B737 crew reacts to TCAS RA at 5000 ft departing ord.

Attributes
ACN	714945
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 5000
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 210 flight time total : 11000 flight time type : 2000
ASRS Report	714945
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	other controllera
Resolutory Action	aircraft : equipment problem dissipated controller : issued advisory flight crew : took evasive action
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On climb out from ord; level at 5000 ft; we received a TCAS RA with target traffic co-altitude and co-located with our position. We followed the RA guidance (descending); and informed approach control as they instructed us to climb to 13000 ft. Approach informed us that they had no traffic in our vicinity. I then asked for a turn; which was granted; and RA traffic remained co-located and co-altitude with us throughout our maneuvering. Given the lack of traffic according to ord approach; and believing the RA to be false; I recycled the transponder and the RA disappeared. We then accepted clearance and proceeded on course.

Original NASA ASRS Text

Title: B737 CREW REACTS TO TCAS RA AT 5000 FT DEPARTING ORD.

Narrative: ON CLBOUT FROM ORD; LEVEL AT 5000 FT; WE RECEIVED A TCAS RA WITH TARGET TFC CO-ALT AND CO-LOCATED WITH OUR POS. WE FOLLOWED THE RA GUIDANCE (DSNDING); AND INFORMED APCH CTL AS THEY INSTRUCTED US TO CLB TO 13000 FT. APCH INFORMED US THAT THEY HAD NO TFC IN OUR VICINITY. I THEN ASKED FOR A TURN; WHICH WAS GRANTED; AND RA TFC REMAINED CO-LOCATED AND CO-ALT WITH US THROUGHOUT OUR MANEUVERING. GIVEN THE LACK OF TFC ACCORDING TO ORD APCH; AND BELIEVING THE RA TO BE FALSE; I RECYCLED THE XPONDER AND THE RA DISAPPEARED. WE THEN ACCEPTED CLRNC AND PROCEEDED ON COURSE.

Data retrieved from NASA's ASRS site as of January 2009 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.