Air carrier receives TCASII RA to climb, then RA to descend. Complies.

Attributes
ACN	229062
Time
Date	199212
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 165 flight time total : 5654 flight time type : 2253
ASRS Report	229062
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 183 flight time total : 9383 flight time type : 6000
ASRS Report	229061
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

While descending for an ILS approach to runway 27R at ord we received a TCASII RA to climb. The TCASII indicated an aircraft to our right and below us. The captain initiated a climb using the indicated reference on the vvi. As I attempted to locate the traffic and talk to approach about our RA, a second aircraft appeared on the TCASII display and we received a descend RA. This aircraft was above and to our left. At this point the captain again followed the TCASII vvi indications and started a descent. Approach also gave us a turn to the south away from the traffic above us. At this time the TCASII indicated we were clear of both conflicts. We were descending to 4000 ft when this occurred and our climb took us up to approximately 4800 ft prior to our second descent. ATC did not give us traffic information on either aircraft indicated on our TCASII display and indicated surprise when we had to maneuver.

Original NASA ASRS Text

Title: ACR RECEIVES TCASII RA TO CLB, THEN RA TO DSND. COMPLIES.

Narrative: WHILE DSNDING FOR AN ILS APCH TO RWY 27R AT ORD WE RECEIVED A TCASII RA TO CLB. THE TCASII INDICATED AN ACFT TO OUR R AND BELOW US. THE CAPT INITIATED A CLB USING THE INDICATED REF ON THE VVI. AS I ATTEMPTED TO LOCATE THE TFC AND TALK TO APCH ABOUT OUR RA, A SECOND ACFT APPEARED ON THE TCASII DISPLAY AND WE RECEIVED A DSND RA. THIS ACFT WAS ABOVE AND TO OUR L. AT THIS POINT THE CAPT AGAIN FOLLOWED THE TCASII VVI INDICATIONS AND STARTED A DSCNT. APCH ALSO GAVE US A TURN TO THE S AWAY FROM THE TFC ABOVE US. AT THIS TIME THE TCASII INDICATED WE WERE CLR OF BOTH CONFLICTS. WE WERE DSNDING TO 4000 FT WHEN THIS OCCURRED AND OUR CLB TOOK US UP TO APPROX 4800 FT PRIOR TO OUR SECOND DSCNT. ATC DID NOT GIVE US TFC INFO ON EITHER ACFT INDICATED ON OUR TCASII DISPLAY AND INDICATED SURPRISE WHEN WE HAD TO MANEUVER.

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.