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B757 flight crew slowed aircraft during descent without advising approach controller who was expecting the higher speed given by the ARTCC controller prior to handoff to approach. This caused a loss of standard separation with trailing traffic.
| Attributes | |
| ACN | 535948 |
| Time | |
| Date | 200201 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : den.airport |
| State Reference | CO |
| Altitude | msl bound lower : 11000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tracon : d01.tracon tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : dandd.dandd3 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : multi engine pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 220 flight time total : 8500 flight time type : 1360 |
| ASRS Report | 535948 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 20000 flight time type : 800 |
| ASRS Report | 535949 |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Descending into den on dandd arrival. ATC cleared us to cross dandd at FL190 and 280 KIAS. After complying with that clearance and past dandd, we were handed off to den approach. Approach gave us descent to 13000 ft and expect runway 7. Approach descended us to 11000 ft and gave vectors to final. (No speed assignment given by den approach). We slowed to 250 KIAS after handoff from ZDV and approximately 30 mi from airport at 10000 ft AGL. Approaching 10 mi from airport at 11000 ft MSL, continued slowing. On downwind approach, asked if we were still at 250 KIAS. We answered 'no' and asked if he wanted us at 250 KTS. He said that was our assigned speed, and because we slowed we were losing separation with aircraft behind us. He gave us a phone number to call to speak to a supervisor. Supervisor verified we had not been assigned 250 KTS, however, we should have maintained our last assigned airspeed of 280 KTS at dandd. We should have notified approach when we slowed.
Original NASA ASRS Text
Title: B757 FLC SLOWED ACFT DURING DSCNT WITHOUT ADVISING APCH CTLR WHO WAS EXPECTING THE HIGHER SPD GIVEN BY THE ARTCC CTLR PRIOR TO HDOF TO APCH. THIS CAUSED A LOSS OF STANDARD SEPARATION WITH TRAILING TFC.
Narrative: DSNDING INTO DEN ON DANDD ARR. ATC CLRED US TO CROSS DANDD AT FL190 AND 280 KIAS. AFTER COMPLYING WITH THAT CLRNC AND PAST DANDD, WE WERE HANDED OFF TO DEN APCH. APCH GAVE US DSCNT TO 13000 FT AND EXPECT RWY 7. APCH DSNDED US TO 11000 FT AND GAVE VECTORS TO FINAL. (NO SPD ASSIGNMENT GIVEN BY DEN APCH). WE SLOWED TO 250 KIAS AFTER HDOF FROM ZDV AND APPROX 30 MI FROM ARPT AT 10000 FT AGL. APCHING 10 MI FROM ARPT AT 11000 FT MSL, CONTINUED SLOWING. ON DOWNWIND APCH, ASKED IF WE WERE STILL AT 250 KIAS. WE ANSWERED 'NO' AND ASKED IF HE WANTED US AT 250 KTS. HE SAID THAT WAS OUR ASSIGNED SPD, AND BECAUSE WE SLOWED WE WERE LOSING SEPARATION WITH ACFT BEHIND US. HE GAVE US A PHONE NUMBER TO CALL TO SPEAK TO A SUPVR. SUPVR VERIFIED WE HAD NOT BEEN ASSIGNED 250 KTS, HOWEVER, WE SHOULD HAVE MAINTAINED OUR LAST ASSIGNED AIRSPD OF 280 KTS AT DANDD. WE SHOULD HAVE NOTIFIED APCH WHEN WE SLOWED.
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.