Air carrier makes go around when TCASII RA says climb.

Attributes
ACN	205735
Time
Date	199203
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 800 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Helicopter
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 3500 flight time type : 1200
ASRS Report	205735
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 2700
ASRS Report	205738
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3000 vertical : 350
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Go around due to TCASII RA inside OM. Received TCASII TA approximately 5.8 DME, traffic directly ahead and below. We observed no traffic and nne was reported to us, frequency congestion was high. On TCASII, traffic was getting closer to our flight path, we suspected a helicopter on visual to FBO but could not see any traffic. TCASII RA command to level off approximately 900 ft AGL. Traffic appeared on TCASII 1-2 mi ahead and 400 ft below decreasing to 300 ft below. TCASII commanded climb after I (first officer, PF) had leveled off. I initiated a rapid climb to follow TCASII while captain informed tower of our go around. The last I noticed, the TCASII indicated traffic 300 ft below and directly ahead as we climbed off the GS. The tower sounded very unpleased that we had initiated a go around. We followed controller's instructions around for an uneventful landing. Due to frequency congestion , the tower's communications were broken numerous times. On our second approach, tower informed us of 'another helicopter' on visual approach. We were able to identify this traffic just prior to receiving TCASII TA on same traffic. Possibly if we had been warned of traffic on the first approach, we may have been able to identify the traffic and maintained visual separation.

Original NASA ASRS Text

Title: ACR MAKES GAR WHEN TCASII RA SAYS CLB.

Narrative: GAR DUE TO TCASII RA INSIDE OM. RECEIVED TCASII TA APPROX 5.8 DME, TFC DIRECTLY AHEAD AND BELOW. WE OBSERVED NO TFC AND NNE WAS RPTED TO US, FREQ CONGESTION WAS HIGH. ON TCASII, TFC WAS GETTING CLOSER TO OUR FLT PATH, WE SUSPECTED A HELI ON VISUAL TO FBO BUT COULD NOT SEE ANY TFC. TCASII RA COMMAND TO LEVEL OFF APPROX 900 FT AGL. TFC APPEARED ON TCASII 1-2 MI AHEAD AND 400 FT BELOW DECREASING TO 300 FT BELOW. TCASII COMMANDED CLB AFTER I (FO, PF) HAD LEVELED OFF. I INITIATED A RAPID CLB TO FOLLOW TCASII WHILE CAPT INFORMED TWR OF OUR GAR. THE LAST I NOTICED, THE TCASII INDICATED TFC 300 FT BELOW AND DIRECTLY AHEAD AS WE CLBED OFF THE GS. THE TWR SOUNDED VERY UNPLEASED THAT WE HAD INITIATED A GAR. WE FOLLOWED CTLR'S INSTRUCTIONS AROUND FOR AN UNEVENTFUL LNDG. DUE TO FREQ CONGESTION , THE TWR'S COMS WERE BROKEN NUMEROUS TIMES. ON OUR SECOND APCH, TWR INFORMED US OF 'ANOTHER HELI' ON VISUAL APCH. WE WERE ABLE TO IDENT THIS TFC JUST PRIOR TO RECEIVING TCASII TA ON SAME TFC. POSSIBLY IF WE HAD BEEN WARNED OF TFC ON THE FIRST APCH, WE MAY HAVE BEEN ABLE TO IDENT THE TFC AND MAINTAINED VISUAL SEPARATION.

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.