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Iad local controller described conflict event at 1700 ft between runway 19C and 19L arrs; alleging tailwind component was contributory.
| Attributes | |
| ACN | 792205 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iad.airport |
| State Reference | VA |
| Altitude | msl single value : 1700 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : iad.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 19l |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : iad.tower |
| Operator | common carrier : air taxi |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 19c |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller limited radar : 17 controller military : 4 controller radar : 14 |
| ASRS Report | 792205 |
| Events | |
| Anomaly | conflict : airborne critical inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Problem Areas | Environmental Factor Weather Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Iad was in a south operation with thunderstorms in the vicinity. Surface winds were out of the north and northwest. At one point; I observed winds 330 degrees at 10 KTS. I informed the supervisor that we should probably turn the operation to a north confign. I was told that we have a lot of arrs and that we would remain south. The tailwind component was a big part of why the aircraft got so close. The DH8 was on approach to runway 19C when due to thunderstorms and tailwinds he went east of his final approach course and entered the final approach course for runway 19L. An airbus 320 was on approach to runway 19L. I observed both aircraft at 1700 ft MSL and targets merged. I told the A320 about the traffic and then climbed him and coordination a go around.
Original NASA ASRS Text
Title: IAD LCL CTLR DESCRIBED CONFLICT EVENT AT 1700 FT BETWEEN RWY 19C AND 19L ARRS; ALLEGING TAILWIND COMPONENT WAS CONTRIBUTORY.
Narrative: IAD WAS IN A S OP WITH TSTMS IN THE VICINITY. SURFACE WINDS WERE OUT OF THE N AND NW. AT ONE POINT; I OBSERVED WINDS 330 DEGS AT 10 KTS. I INFORMED THE SUPVR THAT WE SHOULD PROBABLY TURN THE OP TO A N CONFIGN. I WAS TOLD THAT WE HAVE A LOT OF ARRS AND THAT WE WOULD REMAIN S. THE TAILWIND COMPONENT WAS A BIG PART OF WHY THE ACFT GOT SO CLOSE. THE DH8 WAS ON APCH TO RWY 19C WHEN DUE TO TSTMS AND TAILWINDS HE WENT E OF HIS FINAL APCH COURSE AND ENTERED THE FINAL APCH COURSE FOR RWY 19L. AN AIRBUS 320 WAS ON APCH TO RWY 19L. I OBSERVED BOTH ACFT AT 1700 FT MSL AND TARGETS MERGED. I TOLD THE A320 ABOUT THE TFC AND THEN CLBED HIM AND COORD A GAR.
Data retrieved from NASA's ASRS site as of May 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.