SMA PLT WAS NOT SURE IF HE HAD AN IFR CLRNC OR WHETHER HE HAD CLRNC TO ENTER DAY CLASS C.

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ON A BREAKFAST FLYOUT TO BLUFFTON; OH (5G7) I FLEW THE RETURN TO DAYTON WRIGHT BROTHERS (MGY). I HAD DECIDED TO FLY IFR FOR CURRENCY. ON OUR ARR AT 5G7; THE WX WAS CLR WITH ABOUT 6 MI VISIBILITY. WHEN WE WERE ABOUT TO DEPART AFTER BREAKFAST; THE SKY CONDITION HAD CHANGED TO A THIN OVCST WITH A CEILING OF ABOUT 2500-3000 FT. SO; I DECIDED TO DEPART VFR AND ASK FOR AN IFR CLRNC WITH DAYTON APCH CTL; WHICH I DID. THE CLRNC REQUEST WAS FOR A LOW APCH AT DAYTON FOLLOWED BY A FINAL LNDG AT MGY. I WAS WEARING A HOOD AND HAD A SAFETY PLT; BUT I REMEMBER SPECIFICALLY REQUESTING AN 'IFR CLRNC' DUE TO THE OVCST CONDITION. THE ATIS AT DAYTON WAS INDICATING GOOD VFR WITH A SKY CONDITION OF 15000 FT SCATTERED. THE CTLR ACKNOWLEDGED MY REQUEST AND I WAS TOLD TO EXPECT THE APCH FOR RWY 24L AND REMAIN VFR. I ASSUMED THAT WOULD BE TEMPORARY AND AWAITED MY CLRNC. AFTER ABOUT 2 MINS; NO CLRNC WAS FORTHCOMING; SO I REQUESTED 4000 FT THINKING THAT WOULD HELP EMPHASIZE THAT THE REQUEST WAS FOR AN IFR CLRNC. THE CTLR AUTH 4000 FT; BUT RESTATED THE VFR RESTR. I CHKED THE FLT SKY CONDITION AND DETERMINED THAT THE FLT SKY CONDITION HAD ABATED SOMEWHAT AND THAT WE COULD MAINTAIN VFR AT 4000 FT. AT THIS POINT IT BECAME OBVIOUS THE CTLR HAD ASSUMED THAT I HAD REQUESTED A PRACTICE APCH UNDER VFR. AS THIS WAS BEING STRAIGHTENED OUT; THE CTLR FINALLY GAVE ME A CLRNC STATEMENT THAT BYPASSED DAYTON AND PROVIDED ONLY FOR A LNDG AT MGY. AFTER MORE INTERCHANGES; WE FINALLY AGREED ON AN IFR CLRNC FOR THE FLT AS PLANNED AND I COMPLETED THE CURRENCY FLT WITH A LNDG AT MGY. THROUGHOUT THE EVENT; THE ASSIGNED SQUAWK CODE WAS UNCHANGED AT XD06. PROBABLY CONTRIBUTING TO THE PROB WAS ANOTHER ACFT ON FREQ WITH A SIMILAR SOUNDING IDENT. OURS WAS XYZ AND THEIRS WAS YXZ. THE OTHER ACFT WAS A TWIN CESSNA AND IT APPEARED IT WAS SHOOTING PRACTICE APCHS FOR RWY 24L. I BELIEVE THAT THE PROB WAS MOSTLY CAUSED BY THE FAILURE OF THE CTLR TO DISTINGUISH OUR REQUEST FOR AN IFR CLRNC FROM A VFR CLASS C ENTRY CLRNC FOR PRACTICE APCHS AND THAT MAY HAVE BEEN INFLUENCED BY THE VFR WX CONDITIONS AT HIS LOCATION. THE PROB COULD HAVE BEEN AVOIDED ALTOGETHER IF I HAD SIMPLY FOLLOWED NORMAL IFR PROC AND FILED AN IFR FLT PLAN ON THE GND. SINCE I HAD A CELL PHONE; THIS COULD HAVE BEEN ACCOMPLISHED EVEN AT THE AIRPLANE. THE 'POP-UP CLRNC' CAN GREATLY IMPROVE THE UTILITY OF THE AIRPLANE; BUT HAS THE POTENTIAL FOR PROBS AND RELIES TOO MUCH ON THE OFTENTIMES SUBTLE USE OF STANDARD TERMINOLOGY. THE CURRENT TERMINOLOGY GUIDANCE SEEMS TO REQUIRE THE MULTIPLE USE OF THE WORD 'CLRNC.' IN THIS EXAMPLE; IT HAS THE DUAL MEANING OF PERMISSION TO ENTER CLASS C AIRSPACE OR PERMISSION TO OPERATE IFR. IN ADDITION; THE WORDS 'PRACTICE APCH' SEEM TO MEAN OPERATE VFR; BUT IT APPEARS NOT EVERYONE COMPLIES WITH THIS USAGE SO THAT CTLRS MUST MAKE AN ASSUMPTION ON WHAT IS REALLY REQUESTED WHEN THE WORDS 'PRACTICE APCH' HAVE NOT BEEN STATED. MY EXPERIENCE IS THAT GOOD CTLRS ASK FOR CLARIFICATION WHENEVER THERE IS THE OPPORTUNITY FOR MISUNDERSTANDING. AS FOR THE PLT MAKING THE REQUEST; I WOULD LIKE TO SEE RECOMMENDED TERMINOLOGY WHICH IN EFFECT ELIMINATES THIS OPPORTUNITY FOR ERROR. RELYING ON THE OMISSION OF THE WORDS 'PRACTICE APCH' TO MEAN OPERATE ON AN IFR CLRNC IS NOT REALLY SATISFACTORY. ANOTHER SOLUTION PERHAPS; MIGHT BE A UNIVERSAL RESERVATION OF A SQUAWK CODE SERIES 1XXX (OR 12XX) FOR ALL PRACTICE APCHS. THIS WOULD TEND TO HELP THE CTLR AND PLT REACH THE REQUIRED LEVEL OF UNDERSTANDING. IF THIS CONVENTION WERE IN PLACE; I WOULD HAVE KNOWN IMMEDIATELY THAT THE CTLR HAD NOT GOTTEN MY FULL INTENTION FOR AN IFR OP.