Narrative:

Company assured crews that aircraft was legal to fly with a known discrepancy. Upon further inspection after flight, the PIC discovered that the aircraft had exceeded its 15 hour MEL deferral limit.

Google
 

Original NASA ASRS Text

Title: AN ACR LTT CAPT FLEW AN ACFT THAT HAD EXCEEDED ITS MEL DEFERRAL LIMIT.

Narrative: COMPANY ASSURED CREWS THAT ACFT WAS LEGAL TO FLY WITH A KNOWN DISCREPANCY. UPON FURTHER INSPECTION AFTER FLT, THE PIC DISCOVERED THAT THE ACFT HAD EXCEEDED ITS 15 HR MEL DEFERRAL LIMIT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.