Narrative:

We were making an ILS approach/landing to islip. We were to maintain 2000 ft until intercept then cleared for ILS 24 approach and to contact tower. We checked on with tower and they advised us to continue the approach. At approximately 1440 ft (before the OM and on GS and on localizer) tower issued us a low altitude alert. Although we were on GS and on localizer (its frequency verified) we elected to be prudent and execute a go around. The go around was routine. We shot another ILS 24 approach to islip. The clearance and approach was almost identical including receiving the low altitude alert at the same place. We crosschecked altimeters including the radio altimeter. They were the same. About 40 seconds later we crossed the marker we then were able to verify where we were including xchking altimeters, radio altimeter with the approach plate altitudes. At that point we continued and landed uneventfully. On the ground we were informed the low level warning happens often at islip and that ATC equipment is 'too sensitive.' this situation could cause a pilot to ignore a valid low level warning, while thinking it's ATC's sensitive equipment. This jeopardizing the safety of flight. The next week I returned to islip. Shot the same approach in similar WX on autoplt and received the same warning from the tower with similar explanation from them.

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Original NASA ASRS Text

Title: ACR MLG RECEIVED A FALSE MSAW FROM ISP TWR WHILE IMC ON ILS APCH TO RWY 24.

Narrative: WE WERE MAKING AN ILS APCH/LNDG TO ISLIP. WE WERE TO MAINTAIN 2000 FT UNTIL INTERCEPT THEN CLRED FOR ILS 24 APCH AND TO CONTACT TWR. WE CHKED ON WITH TWR AND THEY ADVISED US TO CONTINUE THE APCH. AT APPROX 1440 FT (BEFORE THE OM AND ON GS AND ON LOC) TWR ISSUED US A LOW ALT ALERT. ALTHOUGH WE WERE ON GS AND ON LOC (ITS FREQ VERIFIED) WE ELECTED TO BE PRUDENT AND EXECUTE A GAR. THE GAR WAS ROUTINE. WE SHOT ANOTHER ILS 24 APCH TO ISLIP. THE CLRNC AND APCH WAS ALMOST IDENTICAL INCLUDING RECEIVING THE LOW ALT ALERT AT THE SAME PLACE. WE XCHKED ALTIMETERS INCLUDING THE RADIO ALTIMETER. THEY WERE THE SAME. ABOUT 40 SECONDS LATER WE CROSSED THE MARKER WE THEN WERE ABLE TO VERIFY WHERE WE WERE INCLUDING XCHKING ALTIMETERS, RADIO ALTIMETER WITH THE APCH PLATE ALTS. AT THAT POINT WE CONTINUED AND LANDED UNEVENTFULLY. ON THE GND WE WERE INFORMED THE LOW LEVEL WARNING HAPPENS OFTEN AT ISLIP AND THAT ATC EQUIP IS 'TOO SENSITIVE.' THIS SITUATION COULD CAUSE A PLT TO IGNORE A VALID LOW LEVEL WARNING, WHILE THINKING IT'S ATC'S SENSITIVE EQUIP. THIS JEOPARDIZING THE SAFETY OF FLT. THE NEXT WK I RETURNED TO ISLIP. SHOT THE SAME APCH IN SIMILAR WX ON AUTOPLT AND RECEIVED THE SAME WARNING FROM THE TWR WITH SIMILAR EXPLANATION FROM THEM.

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.