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Medium large transport flight crew cleared to descend from 3 to 2000 saw small aircraft traffic at 2500, leveled and avoided small aircraft. Small aircraft allegedly not on controller scope.
| Attributes | |
| ACN | 183527 |
| Time | |
| Date | 199107 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : aml |
| State Reference | VA |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad tower : pbi |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 1000 |
| ASRS Report | 183527 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 4000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On a 10 NM east downwind 3000 ft for runway 1R at iad, controller issued 270 degree radial descend to 2000 ft. We advised unable due to low wing 4 seater GA aircraft at our 2 O'clock position less than 1 mi about 2500 ft. If we had complied we would have collided. The controller said he did not have this traffic. At 2500 ft and 10 NM from dulles, I find this hard to believe. The controller was rattling clrncs that were mumbled and very fast. This causing a lot of confusion and increasing his workload by many repeats. Also not allowing time to evaluate his traffic area. This facility has only 11 full controllers at a very busy hub. The workload really shows up, i.e., no changeover of radio frequency, altitudes, speeds. When traffic is light it runs smoothly. Not the case with the hub times.
Original NASA ASRS Text
Title: MLG FLC CLRED TO DSND FROM 3 TO 2000 SAW SMA TFC AT 2500, LEVELED AND AVOIDED SMA. SMA ALLEGEDLY NOT ON CTLR SCOPE.
Narrative: ON A 10 NM E DOWNWIND 3000 FT FOR RWY 1R AT IAD, CTLR ISSUED 270 DEG RADIAL DSND TO 2000 FT. WE ADVISED UNABLE DUE TO LOW WING 4 SEATER GA ACFT AT OUR 2 O'CLOCK POS LESS THAN 1 MI ABOUT 2500 FT. IF WE HAD COMPLIED WE WOULD HAVE COLLIDED. THE CTLR SAID HE DID NOT HAVE THIS TFC. AT 2500 FT AND 10 NM FROM DULLES, I FIND THIS HARD TO BELIEVE. THE CTLR WAS RATTLING CLRNCS THAT WERE MUMBLED AND VERY FAST. THIS CAUSING A LOT OF CONFUSION AND INCREASING HIS WORKLOAD BY MANY REPEATS. ALSO NOT ALLOWING TIME TO EVALUATE HIS TFC AREA. THIS FACILITY HAS ONLY 11 FULL CTLRS AT A VERY BUSY HUB. THE WORKLOAD REALLY SHOWS UP, I.E., NO CHANGEOVER OF RADIO FREQ, ALTS, SPEEDS. WHEN TFC IS LIGHT IT RUNS SMOOTHLY. NOT THE CASE WITH THE HUB TIMES.
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.