Air carrier on descent for approach receives TCAS ii RA, responds with climb.

Attributes
ACN	173814
Time
Date	199103
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bal
State Reference	MD
Altitude	msl bound lower : 4000 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5700
ASRS Report	173814
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 9000
ASRS Report	173697
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Bwi approach control was vectoring us for the bwi airport. We were cleared to descend from 6000' to 4000'. During descent TCAS issued a TA, traffic was at 12 O'clock below us. This was followed by a RA of a climb at a rate of 1200-1500 FPM and ATC instructed us to turn right 40 degree immediately. During climb we advised ATC we were following a resolution and their instructions for the right turn. RA ceased, TCAS announced clear of conflict we resumed descent and turned back to original heading.

Original NASA ASRS Text

Title: ACR ON DESCENT FOR APCH RECEIVES TCAS II RA, RESPONDS WITH CLIMB.

Narrative: BWI APCH CTL WAS VECTORING US FOR THE BWI ARPT. WE WERE CLRED TO DSND FROM 6000' TO 4000'. DURING DSNT TCAS ISSUED A TA, TFC WAS AT 12 O'CLOCK BELOW US. THIS WAS FOLLOWED BY A RA OF A CLB AT A RATE OF 1200-1500 FPM AND ATC INSTRUCTED US TO TURN R 40 DEG IMMEDIATELY. DURING CLB WE ADVISED ATC WE WERE FOLLOWING A RESOLUTION AND THEIR INSTRUCTIONS FOR THE R TURN. RA CEASED, TCAS ANNOUNCED CLR OF CONFLICT WE RESUMED DSNT AND TURNED BACK TO ORIGINAL HDG.

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.