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Last updated: 22 January 2021
Status:Definitief
Datum:donderdag 18 januari 1990
Tijd:17:10
Type:Silhouette image of generic LJ23 model; specific model in this crash may look slightly different
Learjet 23
Luchtvaartmaatschappij:Aero Flight Services
Registratie: N331DP
Constructienummer: 23-067
Bouwjaar: 1965
Aantal vlieguren:5600
Motoren: 2 General Electric CJ610-4
Bemanning:slachtoffers: 2 / inzittenden: 2
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 2 / inzittenden: 2
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:Ansonia, OH (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Ferry
Vliegveld van vertrek:Detroit-Willow Run Airport, MI (YIP/KYIP), Verenigde Staten
Vliegveld van aankomst:Louisville-Standiford Field, KY (SDF/KSDF), Verenigde Staten
Beschrijving:
The Learjet 23, N331DP, was cleared for takeoff on a flight from Detroit-Willow Run Airport, MI (YIP) to Louisville-Standiford Field, KY (SDF). At 05:32, about 17 minutes into the flight, the flight crew began to display indications of a deterioration of their ability to control the aircraft. At first, they deviated from instructions to hold west of the Findlay VOR at FL220. As the flight continued and was cleared to FL270, the crew displayed confusion about magnetic headings and basic instruments. At 05:48, the aircraft deviated from the en route heading and the wrong heading was read back after a heading correction was given. Also, the aircraft continued climbing (to FL291), then radar and radio contact were lost at 05:51. The controller noted the pilot's speech was slurred and some portions of the conversation were unintelligible. Subsequently, the aircraft crashed in a steep dive. No preimpact part failure was verified, though impact forces and post-crash fire resulted in extensive damage of the aircraft. The aircraft was equipped with oxygen and pressurization systems. No audible warning was noted on ATC recordings to indicate the cabin altitude had exceeded 10,000 feet, though the aircraft was equipped with such a device.

Probable Cause:

PROBABLE CAUSE: "The flight crew became incapacitated for undetermined reasons and lost control of the airplane. "

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years and 2 months
Accident number: ATL90MA051
Download report: Summary report

Bronnen:
» NTSB


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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 Detroit-Willow Run Airport, MI en Louisville-Standiford Field, KY bedraagt 486 km (304 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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