Narrative:

The following event took place oct/xa/97 at AB22. The location of this incident was estimated to be 5 NM south of isla grande airport, or about 1 NM south of patty (sj) LOM at 1500 ft MSL. I was PIC of aircraft on final for sju runway 10. The other aircraft involved was a britten norman tri- islander. Flight was conducted under VFR rules and conditions, and the altimeter setting was 29.99 inches of mercury. The flight conditions at the time of the incident were cavu. I was on a 080 degree heading, between the 2 locs of sju in a direct course for the airport. The flight was on its final leg returning from ponce to sju, and after leveling off at 1500 ft I proceeded to complete the before landing checklist. After completing the before landing checklist I looked outside my left window to my 9 O'clock position to begin an outside scan from left to right. To my surprise, when looking at my 11 O'clock position, there was a britten norman tri- islander turning toward isla grande airport in what looked like a right base for runway 9 at isla grande airport. I have estimated the separation between both aircraft to be 200 ft horizontal separation and 100 ft vertical separation. The aircraft had already crossed my flight path from my right to my left. At this time no evasive action was necessary. No injuries or damage resulted from this incident. My passenger, seated to my right, told me that he had seen the other aircraft and even when he thought that it was closer than normal did not say anything because he believed that I had the aircraft in sight. I never heard the other aircraft on tower frequency. Factors that influenced this incident are that both aircraft were on different frequencys, I was talking to sju tower and the other aircraft was talking to sju approach, the sju ASR was down for maintenance after a couple of failures during the past few months. Also, the fact that my passenger did not advise when he saw the other aircraft and thought it was a little close to us. I should also mention the time I spend (about 30 seconds) looking inside the cockpit to complete a checklist within 5 mi of the destination airport. I elected not to advise the tower of the incident until I was safely on the ground, where I called the tower to inform the incident. An investigation is under way to find out where the system failed so that another encounter like this one can be prevented.

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Original NASA ASRS Text

Title: C208 ATX PLT HAS AN NMAC WITH A TRI-ISLANDER ATX XING IN FRONT OF HIM. ACFT X WAS ON FINAL FOR SJU. ACFT Y WAS ON A BASE LEG FOR ISLA GRANDE ARPT. RADAR WAS OTS.

Narrative: THE FOLLOWING EVENT TOOK PLACE OCT/XA/97 AT AB22. THE LOCATION OF THIS INCIDENT WAS ESTIMATED TO BE 5 NM S OF ISLA GRANDE ARPT, OR ABOUT 1 NM S OF PATTY (SJ) LOM AT 1500 FT MSL. I WAS PIC OF ACFT ON FINAL FOR SJU RWY 10. THE OTHER ACFT INVOLVED WAS A BRITTEN NORMAN TRI- ISLANDER. FLT WAS CONDUCTED UNDER VFR RULES AND CONDITIONS, AND THE ALTIMETER SETTING WAS 29.99 INCHES OF MERCURY. THE FLT CONDITIONS AT THE TIME OF THE INCIDENT WERE CAVU. I WAS ON A 080 DEG HDG, BTWN THE 2 LOCS OF SJU IN A DIRECT COURSE FOR THE ARPT. THE FLT WAS ON ITS FINAL LEG RETURNING FROM PONCE TO SJU, AND AFTER LEVELING OFF AT 1500 FT I PROCEEDED TO COMPLETE THE BEFORE LNDG CHKLIST. AFTER COMPLETING THE BEFORE LNDG CHKLIST I LOOKED OUTSIDE MY L WINDOW TO MY 9 O'CLOCK POS TO BEGIN AN OUTSIDE SCAN FROM L TO R. TO MY SURPRISE, WHEN LOOKING AT MY 11 O'CLOCK POS, THERE WAS A BRITTEN NORMAN TRI- ISLANDER TURNING TOWARD ISLA GRANDE ARPT IN WHAT LOOKED LIKE A R BASE FOR RWY 9 AT ISLA GRANDE ARPT. I HAVE ESTIMATED THE SEPARATION BTWN BOTH ACFT TO BE 200 FT HORIZ SEPARATION AND 100 FT VERT SEPARATION. THE ACFT HAD ALREADY CROSSED MY FLT PATH FROM MY R TO MY L. AT THIS TIME NO EVASIVE ACTION WAS NECESSARY. NO INJURIES OR DAMAGE RESULTED FROM THIS INCIDENT. MY PAX, SEATED TO MY R, TOLD ME THAT HE HAD SEEN THE OTHER ACFT AND EVEN WHEN HE THOUGHT THAT IT WAS CLOSER THAN NORMAL DID NOT SAY ANYTHING BECAUSE HE BELIEVED THAT I HAD THE ACFT IN SIGHT. I NEVER HEARD THE OTHER ACFT ON TWR FREQ. FACTORS THAT INFLUENCED THIS INCIDENT ARE THAT BOTH ACFT WERE ON DIFFERENT FREQS, I WAS TALKING TO SJU TWR AND THE OTHER ACFT WAS TALKING TO SJU APCH, THE SJU ASR WAS DOWN FOR MAINT AFTER A COUPLE OF FAILURES DURING THE PAST FEW MONTHS. ALSO, THE FACT THAT MY PAX DID NOT ADVISE WHEN HE SAW THE OTHER ACFT AND THOUGHT IT WAS A LITTLE CLOSE TO US. I SHOULD ALSO MENTION THE TIME I SPEND (ABOUT 30 SECONDS) LOOKING INSIDE THE COCKPIT TO COMPLETE A CHKLIST WITHIN 5 MI OF THE DEST ARPT. I ELECTED NOT TO ADVISE THE TWR OF THE INCIDENT UNTIL I WAS SAFELY ON THE GND, WHERE I CALLED THE TWR TO INFORM THE INCIDENT. AN INVESTIGATION IS UNDER WAY TO FIND OUT WHERE THE SYS FAILED SO THAT ANOTHER ENCOUNTER LIKE THIS ONE CAN BE PREVENTED.

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.