Controller climbed air carrier through altitude of another air carrier, but situation corrected before less than standard separation. Operational deviation.

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Attributes
ACN	95793
Time
Date	198810
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iiu
State Reference	KY
Altitude	msl bound lower : 31000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute airway : zid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 3000
ASRS Report	95793
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 60000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Climbing through FL318 to assigned altitude of FL350, center controller advised you are a little high, descend to FL310. I responded that our clearance was to FL350, and asked if he wanted us to descend to FL310. He responded affirmatively and called traffic (air carrier Y) at 12 NM and FL330. We confirmed with him that we were in a descent to FL310. Our assignment had been to FL350, and we read back that clearance to the controller. Both pilots heard the altitude assignment clearly. Controller error.

Original NASA ASRS Text

Title: CTLR CLIMBED ACR THROUGH ALT OF ANOTHER ACR, BUT SITUATION CORRECTED BEFORE LESS THAN STANDARD SEPARATION. OPERATIONAL DEVIATION.

Narrative: CLBING THROUGH FL318 TO ASSIGNED ALT OF FL350, CENTER CTLR ADVISED YOU ARE A LITTLE HIGH, DSND TO FL310. I RESPONDED THAT OUR CLRNC WAS TO FL350, AND ASKED IF HE WANTED US TO DSND TO FL310. HE RESPONDED AFFIRMATIVELY AND CALLED TFC (ACR Y) AT 12 NM AND FL330. WE CONFIRMED WITH HIM THAT WE WERE IN A DSCNT TO FL310. OUR ASSIGNMENT HAD BEEN TO FL350, AND WE READ BACK THAT CLRNC TO THE CTLR. BOTH PLTS HEARD THE ALT ASSIGNMENT CLEARLY. CTLR ERROR.

Data retrieved from NASA's ASRS site as of August 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.