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Last updated: 22 October 2020
Status:Definitief
Datum:maandag 19 mei 1980
Tijd:12:05 EDT
Type:Silhouette image of generic LJ25 model; specific model in this crash may look slightly different
Learjet 25D
Luchtvaartmaatschappij:Northeast Jet
Registratie: N125NE
Constructienummer: 25-271
Bouwjaar: 1979
Aantal vlieguren:1200
Motoren: 2 General Electric CJ610-8A
Bemanning:slachtoffers: 2 / inzittenden: 2
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 2 / inzittenden: 2
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:167 km (104.4 mijl) W van Sarasota, FL, USA [Gulf of Mexico] (   Atlantische Oceaan)
Fase: Kruisvlucht (ENR)
Soort vlucht:Ferry
Vliegveld van vertrek:West Palm Beach International Airport, FL (PBI/KPBI), Verenigde Staten
Vliegveld van aankomst:New Orleans International Airport, LA (MSY/KMSY), Verenigde Staten
Beschrijving:
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


Veiligheidsmaatregelen

NTSB issued 1 Safety Recommendation

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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen West Palm Beach International Airport, FL en New Orleans International Airport, LA bedraagt 1053 km (658 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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