SMA ON FINAL RECEIVED GARBLED COM. SO STATES; THEN RECEIVES VERY CONFUSING LIGHT SIGNALS.

Narrative

I DEPARTED A LCL ARPT (WST/WESTERLY; RI) BOUND FOR GON (GROTON/NEW LONDON; CT). DEPARTING WST I CONTACTED PROVIDENCE APCH; AS LCL RULES DICTATE; TO REQUEST THE 'PRACTICE' ILS-5 APCH INTO GON. I WAS GIVEN RADAR VECTORS TO FINAL APCH AND ONCE 3.5 MI OUTSIDE OF PINET; THE FAF; I WAS CLRED FOR THE APCH AND TOLD TO CONTACT TWR. I CONTACTED TWR WHEN TOLD TO DO SO; AND TWR TOLD ME TO RPT PINET INTXN INBOUND. I ACKNOWLEDGED THIS REQUEST; AND THAT WAS THE TWR'S LAST UNDERSTANDABLE XMISSION. AT PINET I CONTACTED TWR AND HEARD 'GARBLE' AS A REPLY; SO I TOLD TWR THEY WERE 'GARBLED' AND 'UNREADABLE.' THIS OCCURRED TWICE; ONCE AT PINET AND ONCE APPROX 30 SECONDS LATER. I THEN UPDATED MY POS RPTS ON TWR FREQ APPROX EVERY MI; AND 'SHORT FINAL;' UNTIL TOUCHDOWN. PINET IS APPROX 6 MI OUT AND I TWICE RECEIVED LIGHT SIGNALS FROM TWR. THE SAME LIGHT SIGNALS WERE GIVEN TWICE. THE SIGNAL WAS A VERY QUICK GREEN FLASH FOLLOWED BY A VERY QUICK WHITE FLASH. 1 SIGNAL OCCURRED AT APPROX 5 MI OUT AND THE OTHER AT APPROX 3.5-4 MI OUT. WHEN I WAS APPROX 2 MI OUT; I REQUESTED A STEADY GREEN SIGNAL FROM TWR IF CLRED TO LAND. I NEVER RECEIVED ANY FURTHER ACKNOWLEDGEMENT. EVEN THOUGH I WAS NOT CLRED TO LAND PROPERLY FROM TWR; I DID LAND BECAUSE I WAS CONFUSED WITH TWR'S LIGHT GUN SIGNALS. THE ALTERNATING GREEN/WHITE IS NOT A SIGNAL KNOWN TO FARS OR LCL CUSTOM. I THEREFORE ASSUMED 1 OR 2 THINGS: THERE IS TFC AHEAD AND I SHALL GET A STEADY GREEN SHORTLY. -- OR -- I AM CLRED TO LAND. PROVIDENCE APCH WAS AWARE THIS WAS A FULL STOP AND I ASSUMED THIS INFO WAS PASSED TO TWR. LONG AND SHORT: THE TWR'S CONFUSING LIGHT SIGNALS MADE FOR A HECTIC SIT WHEN IT COULD HAVE BEEN HANDLED SMOOTHLY WITH PROPER LIGHT GUN SIGNALS.