Accident
Last updated: 30 August 2014
Statuts:Enquête Officielle
Date:mercredi 10 juillet 1991
Heure:18:12
Type/Sous-type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft C99
Compagnie:L'Express Airlines
Immatriculation: N7217L
Numéro de série: U-226
Année de Fabrication: 1984
Moteurs: 2 Pratt & Whitney Canada PT6A-36
Equipage:victimes: 1 / à bord: 2
Passagers:victimes: 12 / à bord: 13
Total:victimes: 13 / à bord: 15
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:11 km (6.9 milles) SW of Birmingham Airport, AL (BHM) (   Etats-Unis d'Amérique) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Mobile Municipal Airport, AL (MOB/KMOB), Etats-Unis d'Amérique
Aéroport de destination:Birmingham Airport, AL (BHM/KBHM), Etats-Unis d'Amérique
Numéro de vol: 508
Détails:
The Beechcraft took off from Mobile at 17:05 for the last leg of the New Orleans-Mobile-Birmingham flight. Weather was bad around the Birmingham airport as flight 508 approached. Three aircraft had diverted to another airport, a Piper Aerostar had landed prior to the accident, a Gates LearJet after the accident. The weather reported to the crew at 18:05 was 1100 feet overcast, 2,5 miles visibility, thunderstorm and rainshower wind 340/12kts.
An upset occurred as the flight entered an area of thunderstorm activity. The aircraft rolled left and pitched up as the aircraft approached level flight with approx. 30deg of left bank. The aircraft then entered a stall (or a prestall buffet) and started to descend. The descent couldn't be arrested and the aircraft crashed into a residential area, destroying two homes and two automobiles.


PROBABLE CAUSE: "The decision of the captain to initiate and continue an instrument approach into clearly identified thunderstorm activity, thunderstorm activity, resulting in a loss of control of the airplane from which the flight crew was unable to recover and subsequent collision with obstacles and the terrain."

Sources:
» CNN
» NTSB Safety Recommendations A-92-18 through -20
» NTSB/AAR-92/01
» Scramble Vol.13, nr.05

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-92-01
report released:03-MAR-1992
duration of investigation:237 days (7.9 months)
download report: L'Express Airlines, Inc., Flight 508 Beech C99, N7217L Weather Encounter and Crash near Birmingham, Alabama, July 10, 1991. (NTSB/AAR-92-01)
cover

Opérations de secours

NTSB issued 3 Safety Recommendations

Show all AD's and Safety Recommendations

Photos

photo of Beechcraft C99 N7217L
N7217L was bought by L'Express in June 1991
Add your photo of this accident or aircraft
 

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 Mobile Municipal Airport, AL et Birmingham Airport, AL est de 346 km (217 miles).

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