Controller cleared light transport to descend to 12000, aircraft read back 10000 and less than standard separation occurred with small transport at 11000. Controller training in progress, operational error.

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Attributes
ACN	86374
Time
Date	198804
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cvg
State Reference	OH
Altitude	msl bound lower : 11000 msl bound upper : 11100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute airway : zid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Experience	controller non radar : 2
ASRS Report	86374
Person 2
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 26400 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Light transport X at 13000, small transport Y at 11000. Light transport X nwbnd descended to 120 (small transport Y sebnd). Erroneous readback by light transport X to 10000. Discovered this when light transport X out of 11500 and descending. Light transport X reclred to 12000. Small transport Y told to expedite to 7000. To prevent a recurrence of this, listen to readbacks.

Original NASA ASRS Text

Title: CTLR CLEARED LTT TO DESCEND TO 12000, ACFT READ BACK 10000 AND LESS THAN STANDARD SEPARATION OCCURRED WITH SMT AT 11000. CTLR TRAINING IN PROGRESS, OPERATIONAL ERROR.

Narrative: LTT X AT 13000, SMT Y AT 11000. LTT X NWBND DESCENDED TO 120 (SMT Y SEBND). ERRONEOUS READBACK BY LTT X TO 10000. DISCOVERED THIS WHEN LTT X OUT OF 11500 AND DESCENDING. LTT X RECLRED TO 12000. SMT Y TOLD TO EXPEDITE TO 7000. TO PREVENT A RECURRENCE OF THIS, LISTEN TO READBACKS.

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.