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After the flight crew of a widebody transport were requested by ATC to increase speed for traffic separation, they found that the subsequent ATC center knew nothing of the increase when they asked to go back to the slower speed.
| Attributes | |
| ACN | 439060 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : egpe.airport |
| State Reference | FO |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 2 | |
| Controlling Facilities | artcc : egpx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 25000 flight time type : 300 |
| ASRS Report | 439060 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
Approximately 50 mi east of 55n10w, we were instructed by scottish control to increase our speed from assigned mach .84 to maximum (85.5) due to nearness of an aircraft behind us. Crossing 10 mi west, I did not reduce to mach .84 (oceanic clearance speed) as I believed the speed increase to be coordinated with shanwick. At 20 mi west, I requested a speed reduction to mach .84 from shanwick oceanic and they knew nothing of our mach 85.5 speed. I was told to reduce immediately to mach .84 as assigned. Apparently there was a communication failure between scottish control, shanwick oceanic, and our flight.
Original NASA ASRS Text
Title: AFTER THE FLC OF A WDB WERE REQUESTED BY ATC TO INCREASE SPD FOR TFC SEPARATION, THEY FOUND THAT THE SUBSEQUENT ATC CTR KNEW NOTHING OF THE INCREASE WHEN THEY ASKED TO GO BACK TO THE SLOWER SPD.
Narrative: APPROX 50 MI E OF 55N10W, WE WERE INSTRUCTED BY SCOTTISH CTL TO INCREASE OUR SPD FROM ASSIGNED MACH .84 TO MAX (85.5) DUE TO NEARNESS OF AN ACFT BEHIND US. XING 10 MI W, I DID NOT REDUCE TO MACH .84 (OCEANIC CLRNC SPD) AS I BELIEVED THE SPD INCREASE TO BE COORDINATED WITH SHANWICK. AT 20 MI W, I REQUESTED A SPD REDUCTION TO MACH .84 FROM SHANWICK OCEANIC AND THEY KNEW NOTHING OF OUR MACH 85.5 SPD. I WAS TOLD TO REDUCE IMMEDIATELY TO MACH .84 AS ASSIGNED. APPARENTLY THERE WAS A COM FAILURE BTWN SCOTTISH CTL, SHANWICK OCEANIC, AND OUR FLT.
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.