Air carrier at level flight initiated a climb due to TCASII alarm for traffic below.

Attributes
ACN	199817
Time
Date	199201
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 2000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 10
ASRS Report	199817
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII climb executed by air carrier medium large transport X level at 3000 ft when he started his climb because of a departure off ads airport (small transport Y). Departure was at 2000 ft and courses were diverging.

Original NASA ASRS Text

Title: ACR AT LEVEL FLT INITIATED A CLB DUE TO TCASII ALARM FOR TFC BELOW.

Narrative: TCASII CLB EXECUTED BY ACR MLG X LEVEL AT 3000 FT WHEN HE STARTED HIS CLB BECAUSE OF A DEP OFF ADS ARPT (SMT Y). DEP WAS AT 2000 FT AND COURSES WERE DIVERGING.

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.