An air carrier gets a TCASII 'RA' from a GA aircraft operating below the class 'B' airspace and climbs 250 ft to afford adequate separation.

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Attributes
ACN	323179
Time
Date	199512
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cve airport : dfw
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 3250
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 17000 flight time type : 14000
ASRS Report	323179
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4500 flight time type : 1300
ASRS Report	323175
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

While being controled by dallas regional approach control at 3000 ft assigned, traffic was issued by controller at 12 O'clock at 2500 ft. At this time the TCASII reported 'traffic, traffic' and highlighted the target on the vsi. It displayed 2500 ft with an up arrow. The target then displayed 2600 ft and 2700 ft climbing. The TCASII then issued a RA of 'climb, climb' which we followed since we had no visual contact and were IMC. We climbed to 3250 ft and then the TCASII issued monitor 'vertical speed.' the conflicting target then displayed 2500 ft. We advised the controller that we were responding to TCASII RA and also, when we returned to assigned altitude of 3000 ft. Supplemental information from acn 323175: in this area, it is common for GA aircraft to fly right at the lower limit of the class B airspace. Airliners are also assigned these altitudes by ATC as they approach the airport. TCASII RA's are very common as a result.

Original NASA ASRS Text

Title: AN ACR GETS A TCASII 'RA' FROM A GA ACFT OPERATING BELOW THE CLASS 'B' AIRSPACE AND CLBS 250 FT TO AFFORD ADEQUATE SEPARATION.

Narrative: WHILE BEING CTLED BY DALLAS REGIONAL APCH CTL AT 3000 FT ASSIGNED, TFC WAS ISSUED BY CTLR AT 12 O'CLOCK AT 2500 FT. AT THIS TIME THE TCASII RPTED 'TFC, TFC' AND HIGHLIGHTED THE TARGET ON THE VSI. IT DISPLAYED 2500 FT WITH AN UP ARROW. THE TARGET THEN DISPLAYED 2600 FT AND 2700 FT CLBING. THE TCASII THEN ISSUED A RA OF 'CLB, CLB' WHICH WE FOLLOWED SINCE WE HAD NO VISUAL CONTACT AND WERE IMC. WE CLBED TO 3250 FT AND THEN THE TCASII ISSUED MONITOR 'VERT SPD.' THE CONFLICTING TARGET THEN DISPLAYED 2500 FT. WE ADVISED THE CTLR THAT WE WERE RESPONDING TO TCASII RA AND ALSO, WHEN WE RETURNED TO ASSIGNED ALT OF 3000 FT. SUPPLEMENTAL INFO FROM ACN 323175: IN THIS AREA, IT IS COMMON FOR GA ACFT TO FLY RIGHT AT THE LOWER LIMIT OF THE CLASS B AIRSPACE. AIRLINERS ARE ALSO ASSIGNED THESE ALTS BY ATC AS THEY APCH THE ARPT. TCASII RA'S ARE VERY COMMON AS A RESULT.

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.