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Less than standard separation occurs on a visual final approach as aircraft Y overshoots turn to intercept. Aircraft X on parallel runway approach and turns to provide extra separation.
| Attributes | |
| ACN | 134287 |
| Time | |
| Date | 199001 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 1900 msl bound upper : 1900 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea tower : sea |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 16850 flight time type : 4350 |
| ASRS Report | 134287 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 500 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was flying as captain on air carrier flight X (an medium large transport aircraft) making an ILS approach to runway 16R at sea under VFR conditions. I was advised by sea approach control that another aircraft, air carrier flight Y, an mdt, had me in sight and would be making a visibility approach to runway 16L and that he may pass me on approach. My first officer noticed the other aircraft at approximately our 9:30 position and that his course to intercept the runway 16L extension seemed excessive. As he pulled abeam of my aircraft, he appeared to overshoot the extended centerline for runway 16L and that he might overrun into the ILS course for runway 16R. I moved my aircraft to the right of the ILS localizer course to avoid any further conflict. The other aircraft had his right wing up and would probably be unable to maintain visibility sep with us. This occurred in the vicinity of parkk OM (5.8 DME of 1521 ILS). Both aircraft landed normally on their assigned runways. I advised sea tower that the overshoot was 'a little too close.'
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION OCCURS ON A VISUAL FINAL APCH AS ACFT Y OVERSHOOTS TURN TO INTERCEPT. ACFT X ON PARALLEL RWY APCH AND TURNS TO PROVIDE EXTRA SEPARATION.
Narrative: I WAS FLYING AS CAPT ON ACR FLT X (AN MLG ACFT) MAKING AN ILS APCH TO RWY 16R AT SEA UNDER VFR CONDITIONS. I WAS ADVISED BY SEA APCH CTL THAT ANOTHER ACFT, ACR FLT Y, AN MDT, HAD ME IN SIGHT AND WOULD BE MAKING A VIS APCH TO RWY 16L AND THAT HE MAY PASS ME ON APCH. MY F/O NOTICED THE OTHER ACFT AT APPROX OUR 9:30 POS AND THAT HIS COURSE TO INTERCEPT THE RWY 16L EXTENSION SEEMED EXCESSIVE. AS HE PULLED ABEAM OF MY ACFT, HE APPEARED TO OVERSHOOT THE EXTENDED CENTERLINE FOR RWY 16L AND THAT HE MIGHT OVERRUN INTO THE ILS COURSE FOR RWY 16R. I MOVED MY ACFT TO THE RIGHT OF THE ILS LOC COURSE TO AVOID ANY FURTHER CONFLICT. THE OTHER ACFT HAD HIS RIGHT WING UP AND WOULD PROBABLY BE UNABLE TO MAINTAIN VIS SEP WITH US. THIS OCCURRED IN THE VICINITY OF PARKK OM (5.8 DME OF 1521 ILS). BOTH ACFT LANDED NORMALLY ON THEIR ASSIGNED RWYS. I ADVISED SEA TWR THAT THE OVERSHOOT WAS 'A LITTLE TOO CLOSE.'
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.