Fgt Y had less than standard separation from small aircraft X. Pilot deviation.

Attributes
ACN	151398
Time
Date	199007
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : iso
State Reference	NC
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tower : roc
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 3
ASRS Report	151398
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 9000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Small aircraft X was an overflt, level at 13000', deviating west of course (due to some WX build-ups, circuit breaker's). Cleared direct to cvi when able. Flight Y was a flight of 2 fgt's climbing out of gsb AFB proceeding to R5314, requesting 13000'. Flight Y was issued a clearance to 12000' and given clearance to proceed direct eegel (a short cut requested by the pilot). When I saw fgt Y altitude readout of 12200', I asked him his altitude, he said he was climbing to 13000'. I gave fgt Y an immediate descent clearance to 12000' and called the traffic (small aircraft X) to him. He said the traffic was not a factor. I told small aircraft X about the fgt's and that fgt Y said they had him in sight. I then notified the area supervisor of the situation and told the fgt Y pilot that an altitude deviation may have occurred and that he could contact the washington center quality assurance office for more information. According to quality assurance, the computer conflict alert and 'snitch' functions never activated and that it was not possible to tell by reviewing the frequency tape what altitude fgt Y read back when assigned 12000'.

Original NASA ASRS Text

Title: FGT Y HAD LESS THAN STANDARD SEPARATION FROM SMA X. PLTDEV.

Narrative: SMA X WAS AN OVERFLT, LEVEL AT 13000', DEVIATING W OF COURSE (DUE TO SOME WX BUILD-UPS, CB'S). CLRED DIRECT TO CVI WHEN ABLE. FLT Y WAS A FLT OF 2 FGT'S CLBING OUT OF GSB AFB PROCEEDING TO R5314, REQUESTING 13000'. FLT Y WAS ISSUED A CLRNC TO 12000' AND GIVEN CLRNC TO PROCEED DIRECT EEGEL (A SHORT CUT REQUESTED BY THE PLT). WHEN I SAW FGT Y ALT READOUT OF 12200', I ASKED HIM HIS ALT, HE SAID HE WAS CLBING TO 13000'. I GAVE FGT Y AN IMMEDIATE DSNT CLRNC TO 12000' AND CALLED THE TFC (SMA X) TO HIM. HE SAID THE TFC WAS NOT A FACTOR. I TOLD SMA X ABOUT THE FGT'S AND THAT FGT Y SAID THEY HAD HIM IN SIGHT. I THEN NOTIFIED THE AREA SUPVR OF THE SITUATION AND TOLD THE FGT Y PLT THAT AN ALT DEV MAY HAVE OCCURRED AND THAT HE COULD CONTACT THE WASHINGTON CTR QUALITY ASSURANCE OFFICE FOR MORE INFO. ACCORDING TO QUALITY ASSURANCE, THE COMPUTER CONFLICT ALERT AND 'SNITCH' FUNCTIONS NEVER ACTIVATED AND THAT IT WAS NOT POSSIBLE TO TELL BY REVIEWING THE FREQ TAPE WHAT ALT FGT Y READ BACK WHEN ASSIGNED 12000'.

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.