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Large transport in climb from FL370 had less than standard separation with widebody transport at FL370.
| Attributes | |
| ACN | 119826 |
| Time | |
| Date | 198908 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bka |
| State Reference | AK |
| Altitude | msl bound lower : 37000 msl bound upper : 37300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : pacific enroute airway : zan |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 15000 flight time type : 2500 |
| ASRS Report | 119826 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 10000 flight time type : 1070 |
| ASRS Report | 119670 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 1500 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Our aircraft, an large transport, was southbound at 370. We could hear a garbled transmission for a flight to climb immediately to 390. On the second or third call we recognized our flight number. We began to climb, however, the aircraft responded slowly. At this point we made visual with a widebody transport opposite direction and made a left turn while climbing. After the widebody transport passed we advised center and returned to 370 on course. I do not recall whether the voices on the frequency were background or another flight calling at the same time. The turn we made gave us greater separation then the climb did due to the aircraft's weight (200,000 pounds at the time). The actual distance between the 2 aircraft was difficult to judge.
Original NASA ASRS Text
Title: LGT IN CLIMB FROM FL370 HAD LESS THAN STANDARD SEPARATION WITH WDB AT FL370.
Narrative: OUR ACFT, AN LGT, WAS SBND AT 370. WE COULD HEAR A GARBLED XMISSION FOR A FLT TO CLIMB IMMEDIATELY TO 390. ON THE SECOND OR THIRD CALL WE RECOGNIZED OUR FLT NUMBER. WE BEGAN TO CLIMB, HOWEVER, THE ACFT RESPONDED SLOWLY. AT THIS POINT WE MADE VISUAL WITH A WDB OPPOSITE DIRECTION AND MADE A LEFT TURN WHILE CLIMBING. AFTER THE WDB PASSED WE ADVISED CENTER AND RETURNED TO 370 ON COURSE. I DO NOT RECALL WHETHER THE VOICES ON THE FREQ WERE BACKGROUND OR ANOTHER FLT CALLING AT THE SAME TIME. THE TURN WE MADE GAVE US GREATER SEPARATION THEN THE CLIMB DID DUE TO THE ACFT'S WEIGHT (200,000 LBS AT THE TIME). THE ACTUAL DISTANCE BETWEEN THE 2 ACFT WAS DIFFICULT TO JUDGE.
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.