Flight crew of an medium large transport climbed in response to a TCASII RA during descent. ATC had given a TA, but the flight crew had not observed the climbing traffic before the RA warning.

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Attributes
ACN	330834
Time
Date	199603
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sli airport : sna
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 3500
ASRS Report	330834
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 200 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

The TCASII signaled an aircraft less than 5 mi away and below us climbing. The TCASII then gave us a red conflict warning and a message to climb, which we did. Approach control then told us of the traffic and to descend to 5000 ft. We informed approach control we were climbing to avoid the traffic. I did get a visual on the traffic which was clearly on a collision course had we not started a climb and the other traffic started a right turn. I feel the TCASII system certainly helped prevent a disaster.

Original NASA ASRS Text

Title: FLC OF AN MLG CLBED IN RESPONSE TO A TCASII RA DURING DSCNT. ATC HAD GIVEN A TA, BUT THE FLC HAD NOT OBSERVED THE CLBING TFC BEFORE THE RA WARNING.

Narrative: THE TCASII SIGNALED AN ACFT LESS THAN 5 MI AWAY AND BELOW US CLBING. THE TCASII THEN GAVE US A RED CONFLICT WARNING AND A MESSAGE TO CLB, WHICH WE DID. APCH CTL THEN TOLD US OF THE TFC AND TO DSND TO 5000 FT. WE INFORMED APCH CTL WE WERE CLBING TO AVOID THE TFC. I DID GET A VISUAL ON THE TFC WHICH WAS CLRLY ON A COLLISION COURSE HAD WE NOT STARTED A CLB AND THE OTHER TFC STARTED A R TURN. I FEEL THE TCASII SYS CERTAINLY HELPED PREVENT A DISASTER.

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.