A FOKKER 100 CAPT RPTS INADEQUATE LOGBOOK REVIEW AND PLACARDING BY MAINT PRIOR TO DEFERRAL OF CRITICAL SYS.

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ARRIVED AT ACFT; REVIEWED LOGBOOK; FOUND APU PLACARDED INOP PER 49-XX. AFTER REVIEW OF MEL AND LOGBOOK; FOUND RECENT HISTORY ON IDG #1. IT HAD BEEN PLACARDED INOP WITH REMOVAL OF PLACARD JUST 1 DAY EARLIER. NOTE M UNDER 49-XX STATES FOR A MAINT PLACARD THAT A REVIEW OF RECENT HISTORY OF THE IDG'S MUST BE ACCOMPLISHED. MAINT AND THE MAINT COMPUTER FAILED TO CATCH THE RECENT HISTORY OF A PROB AND THE PLACARD WAS PLACED ON THE ACFT JUN/XA/01. CALLED YYY TECHNICIAN AND BROUGHT IT TOO THEIR ATTN AND HE DECIDED ACFT MUST COME OTS. I CONCURRED WITH THAT DETERMINATION AND ANOTHER ACFT WAS USED FOR THE FLT. FOUND ANOTHER IMPROPER PLACARD THE WK PRIOR AND THIS SEEMS TO BE A SYSTEMIC PROB. THE COMPUTER SHOULD NOT BE ALLOWING THIS TO HAPPEN AND AN EXPLANATION OR EXCUSE IS NOT ACCEPTABLE. SEEMS THAT THERE IS ONLY 1 LEVEL OF PROTECTION WITH THIS SYS AND NOWHERE IN AVIATION IS ONE LAYER OF PROTECTION FOUND TO BE ACCEPTABLE. FAA HAS STATED AN INTENT TO PUNISH CREW MEMBERS THAT MISS IMPROPER PLACARDS WHILE THE SYSTEMIC PROB GOES UNADDRESSED. THIS DOES NOT SEEM TO ME TO BE ACCEPTABLE OR EFFECTIVE IN CORRECTING THE PROB TO ME.