Air carrier has TCASII RA from aircraft below. Evasive action climb.

Attributes
ACN	200862
Time
Date	199202
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 11000 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : dtw
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 2000
ASRS Report	200862
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Under dtw approach control 11000 ft level flight. TCASII traffic warning. Located aircraft visually. Climbing from below high rate climb. No information about traffic from approach. Received TCASII RA to climb now. Left 11000 ft in response to RA. Advised controller immediately of deviation and reasons. Was informed in rather patronizing terms exactly what traffic was and what it was doing. Had they done this before problem arose no problem would have existed. Because approach did not alert us to the aircraft we had no way of knowing that it would level 1000 ft below. Altitude deviation no more than 500 ft high. Returned to assigned as soon as clear of conflict. Aircraft in question was not identifiable except as a light. Could have been anything. Was climbing fast and on a close collision course. Could have been busted altitude, controller error, anything. ATC must learn to alert us to situations that TCASII might interpret as a conflict.

Original NASA ASRS Text

Title: ACR HAS TCASII RA FROM ACFT BELOW. EVASIVE ACTION CLB.

Narrative: UNDER DTW APCH CTL 11000 FT LEVEL FLT. TCASII TFC WARNING. LOCATED ACFT VISUALLY. CLBING FROM BELOW HIGH RATE CLB. NO INFO ABOUT TFC FROM APCH. RECEIVED TCASII RA TO CLB NOW. LEFT 11000 FT IN RESPONSE TO RA. ADVISED CTLR IMMEDIATELY OF DEV AND REASONS. WAS INFORMED IN RATHER PATRONIZING TERMS EXACTLY WHAT TFC WAS AND WHAT IT WAS DOING. HAD THEY DONE THIS BEFORE PROBLEM AROSE NO PROBLEM WOULD HAVE EXISTED. BECAUSE APCH DID NOT ALERT US TO THE ACFT WE HAD NO WAY OF KNOWING THAT IT WOULD LEVEL 1000 FT BELOW. ALTDEV NO MORE THAN 500 FT HIGH. RETURNED TO ASSIGNED AS SOON AS CLR OF CONFLICT. ACFT IN QUESTION WAS NOT IDENTIFIABLE EXCEPT AS A LIGHT. COULD HAVE BEEN ANYTHING. WAS CLBING FAST AND ON A CLOSE COLLISION COURSE. COULD HAVE BEEN BUSTED ALT, CTLR ERROR, ANYTHING. ATC MUST LEARN TO ALERT US TO SITUATIONS THAT TCASII MIGHT INTERPRET AS A CONFLICT.

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.