A C208 ATX PLT PERFORMS AN ILLEGAL CONTACT APCH FROM CLL TO CFD; TX.

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I FLY FOR A PART 135 CARGO OP. THE ARPT (CFD) THAT I NORMALLY FLY INTO DOES NOT HAVE AN APPROVED SOURCE OF WX RPTING THEREFORE I CANNOT FLY THE INST APCH PROC FOR CFD; WHILE UNDER PART 135; UNLESS I CAN OBTAIN A PIREP. IN THIS SIT; I NORMALLY FLY AN APCH INTO CLL ARPT ON THE OTHER SIDE OF TOWN. IF THE WX IS GOOD ENOUGH I WILL PROCEED VISUALLY TO CFD AFTER GETTING UNDERNEATH AT CLL. ON THE MORNING IN QUESTION; I FLEW THE ILS RWY 34 AT CLL AND I THEN REQUESTED A CONTACT APCH INTO CFD FROM CLL. THIS IS AN INCORRECT USE OF A CONTACT APCH. I HAD SOME TROUBLE WITH ATC DOING THIS AND DECIDED TO CHK UP AGAIN ON THE PROC. IN THE AIM SECTION 5-4-24 IT STATES THAT A CONTACT APCH IS NOT TO BE USED TO GET UNDERNEATH THE CEILING AT 1 ARPT AND THEN PROCEED TO ANOTHER WHICH IS EXACTLY WHAT I DID. A CONTACT APCH IS BASICALLY A VISUAL APCH IN LESS THAN VFR CONDITIONS EXECUTED BY KEEPING 'CONTACT' WITH TERRAIN FEATURES TO NAV TO THE ARPT. IT CAN ONLY BE DONE AT AN ARPT THAT HAS AN APPROVED INST APCH PROC. THERE MUST BE AT LEAST 1 MI VISIBILITY AND THE PLT MUST BE ABLE TO MAINTAIN CLR OF CLOUDS. THE PROC IS EXECUTED UNDER IFR. MANY OTHER PLTS THAT I HAVE TALKED TO HAVE EXPRESSED A LACK OF UNDERSTANDING OF WHAT A CONTACT APCH IS AND HOW IT SHOULD BE PROPERLY EXECUTED. I BELIEVE THAT MOST PLTS HAVE AN INCOMPLETE CONCEPT OF WHAT A CONTACT APCH IS AND HOW TO DO IT. THIS IS A PROC THAT SHOULD BE BETTER CLARIFIED TO INST PLTS WHO MAY HAVE NEED OF IT AT SOME TIME. IT IS DIFFICULT TO FIND CLR INFO ABOUT CONTACT APCHS ANYWHERE EXCEPT THE AIM SECTION MENTIONED ABOVE. MORE EMPHASIS ON THE PROC IN TRAINING WOULD HELP.