PA28 PLT GIVEN RWY CHANGE ON APCH. HE COMPLIES BUT THEN IS INFORMED THAT HE SHOULD HAVE CONTACTED TWR ON ANOTHER FREQ FOR CLRNC. LAND WITHOUT CLRNC.

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AS PIC; I HAD RECEIVED CLRNC FROM TWR TO TURN FINAL FOR RWY 25L. AFTER ALIGNING THE AIRPLANE FOR RWY 25L; REDUCING MY AIRSPD AND LESS THAN 60 SECONDS FROM TOUCHDOWN; I RECEIVED INSTRUCTIONS FROM THE TWR TO SWITCH TO RWY 25R. I ACKNOWLEDGED TWR'S REQUEST TO SWITCH TO RWY 25R; QUICKLY TURNED BASE THEN TURNED FINAL AND LANDED. VIOLATION: AFTER LNDG ON RWY 25R; I WAS INFORMED BY TWR THAT I HAD NOT RECEIVED CLRNC TO LAND ON RWY 25R AND WAS INSTRUCTED FIRST TO CHANGE RWYS AND THEN TO MAKE FREQ CHANGE FOR CLRNC TO LAND ON RWY 25R. RECOMMENDATION: ANY ACFT THAT IS REQUESTED TO CHANGE RWYS AFTER RECEIVING PRIOR CLRNC AND IS LESS THAN 60 SECONDS FROM TOUCHDOWN; SHOULD AUTOMATICALLY BE CLRED FOR THE NEW INSTRUCTED RWY. CONCLUSION: PLTS ARE EXTREMELY BUSY IN THE LAST 60 SECONDS BEFORE TOUCHDOWN AND SHOULD NOT BE DISTR BY CHANGING FREQ AND ESTABLISH COMS WITH TWR AFTER BEING INSTRUCTED TO CHANGE RWYS. IF I HAD NOT MISSED THE REQUEST TO CHANGE FREQ AT THE TIME I WAS INSTRUCTED TO CHANGE RWYS; I WOULD HAD REQUESTED A GAR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THE ACCIDENT PREVENTION INVESTIGATOR FROM THE LGB FSDO SPOKE WITH HIM AND WAS VERY CORDIAL. HE LISTENED TO THE TAPES OF THE INCIDENT AND AGREED THAT LGB TWR HAD SOME PROBS. HE INDICATED THAT THE CTLR WAS GIVEN A 'SLAP ON THE WRIST.' HOWEVER RPTR WAS MADE TO TAKE 2 HRS OF HIS TIME AND SPEND THE MONEY TO FLY IN ORDER TO REMAIN FREE OF A VIOLATION. RPTR WAS FURIOUS BUT DID COMPLY BECAUSE HIS WORK REQUIRES HIM TO TRAVEL A GREAT DEAL AND HE DOES NOT HAVE THE TIME TO FIGHT THE FAA. HE FEELS THAT THE PROC USED WAS VERY UNSAFE AND HE WAS MERELY TRYING TO HELP THE CTLR WHO HAD CLRED ANOTHER ACFT FOR THE SAME RWY. HE WAS FLYING AN ARCHER.