Small transport saw 2 fgt aircraft pass in close proximity and declared a midair.

Attributes
ACN	161756
Time
Date	199010
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : nrr airport : sju
State Reference	PR
Altitude	msl bound lower : 6000 msl bound upper : 6100
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sju tower : den
Operator	common carrier : air carrier
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	cruise other descent other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 9
ASRS Report	161756
Person 2
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 4000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other
Situations
ATC Facility	other physical facility

Narrative:

Primary radar was not working acceptably. Supervisor was informed no action was taken. I am a fpl controller at san juan and was working R3 sector at approximately XX35 local. Small transport X said he was 'making an immediate left turn to avoid a heavy jet.' at this time a 1200 mode 3/a transponder appeared on radar indicating 6100' MSL and doing 330 KTS within 12 mi of shore. About 1 min later this aircraft changed to a XXXX code in navy roosevelt roads airspace. I inquired to navy roosevelt and discovered this was actually 2 fgt Y aircraft. They did not see the small transport X. The small transport X filed a near midair occurrence. I believe it is imperative that we receive radar systems at st thomas usvi (the old one was destroyed by hurricane hugo, 9/89) and at st croix usvi. These are densely traveled islands. Also, it is imperative these islands develop arsa service.

Original NASA ASRS Text

Title: SMT SAW 2 FGT ACFT PASS IN CLOSE PROX AND DECLARED A MIDAIR.

Narrative: PRIMARY RADAR WAS NOT WORKING ACCEPTABLY. SUPVR WAS INFORMED NO ACTION WAS TAKEN. I AM A FPL CTLR AT SAN JUAN AND WAS WORKING R3 SECTOR AT APPROX XX35 LCL. SMT X SAID HE WAS 'MAKING AN IMMEDIATE LEFT TURN TO AVOID A HVY JET.' AT THIS TIME A 1200 MODE 3/A XPONDER APPEARED ON RADAR INDICATING 6100' MSL AND DOING 330 KTS WITHIN 12 MI OF SHORE. ABOUT 1 MIN LATER THIS ACFT CHANGED TO A XXXX CODE IN NAVY ROOSEVELT ROADS AIRSPACE. I INQUIRED TO NAVY ROOSEVELT AND DISCOVERED THIS WAS ACTUALLY 2 FGT Y ACFT. THEY DID NOT SEE THE SMT X. THE SMT X FILED A NEAR MIDAIR OCCURRENCE. I BELIEVE IT IS IMPERATIVE THAT WE RECEIVE RADAR SYSTEMS AT ST THOMAS USVI (THE OLD ONE WAS DESTROYED BY HURRICANE HUGO, 9/89) AND AT ST CROIX USVI. THESE ARE DENSELY TRAVELED ISLANDS. ALSO, IT IS IMPERATIVE THESE ISLANDS DEVELOP ARSA SVC.

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.