AN ACR B727 FLC MAKES A CIRCLE-TO-LAND APCH WITH THE RPTED VISIBILITY BELOW THEIR REQUIRED MINIMUMS. THEIR ACR DOES NOT TRAIN FOR CIRCLE-TO-LAND APCHS SO THEIR MINIMUMS ARE 1000 FT CEILING AND 3 MI VISIBILITY.

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ILS TO LGA RWY 22 WAS INOP. ALL OTHER APCHS COULD NOT BE USED BECAUSE OF 'JFK AND EWR RWY CONFIGNS' SO THE LDA-A TO RWY 22 WAS IN USE. I WAS ON THE JUMP SEAT AND NOT AN ACTIVE CREW MEMBER. THE FIRST CALL TO APCH GAVE US A VISIBILITY OF 2 MI (2 1/4 MI REQUIRED FOR OUR CAT D). BUT AFTER HOLDING INSTRUCTIONS; ETC; WE WERE SUCKERED INTO THE APCH. WHEN APCH CTL CALLED THAT THERE WAS NOW 2 1/2 MI VISIBILITY AT LGA; THE CREW RESPONDED BY HDG FOR THE APCH AS IT NOW WAS ABOVE THE PUBLISHED MINIMUMS. HOWEVER; SINCE OUR AIRLINE DOES NOT REQUIRE TRAINING ON CIRCLE-TO- LAND MANEUVERS; WE ARE REQUIRED TO HAVE 1000 FT CEILING AND 3 MI VISIBILITY. THE CREW PROCEEDED TO LGA AND LANDED. WE HAD THE ENTIRE RWY CLRLY IN SIGHT AT 4 1/2 MI SO WE DID HAVE THE REQUIRED VISIBILITY (PLATE) INFLT; BUT NOT 3 MI. I THINK THAT THE BEST VISIBILITY RPT THE CREW GOT WAS 2 1/2 MI. ONCE WE WERE ON THE GND; WE ALL REALIZED THE MISTAKE; BUT IN THE HEAT OF THE APCH; NOBODY REMEMBERED THE 1000 FT AND 3 MI RULE -- JUST CHKING THE APCH PLATES WAS NOT GOOD ENOUGH. WE NOW HAVE SO MANY 'EXEMPTIONS' AND 'WAIVERS' TO OUR OPS THAT IT IS VERY EASY TO FORGET OR MISS ONE OF THESE RULES IN THE HEAT OF BATTLE. IT WOULD ENHANCE SAFETY TO HAVE ALL ACR APCH PLATES WITH ONLY THE CORRECT INFO THAT CAN BE GLANCED AT QUICKLY AND HAVE THE NECESSARY SAFETY INFO READILY AVAILABLE.