Air carrier came in close proximity to another aircraft.

Attributes
ACN	131645
Time
Date	198912
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rdu
State Reference	NC
Altitude	msl bound lower : 11600 msl bound upper : 11600
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	other
Make Model Name	Fighter
Flight Phase	descent other
Route In Use	enroute airway : zdc
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 25
ASRS Report	131645
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : radar
Experience	controller military : 4 controller radar : 22
ASRS Report	131580
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Fgt X flight had cancelled IFR about 3 mins before the incident. I continued to track the target visually and called traffic to air carrier Y when the aircraft were about 10 mi away. The air carrier Y saw fgt X. I again called traffic when they were about 3-4 mi apart. Air carrier Y said he still had the traffic. Fgt's are normally much lower at that point and since air carrier Y had been watching the traffic all along, I did not stop his descent. When air carrier Y was at about 11,600', he said he was going to go over the traffic. He later said he took evasive action and was going to file an near midair collision. He asked where fgt X was from and I gave him the aircraft call sign and where based.

Original NASA ASRS Text

Title: ACR CAME IN CLOSE PROX TO ANOTHER ACFT.

Narrative: FGT X FLT HAD CANCELLED IFR ABOUT 3 MINS BEFORE THE INCIDENT. I CONTINUED TO TRACK THE TARGET VISUALLY AND CALLED TFC TO ACR Y WHEN THE ACFT WERE ABOUT 10 MI AWAY. THE ACR Y SAW FGT X. I AGAIN CALLED TFC WHEN THEY WERE ABOUT 3-4 MI APART. ACR Y SAID HE STILL HAD THE TFC. FGT'S ARE NORMALLY MUCH LOWER AT THAT POINT AND SINCE ACR Y HAD BEEN WATCHING THE TFC ALL ALONG, I DID NOT STOP HIS DSCNT. WHEN ACR Y WAS AT ABOUT 11,600', HE SAID HE WAS GOING TO GO OVER THE TFC. HE LATER SAID HE TOOK EVASIVE ACTION AND WAS GOING TO FILE AN NMAC. HE ASKED WHERE FGT X WAS FROM AND I GAVE HIM THE ACFT CALL SIGN AND WHERE BASED.

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.