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NTSB Report
January 3, 1992 · Boeing 737-300 · N343UA
Denver, CO
Overview
Report Status
Probable Cause
Event Type
Incident
Date
January 3, 1992
Injury Outcomes
No injuries (127 uninjured)
Location
Denver, CO
Aircraft
Boeing 737-300
Tail Number
N343UA
Operator
United Airlines
Injuries
None
Aircraft Damage
Minor
NTSB Number
DEN92IA025
DURING CLIMB, THE CREW NOTED AN ELECTRICAL ARCING SOUND AND SLIGHT ELECTRICAL-TYPE BURNING ODOR WHILE PASSING THROUGH FLIGHT LEVEL 180. EMERGENCY PROCEDURES WERE COMPLIED WITH AND THE PROBLEM APPEARED TO BE SOLVED. THE CLIMB WAS CONTINUED, AND WHILE PASSING THROUGH FLIGHT LEVEL 330 A LOUD ARCING SOUND WAS AGAIN HEARD ACCOMPANIED BY FLAMES FROM THE FLIGHT DECK AFT OVERHEAD PANEL. THE FLIGHT ATTENDANTS EXTINGUISHED THE FIRE, AND THE FLIGHT RETURNED TO DENVER AND LANDED WITHOUT FURTHER INCIDENT. EXAMINATION DISCLOSED A SHORT IN A WIRE BUNDLE. THE BUNDLE WAS NOT SHIELDED OR ANCHORED AS THE OTHER MAJOR BUNDLE IN THE COMPARTMENT. THE SHORT WAS DUE TO THE BUNDLE CHAFING ON THE FLIGHT DECK ENTRY DOOR FRAME. IN ADDITION, TESTING REVEALED THAT THE WIRE GAUGE USED IN PART OF THIS APPLICATION WAS INSUFFICIENT FOR THE ELECTRICAL LOAD.
NTSB Probable Cause
AN ELECTRICAL SHORT CIRCUIT IN A MAIN WIRE BUNDLE DUE TO CHAFING OF THE BUNDLE ON AIRFRAME STRUCTURAL MEMBERS.
Full Narrative
DURING CLIMB, THE CREW NOTED AN ELECTRICAL ARCING SOUND AND SLIGHT ELECTRICAL-TYPE BURNING ODOR WHILE PASSING THROUGH FLIGHT LEVEL 180. EMERGENCY PROCEDURES WERE COMPLIED WITH AND THE PROBLEM APPEARED TO BE SOLVED. THE CLIMB WAS CONTINUED, AND WHILE PASSING THROUGH FLIGHT LEVEL 330 A LOUD ARCING SOUND WAS AGAIN HEARD ACCOMPANIED BY FLAMES FROM THE FLIGHT DECK AFT OVERHEAD PANEL. THE FLIGHT ATTENDANTS EXTINGUISHED THE FIRE, AND THE FLIGHT RETURNED TO DENVER AND LANDED WITHOUT FURTHER INCIDENT. EXAMINATION DISCLOSED A SHORT IN A WIRE BUNDLE. THE BUNDLE WAS NOT SHIELDED OR ANCHORED AS THE OTHER MAJOR BUNDLE IN THE COMPARTMENT. THE SHORT WAS DUE TO THE BUNDLE CHAFING ON THE FLIGHT DECK ENTRY DOOR FRAME. IN ADDITION, TESTING REVEALED THAT THE WIRE GAUGE USED IN PART OF THIS APPLICATION WAS INSUFFICIENT FOR THE ELECTRICAL LOAD.
Flight
Event TypeIncident
Event Time13:55 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireIflt
Aircraft ExplosionNo
Aircraft
AircraftBoeing 737-300
Tail NumberN343UA
Aircraft CategoryAir
DamageMinor
OperatorUnited Airlines
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsGe · CFM 56 · Turbofan · 20000
Seats136
People & Injuries
Injury SummaryNo injuries (127 uninjured)
Fatal0
Serious0
Minor0
Uninjured127
Total127
Crew 1Age 48 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind190° @ 7 kt
Visibility99 sm
CeilingNone
Temperature / Dew Point48 / 25 C
Altimeter29.00 inHg
Weather SourcePILO