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MD80 and DH8 were directed to cross each other's track at sea while aligning for runways 16L&right. This resulted in a TCASII RA.
| Attributes | |
| ACN | 457857 |
| Time | |
| Date | 199912 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 16r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival star : husky visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 16l |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 5000 |
| ASRS Report | 457857 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance Airport FAA |
| Primary Problem | ATC Human Performance |
| Situations | |
| ATC Facility | procedure or policy : s46.tracon |
Narrative:
Aircraft #1 on husky visual runway 16R #2 inbound from northwest for runway 16L. Both aircraft at 3000 ft. Both aircraft flight paths crossed causing aircraft #1 to get a TCASII RA event 'descend.' this could have been avoided if aircraft #1 was given visual runway 16L and #2 runway 16R. This scenario is a common scenario at seatac international.
Original NASA ASRS Text
Title: MD80 AND DH8 WERE DIRECTED TO CROSS EACH OTHER'S TRACK AT SEA WHILE ALIGNING FOR RWYS 16L&R. THIS RESULTED IN A TCASII RA.
Narrative: ACFT #1 ON HUSKY VISUAL RWY 16R #2 INBOUND FROM NW FOR RWY 16L. BOTH ACFT AT 3000 FT. BOTH ACFT FLT PATHS CROSSED CAUSING ACFT #1 TO GET A TCASII RA EVENT 'DSND.' THIS COULD HAVE BEEN AVOIDED IF ACFT #1 WAS GIVEN VISUAL RWY 16L AND #2 RWY 16R. THIS SCENARIO IS A COMMON SCENARIO AT SEATAC INTL.
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.