SMA FLIES ABOVE 10000 FT WITH NO OPERATING XPONDER.

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FILED FLT PLAN USING 11500 FT WITH ACFT THAT DID NOT HAVE AN OPERATING AND CURRENT XPONDER. I DISCOVERED MY ERROR YESTERDAY WHILE REVIEWING AN AOPA AIRSPACE REF CARD; WHICH I MIGHT ADD IS VERY WELL DONE AND EASY TO UNDERSTAND. CONTRIBUTING FACTORS: LONG TIME SINCE I HAD MADE SUCH A FLT UNDER THESE PARAMETERS AND WHILE I DO REVIEW FARS FROM TIME TO TIME; I MISSED THE CHANGE REQUIRING MODE C XPONDERS ABOVE 10000 FT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT IN RETROSPECT HE REALIZED THAT NO ONE ELSE HAD PICKED UP ON HIS MISTAKE EITHER. FSS DID NOT CATCH THE ERROR WHEN FLT PLAN FILED. NO CTLR ALONG THE WAY SAID ANYTHING TO HIM ABOUT ERRONEOUS ALT WITH NO XPONDER. DOES NOT KNOW HOW HE MISSED THE 10000 FT ALT CHANGE. HAS NEVER FLOWN AN ACFT WITHOUT A WORKING XPONDER SO IT WAS NEVER BEFORE A QUESTION. SINCE KNOWING THE REG HE HAD NOT FLOWN ABOVE 10000 FT AND WILL NOT UNTIL HE GETS HIS XPONDER INSTALLED AGAIN. FILED RPTS MAINLY TO INDICATE HOW EASILY THINGS CAN SLIP BY A PLT AS HE HAS HAD 2 BFR'S AND INFO NEVER KNOWN TO HIM.