ACR SMT SHOT NDB APCH WHICH IS NOT APPROVED IN THEIR OPERATIONS SPECIFICATIONS.

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ENRTE TO FRESNO; CA FROM ORANGE COUNTY; CA; WE GOT THE FRESNO ATIS INFO WITH A VISIBILITY OF 1 AND ONE HALF MI. NDB APCHS TO 29R SIDESTEPPING TO 29L WERE IN USE. SINCE NDB APCHS ARE NOT AUTH IN OUR OPS SPECS; WE REQUESTED THE VOR APCH. APCH SAID THERE WOULD BE A MINIMUM OF 30 MINS DELAY FOR THAT APCH SO THE CAPT ASKED FOR THE NDB APCH; EVEN THOUGH I SAID I DID NOT WANT TO DO AN UNAUTH APCH. NO FURTHER WX INFO WAS GIVEN TO US AND WE COMPLETED THE APCH AND LANDED. UPON REACHING THE GATE; AN FAA INSPECTOR WAS WAITING TO TALK TO THE CAPT. THE INSPECTOR SAID WE NEEDED 1 AND ONE HALF MI TO BEGIN THE APCH AND THAT WE ONLY HAD 1 MI. TEN MINS LATER WHEN WE TAXIED FOR TKOF; ATIS INFO WAS CURRENT. APPARENTLY; BTWN OUR 1ST CALL TO APCH WHEN WE SAID WE HAD ATIS INFO AND WHEN WE TAXIED OUT FOR TKOF. POSSIBLY NEXT ATIS INFO HAD A VISIBILITY OF 1 MI. ONE MI VISIBILITY IS ALL THAT IS REQUIRED FOR THE NDB 29R CIRCLE TO LAND IN CATEGORY B ACFT. I DON'T KNOW WHY THE INSPECTOR SAID THAT WE NEEDED 1 AND ONE HALF MI. I ALSO DON'T KNOW WHAT ELSE A SIC CAN DO WHEN THE PIC INSISTS ON DOING SOMETHING ILLEGAL WHEN HE KNOWS THE SIC DOES NOT APPROVE.