 6 mi slightly low', then 'traffic Y 12 O'clock 4 mi, twin engine turbo-propeller about 9000' below us, possible VFR, heading same direction.' and then 'traffic Y 1-2 mi off the nose at about 9000' same direction'. ATC cleared us to descend from 10000' level 9000' and captain acknowledged, then began his descent. I said 'traffic Y 1/4 mi going under our nose at less than 1000'. The captain said 'I don't see the guy' and he continued descent over the top of traffic. I told the captain I was very nervous about that and he replied, 'he is probably being vectored below us and stepped down with us, besides we were probably going faster.' ATC never called out the traffic nor were any transmissions heard from or to other aircraft. When on ground and taxiing into gate I asked if either one of the captain or first officer were at all uncomfortable about descending down over the top of another aircraft. Captain responded 'I never saw the guy'. First officer said nothing.
Original NASA ASRS Text
Title: AIRORNE CONFLICT BETWEEN ACR MLG X AND UNKNOWN TWIN ENGINE TURBOPROP SMT Y NEAR ORD.
Narrative: AS THE F/E I ADVISED THE CAPT OF TFC FROM 6-8 MI OUT AT OUR 1 O'CLOCK POS TO 1/4 MI OFF OUR NOSE. S/O: 'TFC Y 1 O'CLOCK 6 MI SLIGHTLY LOW', THEN 'TFC Y 12 O'CLOCK 4 MI, TWIN ENG TURBO-PROP ABOUT 9000' BELOW US, POSSIBLE VFR, HDG SAME DIRECTION.' AND THEN 'TFC Y 1-2 MI OFF THE NOSE AT ABOUT 9000' SAME DIRECTION'. ATC CLRED US TO DSND FROM 10000' LEVEL 9000' AND CAPT ACKNOWLEDGED, THEN BEGAN HIS DSCNT. I SAID 'TFC Y 1/4 MI GOING UNDER OUR NOSE AT LESS THAN 1000'. THE CAPT SAID 'I DON'T SEE THE GUY' AND HE CONTINUED DSCNT OVER THE TOP OF TFC. I TOLD THE CAPT I WAS VERY NERVOUS ABOUT THAT AND HE REPLIED, 'HE IS PROBABLY BEING VECTORED BELOW US AND STEPPED DOWN WITH US, BESIDES WE WERE PROBABLY GOING FASTER.' ATC NEVER CALLED OUT THE TFC NOR WERE ANY TRANSMISSIONS HEARD FROM OR TO OTHER ACFT. WHEN ON GND AND TAXIING INTO GATE I ASKED IF EITHER ONE OF THE CAPT OR F/O WERE AT ALL UNCOMFORTABLE ABOUT DSNDING DOWN OVER THE TOP OF ANOTHER ACFT. CAPT RESPONDED 'I NEVER SAW THE GUY'. F/O SAID NOTHING.
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.