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Widebody transport issued turns and climb to avoid confliction with an uncontrolled small aircraft.
| Attributes | |
| ACN | 111255 |
| Time | |
| Date | 198905 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sea |
| State Reference | WA |
| Altitude | msl bound lower : 10000 msl bound upper : 10700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 8500 flight time type : 170 |
| ASRS Report | 111255 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 6500 flight time type : 100 |
| ASRS Report | 111401 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 1500 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
En route ord-sea, 5/X/89, descended to 10000' MSL for approach to sea. Under radar vectors of sea approach control on top of broken layer at 10000', heading 240 degrees. ATC reported traffic at our 12 O'clock position 9200' climbing and instructed us to turn right 20 degrees (260 degrees). ATC then reported aircraft was turning towards us and ordered a turn to 290 degrees. Immediately thereafter, ATC ordered us to climb and we initiated an immediate climb to 10700' at which time we spotted said traffic, an small aircraft, passed below and to our left. Estimate said small aircraft was 1/4-1/2 mi away, 500' below us. We were reclred to maintain 10000' and landed at sea. Good traffic handling by sea averted what could have been a much closer conflict in this case. Outstanding cooperation from sea ATC.
Original NASA ASRS Text
Title: WDB ISSUED TURNS AND CLIMB TO AVOID CONFLICTION WITH AN UNCONTROLLED SMA.
Narrative: ENRTE ORD-SEA, 5/X/89, DSNDED TO 10000' MSL FOR APCH TO SEA. UNDER RADAR VECTORS OF SEA APCH CTL ON TOP OF BROKEN LAYER AT 10000', HDG 240 DEGS. ATC RPTED TFC AT OUR 12 O'CLOCK POS 9200' CLBING AND INSTRUCTED US TO TURN RIGHT 20 DEGS (260 DEGS). ATC THEN RPTED ACFT WAS TURNING TOWARDS US AND ORDERED A TURN TO 290 DEGS. IMMEDIATELY THEREAFTER, ATC ORDERED US TO CLB AND WE INITIATED AN IMMEDIATE CLB TO 10700' AT WHICH TIME WE SPOTTED SAID TFC, AN SMA, PASSED BELOW AND TO OUR LEFT. ESTIMATE SAID SMA WAS 1/4-1/2 MI AWAY, 500' BELOW US. WE WERE RECLRED TO MAINTAIN 10000' AND LANDED AT SEA. GOOD TFC HANDLING BY SEA AVERTED WHAT COULD HAVE BEEN A MUCH CLOSER CONFLICT IN THIS CASE. OUTSTANDING COOPERATION FROM SEA ATC.
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.