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Pct controller experienced operational error at 4000 ft during vectors for iad final when one aircraft descended at a slow rate and separation was lost.
| Attributes | |
| ACN | 705717 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iad.airport |
| State Reference | VA |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | general aviation : personal |
| Make Model Name | Baron 55/Cochise |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer & glide slope : 1l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 1l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 8 controller radar : 13 |
| ASRS Report | 705717 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert flight crew : took evasive action |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
A loss of standard separation was lost between air carrier Y (A320) and aircraft X (BE55) both being vectored for an ILS approach to runway 1L at iad. Though turned and descended; air carrier Y turn and descent rate were much less than standard. Aircraft X was vectored off the localizer prior to air carrier Y being turned on the base. Again; though air carrier Y was instructed to expedite the descent; the turn rate and descent rate resulted in a loss of separation. Traffic was exchanged between both prior to the loss.
Original NASA ASRS Text
Title: PCT CTLR EXPERIENCED OPERROR AT 4000 FT DURING VECTORS FOR IAD FINAL WHEN ONE ACFT DSNDED AT A SLOW RATE AND SEPARATION WAS LOST.
Narrative: A LOSS OF STANDARD SEPARATION WAS LOST BTWN ACR Y (A320) AND ACFT X (BE55) BOTH BEING VECTORED FOR AN ILS APCH TO RWY 1L AT IAD. THOUGH TURNED AND DSNDED; ACR Y TURN AND DSCNT RATE WERE MUCH LESS THAN STANDARD. ACFT X WAS VECTORED OFF THE LOC PRIOR TO ACR Y BEING TURNED ON THE BASE. AGAIN; THOUGH ACR Y WAS INSTRUCTED TO EXPEDITE THE DSCNT; THE TURN RATE AND DSCNT RATE RESULTED IN A LOSS OF SEPARATION. TFC WAS EXCHANGED BTWN BOTH PRIOR TO THE LOSS.
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.