Accident
Last updated: 26 October 2014
Statuts:Enquête Officielle
Date:lundi 23 juillet 1973
Heure:17:43
Type/Sous-type:Silhouette image of generic F27 model; specific model in this crash may look slightly different
Fairchild FH-227B
Compagnie:Ozark Air Lines
Immatriculation: N4215
Numéro de série: 513
Année de Fabrication: 1966
Heures de vol:14300
Moteurs: 2 Rolls-Royce Dart 532-7
Equipage:victimes: 1 / à bord: 3
Passagers:victimes: 37 / à bord: 41
Total:victimes: 38 / à bord: 44
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:3,7 km (2.3 milles) SE of Saint Louis-Lambert International Airport, MO (STL) (   Etats-Unis d'Amérique) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Marion-Williamson County Airport, IL (MWA), Etats-Unis d'Amérique
Aéroport de destination:Saint Louis-Lambert International Airport, MO (STL/KSTL), Etats-Unis d'Amérique
Numéro de vol: 809
Détails:
Ozark Air Lines Flight 809, an FH-227B, was a regular flight between Nashville Metropolitan Airport, TN (BNA) and St. Louis (STL), with intermediate stops at Clarksville, TN (CKV), Paducah, KY (PAH), Cape Girardeau Airport, MO (CGI) and Marion-Williamson County Airport, IL (MWA) with an instrument flight rules (IFR) flight plan.
The flight departed Marion at 17:05. The flight proceeded via the V-335 airway toward St. Louis without difficulty. At 17:26, the Kansas City Air Route Traffic Control Center (KCC) controller requested that Flight 809 make a 360 degree turn to the right. He advised that there would be about a 5-minute delay and that the right turn would keep the flight clear of the weather.
At 17:28, the KCC controller cleared the flight to proceed to the St. Louis VOR and to contact St. Louis Approach Control. One minute later the first officer transmitted, "Approach, this is Ozark eight oh nine, seven thousand, with Quebec." Weather information 'Quebec' indicated: Estimated ceiling-4,000 feet broken, visibility-5 miles, haze
and smoke, wind-120° at 8 knots , temperature-92 degrees, altimeter-30.06, ILS runway 12R approaches in use, landing and departing runways 12. The approach controller responded: "Ozark eight oh nine, Roger, maintain seven thousand and, ... continue toward the VOR, be vectors runway three zero left ILS." Between 17:32 and 17:39, the approach controller gave Flight 809 radar vectors through an area of thunderstorm cells that lay south and southeast of the St. Louis Airport. At 17:40, the controller cleared the flight for an ILS approach to runway 30L and cleared the flightcrew to contact the St. Louis Control Tower. The Tower controller cleared the flight to land.
At 17:42:31, the local controller said, "Ozark eight oh nine, it looks like a heavy rain shower moving right across the approach end of the runway now." The first officer replied, "Roger, we see it."
After passing the Outer Marker, the aircraft began to descend below the glide slope until it struck the ground.
First, the aircraft struck tree tops about 55 feet above the ground. It continued and struck the ground on a hillside near Lowen Drive in Normandy, Missouri--a suburb of St. Louis.


PROBABLE CAUSE: "The aircraft's encounter with a downdraft following the captain's decision to initiate and continue an instrument approach into a thunderstorm. The captain's decision probably was influenced by the lack of a timely issuance of a severe weather warning by the National Weather Service, and the improper assessment of the weather conditions in the terminal area by the flight crew and the flight dispatcher."

Sources:

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-74-05
report released:24-APR-1974
duration of investigation:275 days (9.2 months)
download report: Ozark Air Lines, Inc., Fairchild Hiller FH-227B, N4215, near the Lambert- St. Louis International Airport, St. Louis, Missouri, July 23, 1973. (NTSB/AAR-74-05)
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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Marion-Williamson County Airport, IL et Saint Louis-Lambert International Airport, MO est de 160 km (100 miles).

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