An air carrier jet climbs on a TCASII RA to avoid a non reported aircraft climbing to his altitude.

Attributes
ACN	434491
Time
Date	199904
Day	Mon
Local Time Of Day	1201 To 1800
Place
State Reference	GA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax.tracon tower : bil.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : enroute altitude change
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 220 flight time total : 10000 flight time type : 220
ASRS Report	434491
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 50 vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII gave alert for traffic 12 O'clock, level 300 ft below converging. When the distance got within preset limits, the TCASII commanded 'climb.' we climbed to 11000 ft, called jax approach and informed him, and made an uneventful landing.

Original NASA ASRS Text

Title: AN ACR JET CLBS ON A TCASII RA TO AVOID A NON RPTED ACFT CLBING TO HIS ALT.

Narrative: TCASII GAVE ALERT FOR TFC 12 O'CLOCK, LEVEL 300 FT BELOW CONVERGING. WHEN THE DISTANCE GOT WITHIN PRESET LIMITS, THE TCASII COMMANDED 'CLB.' WE CLBED TO 11000 FT, CALLED JAX APCH AND INFORMED HIM, AND MADE AN UNEVENTFUL LNDG.

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.