TCASII RA causes evasive action by large transport to avoid small aircraft.

Attributes
ACN	224612
Time
Date	199210
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zab
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 7000
ASRS Report	224612
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 6200 flight time type : 1100
ASRS Report	224648
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

We were descending into phx on the totec 7 arrival. We had been cleared to 11000 ft. As we were passing approximately 12000 ft we got a TA on our TCASII. Our scope was set on the 10 mi scale. Traffic showed up on the screen at our 12 O'clock position inside the 5 mi range ring. The scope showed him 800 ft below us and climbing. The TCASII immediately went to 'RA' with a climb indicated in excess of 2000 FPM. My first officer sighted the other aircraft and called the traffic. When I saw the other aircraft he was just about level with us at a range of about 1-2 mi. I continued my climb and went into a right turn. We passed approximately 1 mi or less behind the other aircraft. We told abq center what we had done and he then told us he showed traffic at our 11 O'clock position at 2 mi. We continued the flight to phx without further incident. Supplemental information from acn 224648. We had just descended through a cloud/haze layer, with visibility improving.

Original NASA ASRS Text

Title: TCASII RA CAUSES EVASIVE ACTION BY LGT TO AVOID SMA.

Narrative: WE WERE DSNDING INTO PHX ON THE TOTEC 7 ARR. WE HAD BEEN CLRED TO 11000 FT. AS WE WERE PASSING APPROX 12000 FT WE GOT A TA ON OUR TCASII. OUR SCOPE WAS SET ON THE 10 MI SCALE. TFC SHOWED UP ON THE SCREEN AT OUR 12 O'CLOCK POS INSIDE THE 5 MI RANGE RING. THE SCOPE SHOWED HIM 800 FT BELOW US AND CLBING. THE TCASII IMMEDIATELY WENT TO 'RA' WITH A CLB INDICATED IN EXCESS OF 2000 FPM. MY FO SIGHTED THE OTHER ACFT AND CALLED THE TFC. WHEN I SAW THE OTHER ACFT HE WAS JUST ABOUT LEVEL WITH US AT A RANGE OF ABOUT 1-2 MI. I CONTINUED MY CLB AND WENT INTO A R TURN. WE PASSED APPROX 1 MI OR LESS BEHIND THE OTHER ACFT. WE TOLD ABQ CTR WHAT WE HAD DONE AND HE THEN TOLD US HE SHOWED TFC AT OUR 11 O'CLOCK POS AT 2 MI. WE CONTINUED THE FLT TO PHX WITHOUT FURTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 224648. WE HAD JUST DSNDED THROUGH A CLOUD/HAZE LAYER, WITH VISIBILITY IMPROVING.

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.