Potential conflict in TCA.

Attributes
ACN	203209
Time
Date	199202
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	msl bound lower : 3000 msl bound upper : 3300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent : approach
Route In Use	arrival other arrival star : star enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : flight engineer
ASRS Report	203209
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 15000
ASRS Report	203378
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 2500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Flying olympia 1 arrival at seatac airport we departed fourt heading 340 degree cleared to 3000 ft. We leveled at 3000 ft with no approach clearance. At approximately 10 DME approach asked us if we were making our turn? We started a turn and confirmed clearance for the bay visual 16L. Behind us an light transport air carrier Y was cleared for the bay visual 16L and confirmed he had us in sight. Air carrier Y now turns inside our flight path. Air carrier Y is now inside our turn, below us, faster on a collision course and we do not have air carrier Y in sight. TCASII then transmits a RA to climb which we complied with. After climbing to 3300 ft, we align ourselves with the GS, talk to approach, and comply with a second TCASII RA. Approach now realizes the problem and issues clearance for both aircraft to switch runways. I am not sure light transport ever saw us, he passed 2-3000 ft ahead and 500 ft below us. Supplemental information from acn 203362. This approach was lackadaisical at best. Laziness and inattentiveness on the part of approach. Why cross 2 planes on a localizer?

Original NASA ASRS Text

Title: POTENTIAL CONFLICT IN TCA.

Narrative: FLYING OLYMPIA 1 ARR AT SEATAC ARPT WE DEPARTED FOURT HDG 340 DEG CLRED TO 3000 FT. WE LEVELED AT 3000 FT WITH NO APCH CLRNC. AT APPROX 10 DME APCH ASKED US IF WE WERE MAKING OUR TURN? WE STARTED A TURN AND CONFIRMED CLRNC FOR THE BAY VISUAL 16L. BEHIND US AN LTT ACR Y WAS CLRED FOR THE BAY VISUAL 16L AND CONFIRMED HE HAD US IN SIGHT. ACR Y NOW TURNS INSIDE OUR FLT PATH. ACR Y IS NOW INSIDE OUR TURN, BELOW US, FASTER ON A COLLISION COURSE AND WE DO NOT HAVE ACR Y IN SIGHT. TCASII THEN XMITS A RA TO CLB WHICH WE COMPLIED WITH. AFTER CLBING TO 3300 FT, WE ALIGN OURSELVES WITH THE GS, TALK TO APCH, AND COMPLY WITH A SECOND TCASII RA. APCH NOW REALIZES THE PROBLEM AND ISSUES CLRNC FOR BOTH ACFT TO SWITCH RWYS. I AM NOT SURE LTT EVER SAW US, HE PASSED 2-3000 FT AHEAD AND 500 FT BELOW US. SUPPLEMENTAL INFO FROM ACN 203362. THIS APCH WAS LACKADAISICAL AT BEST. LAZINESS AND INATTENTIVENESS ON THE PART OF APCH. WHY CROSS 2 PLANES ON A LOC?

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.