A B767-300 TECHNICIAN WORKED AN EXTERIOR EMER LIGHT RPT AND AFTER 2 TESTS OF THE SYS SIGNED THE RPT AS TESTED OK; NO FAULT FOUND.

Narrative

I WAS ASSIGNED TO ACFT X. THERE WERE SEVERAL MECHS TENDING TO MAINT ISSUES ONBOARD. AFTER SETTING UP THE FLT DECK FOR A DOMESTIC (SFO) DEP; I LOOKED INTO A LIGHTING ISSUE. AVIONICS DOESN'T RE-LAMP PER SE; BUT WE HAVE BEEN KNOWN TO DO SO. I BECAME AWARE OF AN EXTERIOR EMER LIGHTING ISSUE AND FOLLOWED UP. MY FOLLOW-UP CONSISTED OF ACTIVATING THE LIGHTING SYS FROM THE FLT DECK FOR EVALUATION. AS I WALKED THROUGH THE CABIN; NO LIGHTING DISCREPANCIES WERE NOTED. I TURNED THE CIRCUIT OFF; AND BACK ON. WITH THE CIRCUIT ACTIVATED; I WALKED AROUND THE ACFT. I NOTICED NO EXTERIOR LIGHTING DISCREPANCIES. I WALKED BACK AROUND; THIS TIME IN A CLOCKWISE PATTERN. BACK IN THE COCKPIT; I SWITCHED OFF THE EMER LIGHTING CIRCUIT TO AVOID INDUCING A BATTERY PACK PROB. I LEFT THE CIRCUIT OFF FOR A FEW MINS. I CYCLED THE EMER LIGHTING CIRCUIT ON AND WENT BACK OUTSIDE; AND AGAIN DID A WALKAROUND INSPECTION FROM THE GND. HAVING COMPLETED MY WALKAROUND; I RETURNED TO THE FLT DECK AND SWITCHED OFF THE CIRCUIT. HAVING COMPLETED 2 VISUAL INSPECTIONS; NO DISCREPANCIES EXISTED. BY CYCLING THE SWITCH ON/OFF 2 CYCLES; EITHER THE BATTERY PACK CONNECTION(S) OR LAMP CONTACT CONNECTION IMPROVED. ALL EXTERIOR ASSEMBLIES WERE ILLUMINATED AND NONE WERE FLICKERING. I WAS AWARE THE SYS HAD PREVIOUS HISTORY. AS I FOUND NO DISCREPANCIES WITH REGARD TO EMER LIGHTING; IT IS MY DUTY TO SIGN OFF WITH ACTION TAKEN ON THE ITEM AS RELATED TO MAINT ENTRY #75. THIS IS A TRICKY SYS; AS LAMPS ARE KNOWN TO ILLUMINATE AND THEN NOT; INTERMITTENTLY. I FEEL THAT IF SOMEONE SAW THIS LAMP ASSEMBLY ON ACFT X HAD GONE INOP BEFORE DEP; IT WAS THEIR DUTY TO OPEN ANOTHER ITEM IN THE MAINT LOG. ANY OPEN ITEM WOULD HAVE BEEN ADDRESSED PRIOR TO DEP. I WAS NOT RECALLED TO ACFT X THAT EVENING; NOR AM I AWARE OF ANY FURTHER ITEMS RELATED TO THIS SYS PRIOR TO DEP. I DID NOT CALL MAINT CTL FOR A FOLLOW-UP AS I SAW THE ACFT TERMINATED IN ZZZ FOR A HVY MAINT CHK.