What was found
SEVERAL MINUTES AFTER DEPARTING SENDING FACILITY, WITH PATIENT ONBOARD, THE NURSE ASKED ABOUT A "FIREWORKS" LIKE SMELL. UNTIL THEN, I THOUGHT THE SMELL WAS THE PATIENT. I TURNED OFF THE A/C AND FAN, OPENED THE FRESH AIR VENT. THE SMELL SUBSIDED, BUT NOT BY MUCH. AFTER A MINUTE OR SO, THE SMELL WAS TROUBLING ENOUGH THAT WE ELECTED TO DIVERT TO A NEARBY AIRPORT. SHORTLY THEREAFTER THE GEN DISCON FOR ENGINE ONE CAME ON. WE LANDED AT THE AIRPORT, CREW MADE PATIENT TRANSPORT ARRANGEMENTS AND I CONTACTED MAINTENANCE. MAINTENANCE: BEGAN TROUBLESHOOTING BY REMOVING INTERIOR AND ENGINE PANELS AND COWLINGS. NOTICEABLE SMELL WAS EMITTING FROM #1 ELECTRICAL MASTER BOX, I CONDUCTED A SYSTEM TEST ON THE DC POWER SYSTEM/GENERATION PER AMM 24-30-00,5-1 AND FOUND BOTH THE #1 ELECTRICAL MASTER BOX AND BATTERY MASTER BOX PRESENTING FAILURE ERROR CODES WHICH REQUIRE REPLACEMENT OF BOTH. #1 ELECTRICAL MASTER BOX (EMB); THALES; P/N 4503-350-4; S/N 1092. BATTERY MASTER BOX; THALES; P/N 4504-300-6; S/N 1496, SUSPECT POSSIBLE STARTER GENERATOR FAILURE AS WELL BUT UNABLE TO TEST UNTIL NEW ELECTRICAL MASTER BOX INSTALLED. REPLACED #1 EMB AND STARTER/GENERATOR. BATTERY MASTER BOX PASSED SELF TEST AFTER #1 EMB REPLACEMENT.