Lex controller experienced pilot altitude deviation at 10000 ft.

Attributes
ACN	615224
Time
Date	200404
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : hyk.vortac
State Reference	KY
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lex.tracon tower : sju.tower
Operator	general aviation : corporate
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 30 controller radar : 30 controller time certified in position1 : 30
ASRS Report	615224
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

King air broke altitude assignment and I told the king air pilot. The king air pilot then maintained VFR conditions to assigned altitude. Contributing factor: lex radar controller usually transmits on 12 frequencys and listens to 12 frequencys all the time. Corrective action: should put all aircraft on 1 frequency.

Original NASA ASRS Text

Title: LEX CTLR EXPERIENCED PLT ALT DEV AT 10000 FT.

Narrative: KING AIR BROKE ALT ASSIGNMENT AND I TOLD THE KING AIR PLT. THE KING AIR PLT THEN MAINTAINED VFR CONDITIONS TO ASSIGNED ALT. CONTRIBUTING FACTOR: LEX RADAR CTLR USUALLY XMITS ON 12 FREQS AND LISTENS TO 12 FREQS ALL THE TIME. CORRECTIVE ACTION: SHOULD PUT ALL ACFT ON 1 FREQ.

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.