Air carrier X TCASII TA RA evasive action taken descent had less than standard separation with air carrier Y. System error. Air carrier X failed to make crossing restriction. Pilot deviation.

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Attributes
ACN	204064
Time
Date	199203
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cvg
State Reference	OH
Altitude	msl bound lower : 22000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 3000
ASRS Report	204064
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10600 flight time type : 2400
ASRS Report	203656
Events
Anomaly	altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Air carrier X overhead cvg at FL240 when we received clearance to cross 20 NM south of cvg at 13000 ft. As we began our descent we received a TCASII TA on an aircraft at approximately 7 NM and 600 ft below. In the descent we got a TCASII RA to descend at greater than 2000 FPM which we did. Saw air carrier Y as we went under him by 1000 ft (approximately) and a mi ahead. Estimate his altitude to be FL220. I asked the controller about the traffic and the apparently late descent clearance. He ignored my question. We were approximately 2000 ft high on our crossing restrictions. Again the controller did not respond to our question and simply handed us off to sdf approach. TCASII may have saved a midair.

Original NASA ASRS Text

Title: ACR X TCASII TA RA EVASIVE ACTION TAKEN DSCNT HAD LTSS WITH ACR Y. SYS ERROR. ACR X FAILED TO MAKE XING RESTRICTION. PLTDEV.

Narrative: ACR X OVERHEAD CVG AT FL240 WHEN WE RECEIVED CLRNC TO CROSS 20 NM S OF CVG AT 13000 FT. AS WE BEGAN OUR DSCNT WE RECEIVED A TCASII TA ON AN ACFT AT APPROX 7 NM AND 600 FT BELOW. IN THE DSCNT WE GOT A TCASII RA TO DSND AT GREATER THAN 2000 FPM WHICH WE DID. SAW ACR Y AS WE WENT UNDER HIM BY 1000 FT (APPROX) AND A MI AHEAD. ESTIMATE HIS ALT TO BE FL220. I ASKED THE CTLR ABOUT THE TFC AND THE APPARENTLY LATE DSCNT CLRNC. HE IGNORED MY QUESTION. WE WERE APPROX 2000 FT HIGH ON OUR XING RESTRICTIONS. AGAIN THE CTLR DID NOT RESPOND TO OUR QUESTION AND SIMPLY HANDED US OFF TO SDF APCH. TCASII MAY HAVE SAVED A MIDAIR.

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.