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Iad controller does not ensure separation between carj, cleared for visual approach and a B737 inbound on localizer.
| Attributes | |
| ACN | 448234 |
| Time | |
| Date | 199909 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : aml.vortac |
| State Reference | VA |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : iad.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| 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 limited radar : 2 controller non radar : 2 controller radar : 6 flight time total : 80 |
| ASRS Report | 448234 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X cleared for a visual approach from the downwind didn't turn base or descend for at least 5 mi. B737 air carrier Y on a straight-in approach level at 4000 ft, established on localizer, wouldn't slow -- had to be vectored off of the localizer. Loss of separation occurred while air carrier Y B737 was turning.
Original NASA ASRS Text
Title: IAD CTLR DOES NOT ENSURE SEPARATION BTWN CARJ, CLRED FOR VISUAL APCH AND A B737 INBOUND ON LOC.
Narrative: ACR X CLRED FOR A VISUAL APCH FROM THE DOWNWIND DIDN'T TURN BASE OR DSND FOR AT LEAST 5 MI. B737 ACR Y ON A STRAIGHT-IN APCH LEVEL AT 4000 FT, ESTABLISHED ON LOC, WOULDN'T SLOW -- HAD TO BE VECTORED OFF OF THE LOC. LOSS OF SEPARATION OCCURRED WHILE ACR Y B737 WAS TURNING.
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.