Flight crew receives TCASII traffic alert.

Attributes
ACN	548137
Time
Date	200205
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : grr.airport
State Reference	MI
Altitude	msl single value : 25000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zau.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 0 flight time total : 2300 flight time type : 0
ASRS Report	548137
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 150
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were cleared to descend to FL240 when the TCASII gave a 'TA.' captain leveled off at FL253 because the traffic was at our 12 O'clock position only 200 ft below. Chicago gave us a right 40 degree turn and the traffic continued to be straight ahead. We asked about traffic and they said it was straight ahead and 4 NM. We were then told to turn left to 310 degrees. Turning left we were then cleared to grr.

Original NASA ASRS Text

Title: FLC RECEIVES TCASII TFC ALERT.

Narrative: WE WERE CLRED TO DSND TO FL240 WHEN THE TCASII GAVE A 'TA.' CAPT LEVELED OFF AT FL253 BECAUSE THE TFC WAS AT OUR 12 O'CLOCK POS ONLY 200 FT BELOW. CHICAGO GAVE US A R 40 DEG TURN AND THE TFC CONTINUED TO BE STRAIGHT AHEAD. WE ASKED ABOUT TFC AND THEY SAID IT WAS STRAIGHT AHEAD AND 4 NM. WE WERE THEN TOLD TO TURN L TO 310 DEGS. TURNING L WE WERE THEN CLRED TO GRR.

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.