Medium large transport has TCASII RA during descent while being vectored.

Attributes
ACN	243329
Time
Date	199306
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bwi
State Reference	MD
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 4000
ASRS Report	243329
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe inflight encounter : weather
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1500
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

While being vectored for approach a TCASII RA warning went off advising us to climb to avoid another aircraft. We initiated the climb and avoided aircraft by at least 1500 ft. Prior to the warning we received numerous heading changes by approach control. We changed frequencys between the 2 approach controls many times. We were also required to request some deviation during the time preceding the warning due to thunderstorms.

Original NASA ASRS Text

Title: MLG HAS TCASII RA DURING DSCNT WHILE BEING VECTORED.

Narrative: WHILE BEING VECTORED FOR APCH A TCASII RA WARNING WENT OFF ADVISING US TO CLB TO AVOID ANOTHER ACFT. WE INITIATED THE CLB AND AVOIDED ACFT BY AT LEAST 1500 FT. PRIOR TO THE WARNING WE RECEIVED NUMEROUS HDG CHANGES BY APCH CTL. WE CHANGED FREQS BTWN THE 2 APCH CTLS MANY TIMES. WE WERE ALSO REQUIRED TO REQUEST SOME DEV DURING THE TIME PRECEDING THE WARNING DUE TO TSTMS.

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.