PA28 PLT ENTERED MHT CLASS C WITHOUT CLRNC.

Narrative

PA28-161 LEFT NASHUA ARPT (ASH) BOUND FOR SANFORD; ME (SFM). NASHUA EXTREMELY BUSY DUE TO SPECIAL EVENT. LONG DELAY IN ABILITY TO CONTACT CTLR (DUE TO RADIO TFC) FOR PERMISSION TO CHANGE FREQ TO MANCHESTER (MHT). UPON INITIAL CONTACT TO MANCHESTER APCH THERE WAS NO REPLY DUE TO CTLR CONVERSING WITH ANOTHER ACFT. PA28-161 CONTINUED ON COURSE WHEN CTLR WAS HEARD ADVISING OTHER ACFT OF INCURSION. REALIZING THE PA28-161 WAS THAT ACFT; APCH WAS CONTACTED IMMEDIATELY. CTLR REMINDED PLT OF CLASS C CLRNC RULES AND GAVE XPONDER CODE. ALL ATC INSTRUCTIONS WERE FOLLOWED TO EXIT OF AIRSPACE. INCURSION WAS ACCIDENTAL. PLT CONTINUED ON COURSE BELIEVING CLRNC EMINENT; BUT ATC DELAYS WERE PREVALENT. CORRECT PLT ACTION WOULD HAVE BEEN TO TURN AWAY FROM (MHT). PLT HAS INCREASED AWARENESS OF CONDITIONS IN HIGH TFC AREA AND FUTURE INCURSIONS WILL BE AVOIDED WITH APPROPRIATE ACTION. THIS WAS PLT'S SECOND FLT SOLO INTO THIS CLASS OF AIRSPACE. EXPERIENCE WILL INCREASE VIGILANCE AND ABILITY TO PREVENT FURTHER OCCURRENCE.