Air carrier took evasive action because of TCASII RA.

Attributes
ACN	447138
Time
Date	199908
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : phx.vortac
State Reference	AZ
Altitude	msl bound lower : 12000 msl bound upper : 12700
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab.artcc
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 150 flight time total : 11000 flight time type : 700
ASRS Report	447138
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action
Miss Distance	horizontal : 400 vertical : 400
Supplementary
Problem Areas	Airspace Structure
Primary Problem	Airspace Structure

Narrative:

We were en route between tus and phx when we received a TCASII RA and the command to climb. We immediately climbed to miss traffic beneath us. At 12700 ft we topped out and once clear returned to 12000 ft and advised ATC.

Original NASA ASRS Text

Title: ACR TOOK EVASIVE ACTION BECAUSE OF TCASII RA.

Narrative: WE WERE ENRTE BTWN TUS AND PHX WHEN WE RECEIVED A TCASII RA AND THE COMMAND TO CLB. WE IMMEDIATELY CLBED TO MISS TFC BENEATH US. AT 12700 FT WE TOPPED OUT AND ONCE CLR RETURNED TO 12000 FT AND ADVISED ATC.

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.