FLT DISPATCHED IN AN UNAIRWORTHY ACFT THAT WAS DECLARED AIRWORTHY BY MAINTENANCE DEPARTMENT.

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THIS ACFT WAS SCHEDULED TO BE AN LGT A BUT WAS SWITCHED SEVERAL TIMES TO AN LGT B. THIS ACFT ARRIVED SEVERAL HRS LATE WITH AN MEL ITEM CONCERNING AN INTERMITTENT PROB WITH THE CRUISE TRIM. THE ACFT WAS OPERATED SEVERAL LEGS PREVIOUS BY OTHER CREW MEMBERS WITH THIS SAME CONDITION. WHEN MAINT ISSUED A CORRECTIVE ITEM NUMBER TO ALLOW THE ACFT O CONTINUE OPERATION IN THIS STATE (OPEN MEL). THE NUMBER WAS REFERENCED TO AN LGT A. THE LGT A HAS NO FLT RESTRICTIONS WITH THIS PROB. THE LGT B (OF WHICH OURS BELONGS) DOES HAVE FLT RESTRICTIONS INVOLVED WHEN THE CRUISE TRIM IS INOP. SINCE THIS WAS REFERENCED TO AN LGT A; THERE WAS NO NOTE OF THE FLT RESTRICTIONS ON THE COMPUTER GENERATED DISPATCH RELEASE. THE FLT CREW HAD NO KNOWLEDGE OF THESE FLT RESTRICTIONS AND OPERATED THE ACFT UNDER THE NORMAL OPS SPECS OF THE FLT MANUAL. HAD THE ITEM BEEN REFERENCED PROPERLY BY HAVING IT LISTED UNDER AN LGT B; IT IS MY BELIEF THE FLT CREW WOULD HAVE HAD PROPER NOTIFICATION AND OPERATED THE ACFT ACCORDINGLY. SUPPLEMENTAL INFO FROM ACN 86422: THREE CREWS PRIOR TO MY FLT HAD FLOWN THIS ACFT AND NOT DETECTED ANY IRREGULARITY WITH THE CI. HAD I BEEN THE CAPT OF THE FIRST FLT AFTER THE ASSIGNING OF THIS OR ANY CI; MY PERSONAL POLICY WOULD HAVE BEEN TO RESEARCH THE MEL COMPLETELY PRIOR TO FLT. SOME POSSIBLE CONTRIBUTIONS TO NOT QUESTIONING THE CI MAY HAVE BEEN THE DAY'S ACTIVITY. WE (THE CREW) HAD BEEN SUBJECTED TO IRREGULAR OPS; RESCHEDULING AND REROUTING AND EXTENSIVE GND WAITS; AWAITING INBND ACFT FOR OUR FLT. THIS WAS THE LAST FLT OF THE DAY AND WE WERE TO BE EXCEEDING MAX ON DUTY CREW TIME. THERE WAS NO SIGNIFICANT WX TO CONTRIBUTE TO ANOTHER ABNORMAL CREW FATIGUE. SUBSEQUENT TO MY FLT THE ERROR WAS DISCOVERED. THE ACFT WAS TAKEN OUT OF SVC; REPAIRED AND RETURNED TO SVC IN MINIMUM TIME (3 HRS). WITH SO MUCH INFO BEING COMPUTER GENERATED HOW IS IT POSSIBLE FOR FLT CREWS TO PRACTICALLY CHK EVERY PIECE OF PAPER WE RECEIVE FOR COMPLETE VALIDITY? PARTICULARLY WHEN SO MUCH INFO IS NOT READILY AVAILABLE TO FLT CREWS.