Small transport X WX deviation had less than standard separation from Y. System error.

Attributes
ACN	283087
Time
Date	199409
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zbv
State Reference	FL
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bhm
Make Model Name	Cessna 402/402C/B379 Businessliner/Utiliner
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute airway : zma
Flight Plan	IFR
Aircraft 2
Make Model Name	Airliner 99
Operating Under FAR Part	Part 121
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 7 controller radar : 6
ASRS Report	283087
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small transport X cessna 402 traveling eastbound on a 090 degree heading needed to deviate a little bit south of course for WX. Due to inconsistent histories and jumping targets we were unable to detect that the aircraft had turned to an approximately 240 degree heading. This resulted in a conflict with Y, a be-99 also at 9000 ft. The C-402 was descended to 8000 and the be-99 climbed to 10000 ft. Ever since hurricane andrew blew through here, the radar hasn't been right. I think that if we would have had good WX radar we might have been able to expect the cessna to turn that far.

Original NASA ASRS Text

Title: SMT X WX DEV HAD LTSS FROM Y. SYS ERROR.

Narrative: SMT X CESSNA 402 TRAVELING EBOUND ON A 090 DEG HDG NEEDED TO DEVIATE A LITTLE BIT S OF COURSE FOR WX. DUE TO INCONSISTENT HISTORIES AND JUMPING TARGETS WE WERE UNABLE TO DETECT THAT THE ACFT HAD TURNED TO AN APPROX 240 DEG HDG. THIS RESULTED IN A CONFLICT WITH Y, A BE-99 ALSO AT 9000 FT. THE C-402 WAS DSNDED TO 8000 AND THE BE-99 CLBED TO 10000 FT. EVER SINCE HURRICANE ANDREW BLEW THROUGH HERE, THE RADAR HASN'T BEEN RIGHT. I THINK THAT IF WE WOULD HAVE HAD GOOD WX RADAR WE MIGHT HAVE BEEN ABLE TO EXPECT THE CESSNA TO TURN THAT FAR.

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.