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Last updated: 27 September 2021
Statuts:Enquête Officielle
Date:mercredi 21 mai 1997
Heure:13:14
Type/Sous-type:Silhouette image of generic E120 model; specific model in this crash may look slightly different
Embraer EMB-120RT Brasilia
Compagnie:SkyWest Airlines
Immatriculation: N198SW
Numéro de série: 120277
Année de Fabrication: 1991
Heures de vol:15646
Moteurs: 2 Pratt & Whitney Canada PW118
Equipage:victimes: 0 / à bord: 3
Passagers:victimes: 0 / à bord: 14
Total:victimes: 0 / à bord: 17
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:San Diego International Airport, CA (SAN) (   Etats-Unis d'Amérique)
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Nat.
Aéroport de départ:San Diego International Airport, CA (SAN/KSAN), Etats-Unis d'Amérique
Aéroport de destination:Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique
Numéro de vol:724
Détails:
Skywest Flight 724, an Embraer EMB-120, N198SW, experienced a total loss of engine power to the right engine and associated engine fire, followed by a total loss of all airplane hydraulic systems, after takeoff from San Diego International-Lindbergh Field, California. The airplane sustained substantial damage. The 2 pilots, 1 flight attendant, and 14 passengers were not injured.
According to the pilots, about 2,000 feet mean sea level (msl) during the initial climb, a bang sound was heard; the airplane yawed right, and the right propeller auto feathered. Flames were observed by passengers and the cabin attendant emanating from the right engine. The crew performed the engine shutdown and fire check lists, and turned off the fuel within 1 minute of the mishap.
The cockpit crew extinguished the fire using both of the airplane's fire bottles. The cockpit crew then observed that hydraulic and rudder lights on the master alert panel were illuminated, along with the associated hydraulic lights on the overhead panel, which indicated loss of both hydraulic systems.
The crew diverted to Naval Air Station (NAS) Miramar, extended the landing gear manually, and accomplished a landing without flaps. The captain indicated that he landed within the first 2,000 feet of runway 24R. He was unable to use single engine reverse thrust to decelerate because of the loss of nose wheel steering. Additionally, the captain attempted to use the airplane's primary and emergency brakes; however, hydraulic pressure was also lost to these systems. The airplane overran the departure end of the runway and came to rest in the adjacent field.

Probable Cause:

PROBABLE CAUSE: "The failure of maintenance personnel to allow adequate time for the engine oil to drain back into the engine oil reservoir prior to adding additional oil, thereby overfilling the reservoir, which resulted in an engine fire and subsequent damage to hydraulic lines and components, including the brakes, which precluded stopping the airplane prior to overrunning the runway end. An additional factor was the confusing and insufficiently defined procedures for servicing the engine oil."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 4 years and 2 months
Accident number: LAX97FA189
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 San Diego International Airport, CA et Los Angeles International Airport, CA est de 175 km (109 miles).

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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