AN ACR BA31 CAPT FLEW BEYOND HIS ALLOWABLE LEGAL FLT TIME VERSUS HIS REST TIME WHEN HE AGREED TO BE RESCHEDULED.

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INADVERTENTLY ACCEPTED EXTENSION OF FLYING DUTY THAT EXCEEDED MAX ALLOWABLE HRS FLOWN FOR THE REST PERIOD I HAD. THIS TRIP USUALLY INCLUDES 5.4 HRS ON FIRST DAY AND 3.5 HRS SECOND DAY SCHEDULED FLYING; WITH AN 8 HR REST PERIOD. THIS TRIP WAS SHORTENED BY 2 LEGS ON SECOND DAY AND SCHEDULED THAT WAY. SCHEDULED TO 2.1 SECOND DAY. SCHEDULING ASKED ME ON MORNING OF SECOND DAY IF I WOULD FLY THOSE 2 LEGS THAT WE USUALLY FLY. AT THAT POINT; THE HRS THAT I'D FLOWN PLUS THE HRS THEY NOW WANTED ME TO FLY NOW EXCEEDED 9 HRS REQUIRING A MINIMUM OF 9 HRS REST; BUT I ONLY HAD 8 HRS REST. I DID NOT THINK THIS WOULD BE A REST PROB BECAUSE WE ARE NEARLY ALWAYS SCHEDULED FOR THOSE LAST 2 LEGS ANYWAY AND WE USUALLY EXCEED 9 HRS OF ACTUAL FLYING TIME AND THAT IS WITHIN LEGAL REST BECAUSE IT IS SCHEDULED FOR LESS THAN 9 HRS FLYING TIME AND 8 HRS REST. I OVERLOOKED THIS BECAUSE WE ALWAYS FLY EXACTLY THOSE FLTS WITH EXACTLY THAT REST PERIOD EVERYDAY; AND REMAIN LEGAL BECAUSE REST REQUIREMENTS ARE BASED ON SCHEDULED HRS FLOWN; NOT ACTUAL HRS FLOWN. HOW ONE CAN DO THE EXACT SAME THING TWICE AND BE CORRECT ONE TIME AND NOT CORRECT THE OTHER TIME DOES NOT SEEM CONSISTENT.