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Accident
Last updated: 28 March 2017
Estado:Final
Fecha:lunes 19 mayo 1980
Hora:12:05 EDT
Tipo:Silhouette image of generic LJ25 model; specific model in this crash may look slightly different
Learjet 25D
Operador:Northeast Jet
Registración: N125NE
Numéro de série: 25-271
Año de Construcción: 1979
Horas Totales de la Célula:1200
Motores: 2 General Electric CJ610-8A
Tripulación:Fatalidades: 2 / Ocupantes: 2
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 2 / Ocupantes: 2
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:167 km (104.4 milles) W de la costa de Sarasota, FL, USA [Gulf of Mexico] (   Océano Atlántico)
Fase: En ruta (ENR)
Naturaleza:Ferry/Posicionado
Aeropuerto de Salida:West Palm Beach International Airport, FL (PBI/KPBI), Estados Unidos de América
Aeropuerto de Llegada:New Orleans International Airport, LA (MSY/KMSY), Estados Unidos de América
Descripción:
Lost control after encountering clear air turbulence at FL430. The Learjet had exceeded its Mach limits when the pilots responded to the encounter. The Mach overspeed warning horn had been disconnected with an unauthorized cut-off switch.

Probable Cause:

PROBABLE CAUSE: "An unexpected encounter with moderate to severe clear air turbulence, the flightcrew's improper response to the encounter, and the aircraft's marginal controllability characteristics when flown at and beyond the boundary of its high altitude speed envelope, all of which resulted in the aircraft exceeding its Mach limits and a progressive loss of control from which recovery was not possible. Contributing to the accident was the disconnection of the Mach overspeed warning horn with an unauthorized cut-out switch which resulted in the absence of an overspeed warning that probably delayed the crew's response to the turbulence encounter, and the insonsistencies in aircraft flight manuals and flightcrew training programs regarding the use of spoilers to regain control."

Fuentes:

Official accident investigation report
cover
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB-AAR-81-15
report released:15 September 1981
duration of investigation: 1 year and 4 months
download report: NTSB-AAR-81-15

Subsiguiente / acciones de seguridad

NTSB issued 1 Safety Recommendation

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from West Palm Beach International Airport, FL to New Orleans International Airport, LA as the crow flies is 1053 km (658 miles).

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