B737 departure from dfw experienced TCAS RA with unreported VFR traffic at approximately 3000'.

Attributes
ACN	748042
Time
Date	200707
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : d10.tracon
State Reference	TX
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Route In Use	departure sid : bach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Make Model Name	MU-2 Undifferentiated or Other Model
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 188 flight time type : 6000
ASRS Report	748042
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

WX: night VMC with patchy clouds at 3000 ft MSL. We were cleared the bachman 5 departure to 5000 ft MSL. As we turned to intercept the cve 139 degree radial climbing through 3000 ft MSL; we received a TCAS; 'monitor vertical speed;' rapidly followed by a 'descend; descend' RA. The first officer then noticed an anti-collision beacon at 1 O'clock position. I complied with the RA as departure control directed a 30 degree left turn and a further climb. Departure control then informed us of 'VFR mitsubishi at 3500 ft.' soon after we received the TCAS 'clear of conflict' audio and I continued the climb and heading directed by ATC. We told departure control we had received an RA. At no time was collision imminent. ATC might identify the traffic conflict earlier and not clear one aircraft through the altitude of another aircraft.

Original NASA ASRS Text

Title: B737 DEP FROM DFW EXPERIENCED TCAS RA WITH UNREPORTED VFR TFC AT APPROX 3000'.

Narrative: WX: NIGHT VMC WITH PATCHY CLOUDS AT 3000 FT MSL. WE WERE CLRED THE BACHMAN 5 DEP TO 5000 FT MSL. AS WE TURNED TO INTERCEPT THE CVE 139 DEG RADIAL CLBING THROUGH 3000 FT MSL; WE RECEIVED A TCAS; 'MONITOR VERT SPD;' RAPIDLY FOLLOWED BY A 'DSND; DSND' RA. THE FO THEN NOTICED AN ANTI-COLLISION BEACON AT 1 O'CLOCK POS. I COMPLIED WITH THE RA AS DEP CTL DIRECTED A 30 DEG L TURN AND A FURTHER CLB. DEP CTL THEN INFORMED US OF 'VFR MITSUBISHI AT 3500 FT.' SOON AFTER WE RECEIVED THE TCAS 'CLR OF CONFLICT' AUDIO AND I CONTINUED THE CLB AND HDG DIRECTED BY ATC. WE TOLD DEP CTL WE HAD RECEIVED AN RA. AT NO TIME WAS COLLISION IMMINENT. ATC MIGHT IDENT THE TFC CONFLICT EARLIER AND NOT CLR ONE ACFT THROUGH THE ALT OF ANOTHER ACFT.

Data retrieved from NASA's ASRS site as of January 2009 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.