Status: | Accident investigation report completed and information captured |
Datum: | maandag 19 mei 1980 |
Tijd: | 12:05 EDT |
Type: | 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)
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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:
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Investigating agency: | NTSB |
Status: | Investigation completed |
Duration: | 1 year and 4 months | Accident number: | NTSB-AAR-81-15 | Download report: | Final report
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Veiligheidsmaatregelen
NTSB issued 1 Safety Recommendation
Issued: 24-SEP-1981 | To: NOAA | A-81-103 |
DEFINE THE RELATIONSHIP BETWEEN CLEAR AIR TURBULENCE AND UPPER FRONTS AS ANALYZED BY SOUNDINGS AND DEVELOP FORECASTING TECHNIQUES TO UTILIZE THE INFORMATION TO IMPROVE CLEAR AIR TURBULENCE FORECASTS. (Closed - Unacceptable Action) |
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Foto's
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.