A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE #3 ENG BLEED OVERHEAT TRIP SYS DEFERRED AS INOP AND THE HIGH STAGE BLEED VALVE NOT CLOSED IN CONFLICT WITH THE MEL.

Narrative

AT APPROX XA30 LCL WENT TO WORK ON THE ACFT WITH A #3 BLEED PROB. I HAD PREVIOUSLY BEEN TOLD ABOUT IT BY THE MAINT TWR AND ASKED FOR AN MEL REF. ARRIVING AT THE PLANE WITH A LIMITED AMOUNT OF TIME DUE TO THE OTHER WORK; I READ THE WRITE-UP AND MEL. THEN I TALKED TO THE CREW TO CLR UP SOME QUESTIONS I HAD. I THEN MADE AN INCORRECT DIAGNOSIS DUE TO 3 POSSIBLE FACTORS: 1) MY LACK OF KNOWLEDGE OF THIS SYS; 2) A RUSH TO MAKE SCHEDULE; AND 3) IMPROPER COM BTWN MYSELF; THE MAINT TWR AND THE CREW. TO THE BEST OF MY KNOWLEDGE THE ACFT ARRIVED AT ITS DEST FOR A MAINT VISIT AND THE PROB SHOULD BE TAKEN CARE OF. I DISCOVERED THE ERROR I MADE WHEN I READ THE DESCRIPTION AND OP SECTION IN THE MEL MANUAL TO FULLY UNDERSTAND MY ACTION AND SYS OPS AS IS MY HABIT BEFORE I WORK AN ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE #3 ENG OVERHEAT TRIP SYS WAS DEFERRED AS INOP BUT THE BLEED SYS WAS LEFT OPERATIVE. THE RPTR WAS LATER ADVISED THIS DEFERRAL WAS IN CONFLICT WITH THE MEL.