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Flight crew on a BA41 inbound to iad were given descent clearance to an occupied altitude resulting in an operational error.
| Attributes | |
| ACN | 406163 |
| Time | |
| Date | 199806 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : aml airport : iad |
| State Reference | VA |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 260 flight time total : 8000 flight time type : 900 |
| ASRS Report | 406163 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While descending via instructions from dulles approach from 5000 ft to 4000 ft, we encountered a TA alert on the TCASII. Approach control frequency was saturated. Approximately 30 seconds later approach control told us to level off at 4500 ft. We tried to acknowledge at first but our transmission was broken into by another aircraft. Our second transmission was received and we advised approach control that we had the aircraft visually in sight. We were then given a turn from a 090 degree heading to a 270 degree heading. We were then given a clearance to climb up to 5000 ft. After taking us out of the stream of traffic into runway 1L into iad, we were then vectored to a visual pattern for runway 1L without further incident.
Original NASA ASRS Text
Title: FLC ON A BA41 INBOUND TO IAD WERE GIVEN DSCNT CLRNC TO AN OCCUPIED ALT RESULTING IN AN OPERROR.
Narrative: WHILE DSNDING VIA INSTRUCTIONS FROM DULLES APCH FROM 5000 FT TO 4000 FT, WE ENCOUNTERED A TA ALERT ON THE TCASII. APCH CTL FREQ WAS SATURATED. APPROX 30 SECONDS LATER APCH CTL TOLD US TO LEVEL OFF AT 4500 FT. WE TRIED TO ACKNOWLEDGE AT FIRST BUT OUR XMISSION WAS BROKEN INTO BY ANOTHER ACFT. OUR SECOND XMISSION WAS RECEIVED AND WE ADVISED APCH CTL THAT WE HAD THE ACFT VISUALLY IN SIGHT. WE WERE THEN GIVEN A TURN FROM A 090 DEG HDG TO A 270 DEG HDG. WE WERE THEN GIVEN A CLRNC TO CLB UP TO 5000 FT. AFTER TAKING US OUT OF THE STREAM OF TFC INTO RWY 1L INTO IAD, WE WERE THEN VECTORED TO A VISUAL PATTERN FOR RWY 1L WITHOUT FURTHER INCIDENT.
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.