Military aircraft climbed to occupied altitude without authorized resulting in loss of separation.

Attributes
ACN	200151
Time
Date	199201
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gnv
State Reference	FL
Altitude	msl bound lower : 18000 msl bound upper : 19000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	other
Make Model Name	Fighter
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 1
ASRS Report	200151
Person 2
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : military
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 21000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While controling traffic, I had a sbound turbo propeller at FL190. Jacksonville approach flashes a handoff an fgt climbing to FL150. The handoff was accepted and the fgt checked on frequency leveling at FL150. I issued a clearance to climb to FL180. The pilot acknowledged 'roger climbing to 18'. Leaving 170000 I cleared the fgt direct tallahassee VOR which put him on a converging course wbound with the sbound traffic. I noticed the fgt's mode C at FL184 and asked the pilot to 'verify level at FL180' with no acknowledgement I asked again 'verify level at FL180'. The pilot then responded 'roger back to 180'. I then asked the pilot to 'verify your assigned altitude was FL180'. The pilot said 'roger'. As a result separation was lost with the turbo propeller at FL190 by 600 ft and 3 1/2 mis due to pilot error.

Original NASA ASRS Text

Title: MIL ACFT CLBED TO OCCUPIED ALT WITHOUT AUTHORIZED RESULTING IN LOSS OF SEPARATION.

Narrative: WHILE CTLING TFC, I HAD A SBOUND TURBO PROP AT FL190. JACKSONVILLE APCH FLASHES A HDOF AN FGT CLBING TO FL150. THE HDOF WAS ACCEPTED AND THE FGT CHKED ON FREQ LEVELING AT FL150. I ISSUED A CLRNC TO CLB TO FL180. THE PLT ACKNOWLEDGED 'ROGER CLBING TO 18'. LEAVING 170000 I CLRED THE FGT DIRECT TALLAHASSEE VOR WHICH PUT HIM ON A CONVERGING COURSE WBOUND WITH THE SBOUND TFC. I NOTICED THE FGT'S MODE C AT FL184 AND ASKED THE PLT TO 'VERIFY LEVEL AT FL180' WITH NO ACKNOWLEDGEMENT I ASKED AGAIN 'VERIFY LEVEL AT FL180'. THE PLT THEN RESPONDED 'ROGER BACK TO 180'. I THEN ASKED THE PLT TO 'VERIFY YOUR ASSIGNED ALT WAS FL180'. THE PLT SAID 'ROGER'. AS A RESULT SEPARATION WAS LOST WITH THE TURBO PROP AT FL190 BY 600 FT AND 3 1/2 MIS DUE TO PLT ERROR.

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.