Air carrier X had less than standard radar separation from air carrier Y. System error.

Attributes
ACN	153329
Time
Date	199008
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : fll
State Reference	FL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 4 controller radar : 8
ASRS Report	153329
Person 2
Affiliation	government : faa
Function	oversight : coordinator
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Air carrier X departed fll eastbound climbing to 3000'. I radar idented him and took a handoff on another aircraft at 4000'. Previous coordination led me to believe the 4000' traffic was heading 360 degrees. I climbed the air carrier X to 5000'. In reality, the air carrier Y at 4000' was eastbound and not turned north until after the handoff was made. When the air carrier Y turned north he saw the air carrier X climbing off his left and made an evasive turn back to east while maintaining visibility sep on the air carrier X. Had the air carrier Y entered my airspace northbound he would have passed behind the air carrier X. Had I observed the track of the air carrier Y I would not have discontinued vertical sep. Callback conversation with reporter revealed the following: reporter experience: 4 yrs military, 8 yrs radar, fpl. Miss distance: 1/2 mi horizontal, 0 vertical. System error filed, C/a activated. The reporter stated the coordination said, 'the flight will be heading north when he comes to you.' the reporter took an automate radar handoff but did not watch air carrier Y to see his direction of flight.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD RADAR SEPARATION FROM ACR Y. SYSTEM ERROR.

Narrative: ACR X DEPARTED FLL EBND CLBING TO 3000'. I RADAR IDENTED HIM AND TOOK A HDOF ON ANOTHER ACFT AT 4000'. PREVIOUS COORD LED ME TO BELIEVE THE 4000' TFC WAS HDG 360 DEGS. I CLBED THE ACR X TO 5000'. IN REALITY, THE ACR Y AT 4000' WAS EBND AND NOT TURNED N UNTIL AFTER THE HDOF WAS MADE. WHEN THE ACR Y TURNED N HE SAW THE ACR X CLBING OFF HIS LEFT AND MADE AN EVASIVE TURN BACK TO E WHILE MAINTAINING VIS SEP ON THE ACR X. HAD THE ACR Y ENTERED MY AIRSPACE NBND HE WOULD HAVE PASSED BEHIND THE ACR X. HAD I OBSERVED THE TRACK OF THE ACR Y I WOULD NOT HAVE DISCONTINUED VERT SEP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR EXPERIENCE: 4 YRS MIL, 8 YRS RADAR, FPL. MISS DISTANCE: 1/2 MI HORIZ, 0 VERT. SYS ERROR FILED, C/A ACTIVATED. THE RPTR STATED THE COORD SAID, 'THE FLT WILL BE HDG N WHEN HE COMES TO YOU.' THE RPTR TOOK AN AUTOMATE RADAR HDOF BUT DID NOT WATCH ACR Y TO SEE HIS DIRECTION OF FLT.

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.