Flight crew of an large transport air carrier aircraft stopped descent and climbed in response to a ...

Attributes
ACN	248205
Time
Date	199308
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 13500 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 185 flight time total : 13820 flight time type : 615
ASRS Report	248205
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 800
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cleared to descend to 13000 ft, direct to plant intersection on knox arrival to ord. Passing 15000 ft controller issued traffic warning at our 12 O'clock position. Did not have visual but target was on our TCASII scope. Target was below and climbing. Several seconds later, we got a TA and then an RA to climb. I stopped descent and climb approximately 300-500 ft before TCASII gave us a monitor vertical speed and then clear of conflict. Without TCASII this would have been a very close miss, target was a twin climbing to 13500 ft VFR. We advised ATC of the RA and they said we were clear of traffic and to continue our descent to 11000 ft.

Original NASA ASRS Text

Title: FLC OF AN LGT ACR ACFT STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA.

Narrative: CLRED TO DSND TO 13000 FT, DIRECT TO PLANT INTXN ON KNOX ARR TO ORD. PASSING 15000 FT CTLR ISSUED TFC WARNING AT OUR 12 O'CLOCK POS. DID NOT HAVE VISUAL BUT TARGET WAS ON OUR TCASII SCOPE. TARGET WAS BELOW AND CLBING. SEVERAL SECONDS LATER, WE GOT A TA AND THEN AN RA TO CLB. I STOPPED DSCNT AND CLB APPROX 300-500 FT BEFORE TCASII GAVE US A MONITOR VERT SPD AND THEN CLR OF CONFLICT. WITHOUT TCASII THIS WOULD HAVE BEEN A VERY CLOSE MISS, TARGET WAS A TWIN CLBING TO 13500 FT VFR. WE ADVISED ATC OF THE RA AND THEY SAID WE WERE CLR OF TFC AND TO CONTINUE OUR DSCNT TO 11000 FT.

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.

Flight crew of an large transport air carrier aircraft stopped descent and climbed in response to a TCASII RA.