COMMUTER LTT CONTINUED TO OPERATE WITHOUT COMPLYING WITH MEL REQUIREMENT. THE AUTO COARSEN SYS WAS INOP.

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1 TKOF ABANDONED FOR AUTO COARSEN LIGHT FAILURE AT DFW SYS SUBSEQUENTLY DEFERRED PER MEL. NO RESTRICTIONS FOUND IN ACFT DOCUMENTS TO LIMIT TKOF PERFORMANCE. ACFT PERFORMED 5 TKOFS BEFORE CREW MADE AWARE OF SEVERE PERFORMANCE LIMITATIONS WITH AUTO COARSEN INOPERATIVE. (AFTER LNDG AT DFW; TX). I DO NOT CONSIDER THAT THE COMPANY HAS ADEQUATELY TRAINED IN THE USE OF PERFORMANCE CHARTS; ESPECIALLY THOSE DEALING WITH NON STANDARD CONFIGNS. ACCORDINGLY; I AM REQUESTING IMMEDIATE FURTHER GND TRAINING FOR MYSELF AND OPS WIDE (PLTS AND DISPATCHERS AND MAINT) EMPHASIS ON THE LIKELY SEVERITY OF ACFT PERFORMANCE LIMITATION WITH CERTAIN SYSTEMS INOPERATIVE. THIS TO PREVENT THE POSSIBILITY OF REPETITION NOT JUST BY MYSELF BUT BY ANY OTHER CREW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. THE AUTO COARSEN SYS IS AN AUTO FEATHER SYS AND WHEN INOP IT CARRIES A LARGE GROSS WT PENALTY. CAPT SAID THAT WITHIN HOURS OF THE ERROR BEING DISCOVERED ALL ACFT WERE SUPPLIED WITH ADEQUATE DOCUMENTATION. THE PROBLEM CAME TO LIGHT AT A MORNING OP REVIEW THAT IS MONITORED BY THE FAA. THE CAPT AND THE FO WERE GIVEN ADDITIONAL TRAINING DIRECTED AT BETTER UNDERSTANDING OF ACFT PERFORMANCE AND THE DETERMINATION OF GROSS WT LIMITS. THE ENTIRE INCIDENT IS VIEWED IN A POSITIVE LIGHT AS A GOOD LEARNING EXPERIENCE.