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NTSB Report
March 16, 1990 · Learjet 24 · N100VQ
Anderson, SC
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 16, 1990
Injury Outcomes
4 injuries (2 serious injuries, 2 minor injuries)
Location
Anderson, SC
Aircraft
Learjet 24
Tail Number
N100VQ
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
ATL90LA080
WHILE CRUISING AT 42,000 FEET, THE PILOT ATTEMPTED TO ADUST HIS MAP LIGHT WHEN THE CIRCUIT BREAKER POPPED. WHEN THE COPILOT RESET THE BREAKER A FIRE IGNITED AT THE OXYGEN PANEL. THE BLOWTORCH EFFECT CAUSED EXTENSIVE DAMAGE TO THE LEFT INTERIOR AT THE PILOT'S STATION. TWO PASSENGERS WERE HOSPITALIZED FOR SMOKE INHALATION. EXAMINATION OF THE DAMAGED AREA DISCLOSED THAT A WIRE FROM THE LIGHT ASSEMBLY ARCED AND CONTACTED AN OXYGEN SUPPLY LINE. FURTHER EXAMINATION ALSO DISCLOSED LOOSE OXYGEN LINES ADJACENT TO THE ARCING. SUBSEQUENT TO THE MISHAP, LEARJET DEVELOPED A PROTECTION KIT TO PREVENT CONTACT BETWEEN THE OXYGEN LINES AND ELECTRICAL COMPONENTS.
NTSB Probable Cause
ELECTRICAL ARCING WHICH RESULTED FROM A SHORT IN THE PILOT'S MAP LIGHT CIRCUIT; A CHAFTED WIRE CONTACTED THE OXYGEN SUPPLY LINE AT THE OXYGEN CONTROL PANEL IN THE COCKPIT. A FACTOR IN THE ACCIDENT WAS THE INADEQUATE DESIGN OF THE OXYGEN PANEL PLUMBING AND ELECTRICAL WIRING FOR THE PILOT'S MAP LIGHT WHICH ALLOWED CONTACT BETWEEN THE TWO SYSTEMS.
Full Narrative
WHILE CRUISING AT 42,000 FEET, THE PILOT ATTEMPTED TO ADUST HIS MAP LIGHT WHEN THE CIRCUIT BREAKER POPPED. WHEN THE COPILOT RESET THE BREAKER A FIRE IGNITED AT THE OXYGEN PANEL. THE BLOWTORCH EFFECT CAUSED EXTENSIVE DAMAGE TO THE LEFT INTERIOR AT THE PILOT'S STATION. TWO PASSENGERS WERE HOSPITALIZED FOR SMOKE INHALATION. EXAMINATION OF THE DAMAGED AREA DISCLOSED THAT A WIRE FROM THE LIGHT ASSEMBLY ARCED AND CONTACTED AN OXYGEN SUPPLY LINE. FURTHER EXAMINATION ALSO DISCLOSED LOOSE OXYGEN LINES ADJACENT TO THE ARCING. SUBSEQUENT TO THE MISHAP, LEARJET DEVELOPED A PROTECTION KIT TO PREVENT CONTACT BETWEEN THE OXYGEN LINES AND ELECTRICAL COMPONENTS.
Flight
Event TypeAccident
Event Time21:45 EST
Nearest AirportAnderson County (0nm N)
Runway23
Runway Length5000 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireIflt
Aircraft ExplosionIflt
Aircraft
AircraftLearjet 24
Tail NumberN100VQ
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 135
Engines2
Engine TypeTurbofan
Engine DetailsGe · CJ610-4 · Turbofan · 2850
Seats8
People & Injuries
Injury Summary4 injuries (2 serious injuries, 2 minor injuries)
Fatal0
Serious2
Minor2
Uninjured0
Total4
Crew 1Age 42 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind100° @ 8 kt
Visibility7 sm
CeilingBroken clouds 5000 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time01:50
Weather SourceWFAC