TCAS commanded climb caused altitude deviation.

Attributes
ACN	182431
Time
Date	199106
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 5300 msl bound upper : 5300
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dtw tower : isp
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 3000
ASRS Report	182431
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 4000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While turning final for runway 21R at dtw we received an RA from our TCAS calling for a climb. We arrested our descent, climbed 100-200' and the RA changed to 'monitor vertical speed.' we queried the controller who advised VFR traffic at 1:30 who we subsequently spotted.

Original NASA ASRS Text

Title: TCAS COMMANDED CLIMB CAUSED ALT DEVIATION.

Narrative: WHILE TURNING FINAL FOR RWY 21R AT DTW WE RECEIVED AN RA FROM OUR TCAS CALLING FOR A CLB. WE ARRESTED OUR DSNT, CLBED 100-200' AND THE RA CHANGED TO 'MONITOR VERT SPD.' WE QUERIED THE CTLR WHO ADVISED VFR TFC AT 1:30 WHO WE SUBSEQUENTLY SPOTTED.

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.