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A carj flight crew; cleared to descend via the hyper one arrival to iad; descends from an interim controller assigned altitude believing that the previously issued clearance allowed further descent in accordance with the published arrival.
| Attributes | |
| ACN | 646840 |
| Time | |
| Date | 200501 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iad.airport |
| State Reference | VA |
| Altitude | msl bound lower : 6600 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude ground : maintenance |
| Route In Use | arrival star : hyper one |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 6100 flight time type : 2000 |
| ASRS Report | 646840 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory |
| 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 | Pilot Deviation |
Narrative:
We were 10000 ft over mulrr intersection on the hyper one arrival. Potomac approach cleared us to descend via the hyper one arrival. We were ready to start our descent when potomac approach told us to descend to 7000 ft. We descended to 7000 ft. When we crossed signe intersection we started a descent to cross mowat at 5000 ft as directed by the arrival. At approximately 6600 ft; the controller told us to stop our descent because we were only cleared to 7000 ft. He advised that he had traffic below us at 6000 ft. We were descending via the hyper one just as we were cleared. I believe this could have been prevented if the approach controller would have told us about the traffic; and would have told us to 'maintain' 7000 ft. Just as another note; there was an aircraft behind us on the hyper one arrival. They were given the same clearance as us. They descended below 7000 ft; and were also stopped by the controller who said they were only cleared to 7000 ft.
Original NASA ASRS Text
Title: A CARJ FLT CREW; CLRED TO DSND VIA THE HYPER ONE ARR TO IAD; DSNDS FROM AN INTERIM CTLR ASSIGNED ALT BELIEVING THAT THE PREVIOUSLY ISSUED CLRNC ALLOWED FURTHER DSCNT IN ACCORDANCE WITH THE PUBLISHED ARR.
Narrative: WE WERE 10000 FT OVER MULRR INTXN ON THE HYPER ONE ARR. POTOMAC APCH CLRED US TO DSND VIA THE HYPER ONE ARR. WE WERE READY TO START OUR DSCNT WHEN POTOMAC APCH TOLD US TO DSND TO 7000 FT. WE DSNDED TO 7000 FT. WHEN WE CROSSED SIGNE INTXN WE STARTED A DSCNT TO CROSS MOWAT AT 5000 FT AS DIRECTED BY THE ARR. AT APPROX 6600 FT; THE CTLR TOLD US TO STOP OUR DSCNT BECAUSE WE WERE ONLY CLRED TO 7000 FT. HE ADVISED THAT HE HAD TFC BELOW US AT 6000 FT. WE WERE DSNDING VIA THE HYPER ONE JUST AS WE WERE CLRED. I BELIEVE THIS COULD HAVE BEEN PREVENTED IF THE APCH CTLR WOULD HAVE TOLD US ABOUT THE TFC; AND WOULD HAVE TOLD US TO 'MAINTAIN' 7000 FT. JUST AS ANOTHER NOTE; THERE WAS AN ACFT BEHIND US ON THE HYPER ONE ARR. THEY WERE GIVEN THE SAME CLRNC AS US. THEY DSNDED BELOW 7000 FT; AND WERE ALSO STOPPED BY THE CTLR WHO SAID THEY WERE ONLY CLRED TO 7000 FT.
Data retrieved from NASA's ASRS site as of January 2009 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.