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Last updated: 20 October 2020
Statuts:Enquête Officielle
Date:lundi 19 mai 1980
Heure:12:05 EDT
Type/Sous-type:Silhouette image of generic LJ25 model; specific model in this crash may look slightly different
Learjet 25D
Compagnie:Northeast Jet
Immatriculation: N125NE
Numéro de série: 25-271
Année de Fabrication: 1979
Heures de vol:1200
Moteurs: 2 General Electric CJ610-8A
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 2 / à bord: 2
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:167 km (104.4 milles) W de Sarasota, FL, USA [Gulf of Mexico] (   Océan Atlantique)
Phase de vol: En vol (ENR)
Nature:Convoyage
Aéroport de départ:West Palm Beach International Airport, FL (PBI/KPBI), Etats-Unis d'Amérique
Aéroport de destination:New Orleans International Airport, LA (MSY/KMSY), Etats-Unis d'Amérique
Détails:
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."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: NTSB-AAR-81-15
Download report: Final report


Opérations de secours

NTSB issued 1 Safety Recommendation

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre West Palm Beach International Airport, FL et New Orleans International Airport, LA est de 1053 km (658 miles).
Accident location: Exact; as reported in the official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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