Reported TCASII RA climb to avoid traffic while on an IMC approach to dfw.

Attributes
ACN	395852
Time
Date	199803
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	395852
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	396006
Events
Anomaly	non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 10200 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Approaching bossie intersection inbound during IMC approach received RA to climb. Targets on TCASII merged. Passenger reported aircraft passed underneath us. After climb, completed another approach to landing. WX was 100 overcast and 1 mi visibility. Callback conversation with reporter revealed the following information: both aircraft were at 5000 ft in IMC conditions. Reporter called the facility and was told it was an operational error with quoted separation of 100 ft and 1.7 mi separation. Reporter reiterated that the passenger saw the aircraft pass under their aircraft during the climb. They were on the tower frequency and after climbing received instructions by the local controller to turn immediately to the right reference the traffic which by then they had climbed to 5500 ft and had broken out of the clouds.

Original NASA ASRS Text

Title: RPTED TCASII RA CLB TO AVOID TFC WHILE ON AN IMC APCH TO DFW.

Narrative: APCHING BOSSIE INTXN INBOUND DURING IMC APCH RECEIVED RA TO CLB. TARGETS ON TCASII MERGED. PAX RPTED ACFT PASSED UNDERNEATH US. AFTER CLB, COMPLETED ANOTHER APCH TO LNDG. WX WAS 100 OVCST AND 1 MI VISIBILITY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: BOTH ACFT WERE AT 5000 FT IN IMC CONDITIONS. RPTR CALLED THE FACILITY AND WAS TOLD IT WAS AN OPERROR WITH QUOTED SEPARATION OF 100 FT AND 1.7 MI SEPARATION. RPTR REITERATED THAT THE PAX SAW THE ACFT PASS UNDER THEIR ACFT DURING THE CLB. THEY WERE ON THE TWR FREQ AND AFTER CLBING RECEIVED INSTRUCTIONS BY THE LCL CTLR TO TURN IMMEDIATELY TO THE R REF THE TFC WHICH BY THEN THEY HAD CLBED TO 5500 FT AND HAD BROKEN OUT OF THE CLOUDS.

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.