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Potential near midair collision when ATCT local controller allows a visual separation clearance clause during a simultaneous parallel approach to runways 16R&left at sea, wa.
| Attributes | |
| ACN | 612358 |
| Time | |
| Date | 200403 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 1000 |
| Environment | |
| Flight Conditions | Marginal |
| Weather Elements | Rain Fog |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sea.tower tower : cle.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 16r |
| Flight Phase | descent : approach landing : go around |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : sea.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 612358 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical inflight encounter : weather non adherence : published procedure non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : executed go around flight crew : took evasive action other |
| Miss Distance | horizontal : 600 vertical : 0 |
| Supplementary | |
| Problem Areas | Airport Flight Crew Human Performance Navigational Facility ATC Human Performance |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation other |
| Situations | |
| ATC Facility | procedure or policy : sea.tower |
Narrative:
Near midair collision. While on approach to runway 16R, IMC with moderate rain, commuter aircraft cleared for a visual approach to runway 16L. He was instructed to maintain visual separation from us and to maintain 170 KTS. These are close runways, ie, no parallel approachs. We got 2 TA's. At about 1000 ft we got an RA to climb. I looked out my left window, and the commuter aircraft was on my wingtip. I saw him through the rain and IMC. ATC asked him his speed, and he said 190 KTS. We responded to RA and went around. It was very close. This incident was caused by other aircraft not maintaining proper speed, visual clearance, and trying to be VFR in IMC.
Original NASA ASRS Text
Title: POTENTIAL NMAC WHEN ATCT LCL CTLR ALLOWS A VISUAL SEPARATION CLRNC CLAUSE DURING A SIMULTANEOUS PARALLEL APCH TO RWYS 16R&L AT SEA, WA.
Narrative: NMAC. WHILE ON APCH TO RWY 16R, IMC WITH MODERATE RAIN, COMMUTER ACFT CLRED FOR A VISUAL APCH TO RWY 16L. HE WAS INSTRUCTED TO MAINTAIN VISUAL SEPARATION FROM US AND TO MAINTAIN 170 KTS. THESE ARE CLOSE RWYS, IE, NO PARALLEL APCHS. WE GOT 2 TA'S. AT ABOUT 1000 FT WE GOT AN RA TO CLB. I LOOKED OUT MY L WINDOW, AND THE COMMUTER ACFT WAS ON MY WINGTIP. I SAW HIM THROUGH THE RAIN AND IMC. ATC ASKED HIM HIS SPD, AND HE SAID 190 KTS. WE RESPONDED TO RA AND WENT AROUND. IT WAS VERY CLOSE. THIS INCIDENT WAS CAUSED BY OTHER ACFT NOT MAINTAINING PROPER SPD, VISUAL CLRNC, AND TRYING TO BE VFR IN IMC.
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.