MIAMI, FL, USA
N206AU
BOEING 737-200
WHILE AWAITING TAKEOFF CLEARANCE, THE CAPT STATED THAT HE OBSERVED A FLASH OF LIGHT & SMELLED SMOKE. HE INITIATED THE PAX EVACUATION CHECKLIST & ALL PAX EVACUATED THE ACFT. EXAM OF THE ACFT BY COMPANY MAINT PERSONNEL REVEALED THAT THE NO. 1 GENERATOR CONTROL UNIT (GCU) LOCATED BEHIND THE FIRST OFFICER'S SEAT EXPERIENCED INTERNAL FAILURE. THE GCU WAS REMOVED FOR FURTHER EXAMINATION. EXAM OF THE UNIT REVEALED THAT A DIODE LOCATED INSIDE A TRANSFORMER WAS SHORTED, WHICH OVERHEATED THE TRANSFORMER & PRODUCED THE SMOKE. ACCORDING TO BOEING, THERE HAVE BEEN 12 SIMILAR OCCURRENCES.
FAILURE (SHORT) OF A DIODE LOCATED INSIDE A TRANSFORMER WHICH IS LOCATED IN THE NO. 1 GENERATOR CONTROL UNIT.
Source: NTSB Aviation Accident Database
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