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.

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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.