TCASII TA aircraft sighted commenced turn and stopped climb. RA occurred descend. Controller said it...

Attributes
ACN	279186
Time
Date	199408
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	msl bound lower : 11500 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea artcc : zny
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	279186
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At XL10 on the sea 068 degree radial at approximately 15 DME sea departure on 119.20 received a frequency change. Before the change could be initiated received TCASII TA target was at 12 O'clock approximately 5 mi 500 ft above us. We were climbing through approximately 11-500 ft. Visual contact made. Climb stopped and left turn initiated to avoid traffic. At same time visual contact made and action taken -- the TA changed to an RA with descend. Controller said traffic had just popped up. Target passed off our right approximately 1-2 mi.

Original NASA ASRS Text

Title: TCASII TA ACFT SIGHTED COMMENCED TURN AND STOPPED CLB. RA OCCURRED DSND. CTLR SAID IT WAS A POP-UP.

Narrative: AT XL10 ON THE SEA 068 DEG RADIAL AT APPROX 15 DME SEA DEP ON 119.20 RECEIVED A FREQ CHANGE. BEFORE THE CHANGE COULD BE INITIATED RECEIVED TCASII TA TARGET WAS AT 12 O'CLOCK APPROX 5 MI 500 FT ABOVE US. WE WERE CLBING THROUGH APPROX 11-500 FT. VISUAL CONTACT MADE. CLB STOPPED AND L TURN INITIATED TO AVOID TFC. AT SAME TIME VISUAL CONTACT MADE AND ACTION TAKEN -- THE TA CHANGED TO AN RA WITH DSND. CTLR SAID TFC HAD JUST POPPED UP. TARGET PASSED OFF OUR R APPROX 1-2 MI.

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.

TCASII TA aircraft sighted commenced turn and stopped climb. RA occurred descend. Controller said it was a pop-up.