MDT FLC GETS MEL INFO TO FLY WITH INOP TAXI LIGHT; LNDG LIGHT. WRONG INFO.

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ON TAXIOUT WE DETERMINED THAT THE L TAXI AND THE R LNDG LIGHTS WERE INOP. AFTER CONCLUDING OUR TAXI CHKLIST I ASKED MY FO IF HE WOULD NOTIFY GND THAT WE WOULD LIKE TO PULL OFF TO THE SIDE FOR A MOMENT TO CALL MAINT. I POINTED OUT THAT; ALTHOUGH HE NEEDS EXPERIENCE DOING DEFERRALS LIKE THIS; (HE WAS A NEW-HIRE PLT; ABOUT 2 WKS OUT OF IOE) I SUGGESTED THAT HE MONITOR COM 1 AND LISTEN IN ON ME. I THOUGHT THIS WAS THE BEST WAY; AT THE TIME. IT WAS OUR 5TH AND LAST LEG ON A DAY WITHOUT BREAKS. WE WERE GETTING TIRED AND I WAS THINKING THAT THIS WAS THE BEST WAY TO KEEP THE CONFUSION DOWN; HENCE LESSENING ANY CHANCE OF ERROR! I SHOULD HAVE MADE SURE WE DID IT TOGETHER; ALTHOUGH HE MIGHT GET SOMEWHAT BEHIND; HE HAS BEEN 'TRAINED' AND MAY HAVE HAD A PRODUCTIVE QUESTION OR COMMENT WHICH COULD HAVE PREVENTED WHAT WAS ABOUT TO HAPPEN. I RADIOED; 'MAINT CTL; ACFT' I TOLD HIM WHICH LIGHTS WERE OUT AND ASKED IF I COULD GET THEM DEFERRED. BY NOW I HAD THE ACFT'S MEL MANUAL BESIDE ME ABOUT TO LOOK UP THE NUMBERS. JUST THEN; MAINT CTL RADIOED BACK TO THE MEL NUMBERS; SO I DROPPED THE MEL MANUAL; (THINKING; THIS CONFIRMS WHAT I REMEMBERED; THAT WE CAN OPERATE WITH ONE OF EACH LIGHT INOP SO I WON'T NEED TO READ THE MEL -- NOT!) AND WROTE DOWN THE MEL NUMBERS; THE MECHS NAME AND A&P NUMBER. ON THE SAME FREQ; I THEN RADIOED DISPATCH; 'DISPATCH; 1:30' AND SAID SOMETHING LIKE 'YOU PROBABLY HEARD ALL THAT; COULD I GET A PEN AND INK NOW? I RECEIVED AN IMMEDIATE RESPONSE TO THE AFFIRMATIVE WITH THE APPROPRIATE 'Z' -- TIME AND HIS INITIALS. I MADE THE APPROPRIATE PEN AND INK CHANGE TO MY RELEASE; AND WE THEN RESUMED TAXI; AND DEPARTED. ONCE ALOFT AND OUT OF 10000 FT I GOT THE MAINT LOG BACK OUT AND FINISHED THE MEL PAPERWORK; STICKERS; AND READ FROM THE MEL MANUAL; THOSE MEL'S TO WHICH I HAD JUST BEEN ASSIGNED. I FOUND THAT THE MEL NUMBER ASSIGNED FOR THE TAXI LIGHT WAS FOR NAVIGATIONAL LIGHTS OR SYS; AND THE NUMBER FOR THE LNDG LIGHTS WAS FOR LNDG LIGHTS. AT THAT TIME I AGAIN RADIOED MAINT CTL AND ASKED THEM TO VERIFY THE TAXI LIGHT NUMBER. THE NUMBER HE RESPONDED WITH WAS THE NUMBER I PREVIOUSLY COPIED. I ASKED IF IT SHOULDN'T BE MEL 'X;' WHICH I INDICATED IN MY MANUAL FOR TAXI LIGHTS. HE INSISTED HE WAS CERTAIN; BUT THEN ASKED WHAT REVISION I HAD. I TOLD HIM. HE THEN TOLD ME HE HAD THE PREVIOUS REVISION. HE ASKED ME TO STAND-BY. NEXT I HEARD HIM TALKING TO A LINE MECH EVIDENTLY ON THE GND IN ANOTHER OF OUR ACFT. HE ASKED THE MECH TO VERIFY WHICH REVISION HE HAD. DURING THEIR XMISSIONS; I HEARD MAINT CTL MENTION THAT I WAS 'ACFT 1:30;' WHICH I KNOW IS A BRASILIA. WHEN I WAS ABLE TO GET A WORD IN; AND CLARIFY THAT I WAS AN ATR; MAINT CTL DID VERIFY THAT THE NUMBERS HE ISSUED WERE INCORRECT; AND THAT THE NUMBERS I INDICATED WERE CORRECT. AT THIS POINT IT WAS APPARENT WE WERE ILLEGAL; AS THE ATR MEL SPECIFIES THAT WITH A LNDG LIGHT INOP BOTH TAXI LIGHTS MUST BE OPERATIVE FOR NIGHT-TIME OPS. THE FOLLOWING DAY MGMNT CALLED ME INTO THIS OFFICE TO TELL MY VERSION OF THIS SIT. IN THE MEETING THEY INFORMED ME THAT NOT ONLY DID THE MECH CONFUSE ME FOR ACFT 1:30; BUT DISPATCH ALSO FOLLOWED SUIT; THEREFORE; MY RELEASE AND MY DISPATCHERS RELEASES DID NOT AGREE. IN MY JUDGEMENT; THIS MESS; IS SIMPLY ONLY ANOTHER EXAMPLE OF HOW POOR THIS AIRLINE'S MAINT CTL; MAINT; AND DISPATCH ARE. I WOULD ALSO LIKE TO POINT OUT THAT THIS ACFT IS OPERATED UNDER FAR PART 121. SO; 135 VERSES 121 IS NOT ONLY A CTLING FACTOR; BUT ALSO HOW WELL RUN THE 121 OP IS. THIS ONE IS POOR! THIS AIRLINE'S MAINT OP HAS BEEN ALLOWED TO RUN SO FREELY THIS OCCURRENCE ABOVE IS ONLY A SMALL EXAMPLE! AS FAR AS MY PART IN THIS: I DEFINITELY WILL DO MY VERY BEST TO ALWAYS MAKE SURE I READ; SLOWLY; AND CAREFULLY MY MEL. P.S.: WHAT ABOUT THE ACFT PREFLT? YOU KNOW MAINT USED TO MEET ARRIVING ACFT TO PERFORM A PREFLT SO THAT AS WE TAXIED THE ACFT IN WE COULD TURN ON ALL OF THE LIGHTS SO THEY COULD VERIFY THEIR WORK. I CANNOT REMEMBER THE LAST TIME I SAW MAINT DO THAT. BUT EVERYDAY I SEE MAINT PERFORM PREFLTS.(MANY OF THE EXTERIOR LIGHTS CAN ONLY BE PWRED WHEN THE PROPS ARE TURNING. MAINT DOES NOT RUN THE ACFT DURING PREFLTS; AND THEY DO NOT HAVE AUX AC WILD PWR SOURCES. HMMMM!)