Accident Boeing 737-201 N206AU, Wednesday 26 August 1992

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Date:	Wednesday 26 August 1992
Time:	21:10 LT
Type:	Boeing 737-201
Owner/operator:	Carnival Airlines
Registration:	N206AU
MSN:	19422/61
Year of manufacture:	1968
Total airframe hrs:	58399 hours
Engine model:	P&W JT8D-9A
Fatalities:	Fatalities: 0 / Occupants: 95
Other fatalities:	0
Aircraft damage:	None
Category:	Accident
Location:	Miami, FL - United States of America
Phase:	Standing
Nature:	Unknown
Departure airport:	(KMIA)
Destination airport:	Nassau, OF (MYNN)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
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.

Probable Cause: FAILURE (SHORT) OF A DIODE LOCATED INSIDE A TRANSFORMER WHICH IS LOCATED IN THE NO. 1 GENERATOR CONTROL UNIT.

Accident investigation: