A LOW TIME EMB145 PIC FLIES WITH A LOW TIME FO IN VIOLATION OF THEIR AIRLINE MGMNT POLICIES AT ZZZ; US.

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I INADVERTENTLY FLEW 2 LEGS OF AN ACR SCHEDULE WHILE PAIRED WITH A FO THAT HAD LESS THAN 75 HRS. AS A NEW RESERVE CAPT; I WAS ASSIGNED TO REPLACE ANOTHER PLT WHO WAS GOING TO ARRIVE LATE FROM ANOTHER FLT. I PRINTED THE REQUIRED RELEASE AND FLT PLAN WHICH STILL INDICATED THE ORIGINAL CREW. I WAS THEN CONTACTED BY COMPANY CREW SCHEDULING AGAIN TO INFORM ME THAT I WAS TO SWAP FLTS WITH ANOTHER CAPT AS THE WX WAS POOR AT MY ORIGINAL DEST AND THE OTHER CREW MEMBER WAS NOT RESTR TO HIGH WX MINIMUMS (LESS THAN 100 HRS IN TYPE) AS I. AFTER I INFORMED HIM OF THE CHANGE; HE QUICKLY CHKED THE WX AGAIN (FROM THE COCKPIT WITH ACARS) AND WE SAW THAT THE FIRST CITY WAS ACTUALLY CLR AND HIS STATION WAS 1 MI VISIBILITY. WE ASSUMED THAT THE SCHEDULER WAS MIXED UP AND PHONED THEIR DEPT FROM THE GATE. AFTER CONSULTING WITH A SUPVR AND THE ORIGINAL SCHEDULER; THEY DOUBLECHKED ON THE REASON FOR THE SWAP AND DID NOT HAVE A CONCLUSIVE ANSWER TO OUR QUERY. THEY SPECIFICALLY CHKED FOR CREW PAIRING LEGALITY FOR MY ORIGINAL ASSIGNMENT AND IT WAS SETTLED THAT I WOULD CONDUCT THAT FLT. I USED THE FIRST RELEASE AND 'PEN & INKED' CHANGED THE CREW NAMES FROM THE COCKPIT AS I WENT IMMEDIATELY TO THE ACFT DUE TO THE LATENESS; NOW; OF THE DEP. THE FLT WAS CONDUCTED NORMALLY; AND ALSO THE RETURN LEG. DUE TO THE QUICK TURNAROUND AT THE OUTSTATION; I DID NOT LEAVE THE ACFT AND; THEREFORE; DID NOT SIGN IN TO A COMPUTER TERMINAL. AGAIN; DUE TO HASTE; I DID NOT NOTICE THE LOW FLT TIME THAT IS PRINTED AS A RUNNING TOTAL ON THE BOTTOM OF THE FLT RELEASE. I WAS INFORMED OF THIS ERROR THE NEXT DAY BY MY ACTING CHIEF PLT. WE DISCUSSED THE CHAIN OF EVENTS THAT ALLOWED THIS TO OCCUR; BESIDES MY OBVIOUS ERROR. CONCLUSIONS: 1) AS A NEW CAPT ON THIS ACFT TYPE; I WAS NOT COGNIZANT OF THE INEXPERIENCED CREW PAIRING REG. I SHOULD HAVE BEEN HABITUALLY CHKING THE FLT TIME OF EVERY FO THAT I WAS ASSIGNED. 2) THIS REG SHOULD BE GIVEN AS MUCH GRAVITY AS THE HIGH WX MINIMUMS FOR CAPTS (100 HRS) RULE WHICH IS SECOND NATURE TO ALL OF US. 3) SOMETHING HAPPENED WITH THE CREW SCHEDULING DEPT COMPUTER PROGRAM WHICH IS SUPPOSED TO ALERT THEM. I SUSPECT THAT DUE TO THE CONFUSION OF 3 SETS OF CREW MEMBERS AND THE HASTE OF LATE FLTS; THEY ENTERED THE INCORRECT CREW NAMES WHEN CHKING FOR LEGALITY OF THE PAIRING.