# NTSB MIA92LA167: Boeing 737-200, N206AU, Miami, FL, August 27, 1992

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: August 26, 1992, 20:10 local (Aug 27, 1992, 00:10 UTC)
- Place: Miami, FL
- Coordinates: 25.820623, -80.299049 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=25.8206&lon=-80.2990&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 minor, 92 uninjured
- Status: Completed, report May 26, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 33123
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA92LA167
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33123/pdf
- Page: https://openairdocs.org/ntsb/MIA92LA167

## Probable cause

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

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, standing - engine(s) operating
  - electrical system - shorted (cause)
  - electrical system - smoke
- Miscellaneous/other, other
  - evacuation - performed

## Analysis

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.

## Aircraft

- Registration: [N206AU](https://openairdocs.org/deregistered/N206AU-1998-08-25), registration cancelled 1998-08-25, S/N 19422 (OpenAirDocs)
- Reported make and model: BOEING 737-200
- Registry model: [Boeing 737-201](https://openairdocs.org/model/boeing-737-201) (registry code 1384454) (OpenAirDocs)
- Category: Airplane
- Serial number: 19422
- Airframe hours: 58399
- Engines: P&W JT8D-9A 14000 lbs thrust turbo jet
- Damage: No damage
- Flight: Part 121
- Operator: Carnival Airlines
- Registered owner: First Security Bank Of Utah
- Airworthiness certificate: Standard, Transport
- Last inspection: Continuous airworthiness, August 10, 1992, 43 hours before
- Departed: MIA
- Destination: MYNN, NASSAU, OF
- Flight plan: IFR
- Airport: MIA, Miami International

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 53; flight engineer, commercial, airline transport; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 15,000 total, 1,400 in this make and model, 8,000 as pilot in command, 180 in the last 90 days, 60 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dusk
- Wind: 60° at 9 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 84 °F, dew point 72 °F
- Altimeter: 30.00 inHg
- Observed at: MIA, 1 nm away

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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