A MEL REQUIREMENT WAS NOT SATISFIED.

Narrative

DISPATCH RELEASE CONTAINED MEL FOR A HYD SYS LOW PRESSURE LIGHT INOP. I SIGNED THE RELEASE AFTER READING THE MEL REQUIREMENTS AND THEN FLEW THE ACFT FROM PHX TO MDW TO PHX WITHOUT INCIDENT. THE REQUIRED CTL CHK WAS ACCOMPLISHED BEFORE EACH FLT. IT WAS LATER DISCOVERED THAT 'A LINE HAD BEEN OMITTED FROM OUR FAA APPROVED MEL' AND THE ACFT SHOULD NOT HAVE BEEN FLOWN IF THE INOP LIGHT WAS CAUSED BY A PRESSURE SWITCH. THERE WAS NO WAY I COULD HAVE KNOWN ABOUT THIS ERROR IN THE MEL. I HAVE BEEN ADVISED THAT MAINT CTL AND THE FAA AGREED THAT IT WAS AN INADVERTENT OMISSION AND THAT NO ONE WAS AT FAULT FOR ALLOWING THE ACFT TO BE FLOWN. APPARENTLY THE LIGHT PROB WAS CONNECTED WITH A FAULTY SWITCH AND HAS BEEN REPAIRED. I DON'T KNOW WHAT ELSE I COULD HAVE DONE BECAUSE THE MEL STATED THAT DISPATCH WAS PERMITTED WITH AN INOP LIGHT. A NOTE HAS BEEN PLACED IN OUR PLT READ FILE EXPLAINING THE MEL CHANGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: WHILE THE RPTR WAS FLYING A PHX-MDW TURNAROUND; HIS ACR MAINT AND POI FOUND THAT THERE WAS A SENTENCE MISSING IN THE FAA APPROVED MEL THAT WOULD HAVE KEPT THE ACFT ON THE GND. AS THE FAA APPROVED THE MEL; THE FAA COULD NOT COME AFTER THE RPTR OR THE ACR WITHOUT PUTTING ITSELF ON RPT. THIS PART OF THE MEL HAS BEEN REWRITTEN TO CORRECT THIS OVERSIGHT. THERE IS A COPY OF THE MEL IN EACH ACFT AS WELL AS IN ACR MAINT AND DISPATCH.