Air carrier X descended to wrong altitude had less than standard separation from cpr Y. System error...

Attributes
ACN	170282
Time
Date	199102
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cvg
State Reference	OH
Altitude	msl bound lower : 7000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg tower : mia
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time total : 7000
ASRS Report	170282
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Air carrier X from charlotte, nc, to cincinnati, oh. Captain was flying, I (first officer) was working radios. We were working cincinnati approach 123.87 35 south. Our TCAS system was operational and voiced 'traffic, traffic' and showed traffic on the radar at 8 O'clock, 800' below us climbing. We had the cpr Y in sight and we heard the cpr Y tell approach he had us in sight. We had been cleared to 7000' and as we watched the radar/TCAS, we realized cpr Y was climbing up to or through our altitude. At that point approach asked us to verify our altitude was 8000' as were descending through 7500'. We verified that we were cleared to 7000'. We asked if there was a conflict and if so we would pull the voice recorder circuit breaker to save the tape. The controller said no conflict. When approach gave us the clearance to 7000', I responded air carrier X 7000'. The controller never responded or corrected me.

Original NASA ASRS Text

Title: ACR X DESCENDED TO WRONG ALT HAD LESS THAN STANDARD SEPARATION FROM CPR Y. SYSTEM ERROR. PLTDEV.

Narrative: ACR X FROM CHARLOTTE, NC, TO CINCINNATI, OH. CAPT WAS FLYING, I (F/O) WAS WORKING RADIOS. WE WERE WORKING CINCINNATI APCH 123.87 35 S. OUR TCAS SYS WAS OPERATIONAL AND VOICED 'TFC, TFC' AND SHOWED TFC ON THE RADAR AT 8 O'CLOCK, 800' BELOW US CLBING. WE HAD THE CPR Y IN SIGHT AND WE HEARD THE CPR Y TELL APCH HE HAD US IN SIGHT. WE HAD BEEN CLRED TO 7000' AND AS WE WATCHED THE RADAR/TCAS, WE REALIZED CPR Y WAS CLBING UP TO OR THROUGH OUR ALT. AT THAT POINT APCH ASKED US TO VERIFY OUR ALT WAS 8000' AS WERE DSNDING THROUGH 7500'. WE VERIFIED THAT WE WERE CLRED TO 7000'. WE ASKED IF THERE WAS A CONFLICT AND IF SO WE WOULD PULL THE VOICE RECORDER CB TO SAVE THE TAPE. THE CTLR SAID NO CONFLICT. WHEN APCH GAVE US THE CLRNC TO 7000', I RESPONDED ACR X 7000'. THE CTLR NEVER RESPONDED OR CORRECTED ME.

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.

Air carrier X descended to wrong altitude had less than standard separation from cpr Y. System error. Pilot deviation.