B727 in class B airspace received and acted on TCASII RA to avoid traffic also in class B airspace.

Attributes
ACN	442119
Time
Date	199907
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl bound lower : 5500 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : m98.tracon
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 250 flight time total : 7000 flight time type : 300
ASRS Report	422119
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Events
Anomaly	conflict : airborne critical conflict : nmac non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other controllera
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action
Miss Distance	horizontal : 50 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We leveled at 6000 ft wbound out of msp when departure called light aircraft traffic to us at 12 O'clock, 3 mi, and 6500 ft. We saw the traffic about the same time we got a TA, closely followed by an RA with a TCASII command to descend. The captain followed the command and we descended to approximately 5500 ft. We advised ATC then climbed back to 6000 ft when clear of conflict. More of a heads up from ATC would have helped in this situation. The TCASII system performed well and increased separation distance in a timely fashion.

Original NASA ASRS Text

Title: B727 IN CLASS B AIRSPACE RECEIVED AND ACTED ON TCASII RA TO AVOID TFC ALSO IN CLASS B AIRSPACE.

Narrative: WE LEVELED AT 6000 FT WBOUND OUT OF MSP WHEN DEP CALLED LIGHT ACFT TFC TO US AT 12 O'CLOCK, 3 MI, AND 6500 FT. WE SAW THE TFC ABOUT THE SAME TIME WE GOT A TA, CLOSELY FOLLOWED BY AN RA WITH A TCASII COMMAND TO DSND. THE CAPT FOLLOWED THE COMMAND AND WE DSNDED TO APPROX 5500 FT. WE ADVISED ATC THEN CLBED BACK TO 6000 FT WHEN CLR OF CONFLICT. MORE OF A HEADS UP FROM ATC WOULD HAVE HELPED IN THIS SIT. THE TCASII SYS PERFORMED WELL AND INCREASED SEPARATION DISTANCE IN A TIMELY FASHION.

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.