AN MD88 HAD THE L REVERSER DEFERRED AS INOP DUE TO A LEAKING REVERSER ACCUMULATOR. THE MEL PROC TO PULL AND LOCK ACCUMULATOR LOW MESSAGE CIRCUIT BREAKER WAS ACCOMPLISHED BY THE FLC AND NOT BY THE MECH WHO SIGNED THE MAINT RELEASE.

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NEAR DEP TIME; FLC NOTICED THE L THRUST REVERSER 'ACCUMULATOR LOW' MESSAGE ILLUMINATED; AND CALL FOR MAINT. I CHKED THE ACCUMULATOR PRESSURE AND FOUND IT APPROX 50 PSI LOW (1000 PSI NORMAL). I SVCED THE ACCUMULATOR TO PROPER PRESSURE AND RECHKED THE 'LOW' MESSAGE. THE 'ACCUMULATOR LOW' MESSAGE WAS STILL ILLUMINATED. I DECIDED TO DEFER MAINT AND AVOID FURTHER DELAY (THE PRESSURE SWITCH REPLACEMENT WOULD TAKE TOO MUCH TIME) BY DEACTIVATING THE L THRUST REVERSER. DISPATCH APPROVAL IS REQUIRED; SO I CALLED OUR MD88 SYS MAINT COORDINATOR. AFTER GETTING APPROVAL TO DEFER (MCO) THE L THRUST REVERSER; I TOLD THE SYS MAINT COORDINATOR THAT I WAS AWARE THAT I HAD TO CHK THE REVERSER DOORS FOR BEING FULLY FAIRED AND CHK THE OVERCTR LINKS FOR BEING OVERCTR AND HAD TO PIN THE THRUST REVERSER CTL VALVE IN THE DUMP POS. I THEN ASKED OUR MD88 SYS MAINT COORDINATOR (WHO HAS A COPY OF THE MEL AT HIS DESK) IF THERE WAS ANYTHING ELSE I WAS REQUIRED TO DO FOR THIS DEFERRAL AND HE SAID NO; THAT I HAD IT ALL COVERED. I THEN PROCEEDED TO LOCK OUT THE L THRUST REVERSER; FEELING THAT I HAD BEEN GIVEN GOOD INFO. I COMPLETED THE JOB AND REQUIRED PAPERWORK AND LEFT THE ACFT TO DEPART ON ITS FLT. THE FLC DISCOVERED THE CIRCUIT BREAKER FOR THE L THRUST REVERSER 'ACCUMULATOR LOW' MESSAGE HAD NOT BEEN PULLED AND SECURED (PER THE MEL) AND OBTAINED A CIRCUIT BREAKER COLLAR FROM A PASSING MECH AND PULLED AND COLLARED THE 'ACCUMULATOR LOW' MESSAGE CIRCUIT BREAKER. THE FLT THEN DEPARTED. AN FAA INSPECTOR WAS ON BOARD (JUMP SEAT) AND HE WAS RIGHTFULLY DISPLEASED WITH THE OBVIOUS LACK OF PROPER PROCS (PULLING/SECURING THE CIRCUIT BREAKER); AND CALLED OUR MAINT COORDINATION CTR AT THE FLT'S DEST TO LET THEM KNOW HE WAS GOING TO PURSUE THE MATTER AGAINST ME.