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Last updated: 22 January 2021
Statuts:Enquête Officielle
Date:jeudi 18 janvier 1990
Heure:17:10
Type/Sous-type:Silhouette image of generic LJ23 model; specific model in this crash may look slightly different
Learjet 23
Compagnie:Aero Flight Services
Immatriculation: N331DP
Numéro de série: 23-067
Année de Fabrication: 1965
Heures de vol:5600
Moteurs: 2 General Electric CJ610-4
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:Ansonia, OH (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Convoyage
Aéroport de départ:Detroit-Willow Run Airport, MI (YIP/KYIP), Etats-Unis d'Amérique
Aéroport de destination:Louisville-Standiford Field, KY (SDF/KSDF), Etats-Unis d'Amérique
Détails:
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

Sources:
» NTSB


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

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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