LOW ALT CIVIL FLT. BELOW SFAR LIMIT.

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IN THE LAST FEW MONTHS WE HAD NO RAIN AND VERY LITTLE CLOUD COVER. I MADE CALLS TO FSS AND GOT THE WX AND RPT WAS BEAUTIFUL WX SO THE FLT WAS SCHEDULED XA00 AM. I DID THE VOLCANO HALF OF THE FLT AND HEADED AROUND THE N END OF THE ISLAND AND ENCOUNTERED BAD WX SO I DROPPED DOWN BELOW THE 1500 FT MINIMUM SET BY SFAR 71 TO SAFELY GET MY PAX BACK TO KONA ARPT. AS SOON AS THE WX IMPROVED; I RETURNED TO 1500 FT AGL. PLEASE REMEMBER THAT THE HAMALUA COAST OR THE NE SIDE OF THE ISLAND HAS NO WX RPTING SYS. AT THIS POINT; IT WAS BETTER FOR ME TO FINISH THE FLT THAN TO TURN AROUND. FUEL IS A BIG CONCERN WHEN THERE ARE VERY FEW FUEL STOPS. I KNOW THAT WHAT WAS DONE WAS NOT DANGEROUS; BUT THIS SFAR 71 DOES NOT ALLOW FOR REASONING FOR A PLT TO MAKE GOOD AND SAFE JUDGEMENT. IT ONLY WORRIES THE PLT TO OBEY IN FEAR OF LOSING HIS OR HER LICENSE WHEN WE SHOULD BE WORRYING ABOUT THE FLT; SAFE LNDG SPOTS; SEPARATION OF ACFT AND INSTS. THIS LAW WAS NEVER THOUGHT OUT AND PROPERLY STUDIED ON THE WX PATTERNS HERE IN HAWAII.