MD80 FLC OPERATED WITH OPEN MAINT WRITE-UP.

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LAST LEG OF OUR TRIP; LAX TO SEA. PLANE CHANGE. NORMAL DAY; FAIRLY FULL PLANE. FO AND I BOTH DOING PREFLT AND COCKPIT SETUP. REVIEWED LOGBOOK AND FOUND AN OPEN WRITE-UP; AND NO APPARENT ACTION FROM MAINT. (NORMALLY MAINT MEETS INBOUND ACFT TO REVIEW LOG.) I CALL OPS AND MAINT. MAINT ARRIVES; LOOKS AT WRITE-UP AND ITEM OF INTEREST (INOP PLACARD WHICH SHOULD HAVE BEEN REMOVED WITH INSTALL OF GPS EQUIP) AND LEAVES WITH LOGBOOK. WE WAIT FOR HIS RETURN AS WE ARE NOW READY TO DEPART. HE RETURNS; PLACARD IS REMOVED; LOGBOOK IS SIGNED OFF. I REVIEW HIS SIGN-OFF AND PUT LOGBOOK AWAY; CLOSE DOOR AND DEPART. (10 MIN DELAY.) UNEVENTFUL FLT TO SEA. ARRIVE SEA AND HAND LOG TO WAITING MAINT. FO AND I GATHER OUR BAGS AND DEPLANE AFTER PAX ARE GONE. AS WE PASS MAINT IN THE JETWAY; HE IS APPARENTLY REVIEWING A WRITE-UP; BUT I DIDN'T WRITE ANYTHING UP. OH NO; A SECOND WRITE-UP (ON ANOTHER PAGE) WAS APPARENTLY BEHIND THE ONE WE DISCOVERED EARLIER. WE HAD JUST FLOWN A LEG WITH AN OPEN WRITE-UP! (THE WRITE-UP CONCERNED THE LNDG GEAR WARNING HORN ACTIVATION SPD.) THE CONTRIBUTING FACTORS SEEM TO HAVE BEEN: THE FACT THAT MAINT DID NOT MEET THE INBOUND ACFT TO REVIEW THE LOG INITIALLY IN LAX. MY REVIEW OF THE LOG DURING PREFLT REVEALING AN 'UNDEALT WITH' OPEN WRITE-UP. IMMEDIATE ACTION TO CORRECT THIS PROVIDED A DISTR FROM FINDING THE SECOND WRITE-UP. PRESSURE TO GET THE NOW LATE FLT OUT WITHOUT FURTHER DELAY SO AS TO ARRIVE IN SEA ON TIME. MAINT HAVING THE LOG THE REMAINDER OF THE TIME ON THE GND AND NOT CATCHING THE SECOND WRITE-UP. A REALLY AWFUL MAINT/LOGBOOK SYS. I JUST PLAIN MISSED IT! CORRECTIVE ACTIONS WILL BE 2-FOLD. FOR ME: I WILL NEVER RUSH THROUGH THE LOG ON PREFLT AGAIN; IF THE FLT IS LATE OR NOT. I WILL USE MY GOOD HABIT OF FOLDING OVER THE USED PAGES AND EXPOSING A 'CLEAN' PAGE BEFORE CLOSING THE LOG AND STOWING IT. FOR THE COMPANY: A COMPLETELY REDESIGNED MAINT LOG SYS IS CURRENTLY UNDER REVIEW.