Flight crew of an air carrier large transport aircraft deviated from assigned descent altitude in re...

Attributes
ACN	242118
Time
Date	199305
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 7500 msl bound upper : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 2000
ASRS Report	242118
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	unspecified : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Normal descent into cvg area. WX was 6000 ft overcast. While on vectors from cvg, at 8000 ft, we noticed traffic level at 12 O'clock on our TCASII display. Shortly we received a TA and RA on TCASII calling for immediate descent. We followed TCASII descent to 7500 ft and advised ATC. We were told that traffic was an large transport and we were then given a descent and new heading. We don't know how close we came to this other aircraft due to being in WX but feel that TCASII saved us from potential disaster.

Original NASA ASRS Text

Title: FLC OF AN ACR LGT ACFT DEVIATED FROM ASSIGNED DSCNT ALT IN RESPONSE OF A TCASII RA.

Narrative: NORMAL DSCNT INTO CVG AREA. WX WAS 6000 FT OVCST. WHILE ON VECTORS FROM CVG, AT 8000 FT, WE NOTICED TFC LEVEL AT 12 O'CLOCK ON OUR TCASII DISPLAY. SHORTLY WE RECEIVED A TA AND RA ON TCASII CALLING FOR IMMEDIATE DSCNT. WE FOLLOWED TCASII DSCNT TO 7500 FT AND ADVISED ATC. WE WERE TOLD THAT TFC WAS AN LGT AND WE WERE THEN GIVEN A DSCNT AND NEW HDG. WE DON'T KNOW HOW CLOSE WE CAME TO THIS OTHER ACFT DUE TO BEING IN WX BUT FEEL THAT TCASII SAVED US FROM POTENTIAL DISASTER.

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 air carrier large transport aircraft deviated from assigned descent altitude in response of a TCASII RA.