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Last updated: 2 December 2021
Statuts:Enquête Officielle
Date:vendredi 1 février 1991
Heure:18:07
Type/Sous-type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AC Metro III
Compagnie:SkyWest Airlines
Immatriculation: N683AV
Numéro de série: AC-683
Année de Fabrication: 1987
Moteurs: 2 Garrett TPE331
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 10 / à bord: 10
Total:victimes: 12 / à bord: 12
Victime de la collision:victimes: 22
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Los Angeles International Airport, CA (LAX) (   Etats-Unis d'Amérique)
Élévation des lieux de l'accident: 38 m (125 feet) amsl
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Nat.
Aéroport de départ:Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique
Aéroport de destination:Palmdale Airport, CA (PMD/KPMD), Etats-Unis d'Amérique
Numéro de vol:5569
Détails:
USAir Flight 1493 left Columbus at 13:17 for a flight to Los Angeles. The Boeing 737-300, N388US, aircraft entered LAX airspace around 17:57 and was cleared for a CIVET Two Profile Descent and ILS runway 24R approach. At 17:59 this was changed to a runway 24L approach clearance.
At about the same time a SkyWest Metro III aircraft (Flight 5569 to Palmdale) taxied out from Terminal 6, Gate 32 to runway 24L. At 18:03 the crew were advised to "taxi up to and hold short of 24L" because of other traffic. At 18:04:49 the flight was cleared to taxi into position and hold. Immediately thereafter the controller became preoccupied with instructing WingsWest Flight 5006 who had unintentionally departed the tower frequency. The WingsWest 5072 reporting ready for takeoff caused some confusion because the controller didn't have a flight progress strip in front of her. The strip appeared to have been misfiled at the clearance delivery position. Meanwhile, Flight 5569 was still on the runway at the intersection with taxiway 45, awaiting takeoff clearance.
At 18:07 Flight 1493 touched down. Simultaneous to the nosegear touchdown, the Boeing 737 collided with the SkyWest Metro. Both aircraft caught fire and slid to the left into an unoccupied fire station.

Probable Cause:

PROBABLE CAUSE: "The failure of the Los Angeles Air Traffic Facility Management to implement procedures that provided redundancy comparable to the requirements contained in the National Operational Position Standards and the failure of the FAA ATS to provide adequate policy direction and oversight to its ATC facility managers. These failures created an environment in the Los Angeles ATC tower that ultimately led to the failure of the Local Controller 2 (LC2) to maintain awareness of the traffic situation, culminating in the inappropriate clearances and the subsequent collision of the USAir and SkyWest aircraft. Contributing to the cause pf the accident was the failure of the FAA to provide effective quality assurance pf the ATC system."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 263 days (9 months)
Accident number: NTSB/AAR-91-08
Download report: Final report

Sources:
» Aviation Week & Space Technology 11.02.91 (27)
» ICAO Adrep Summary 4/94 (#72)


Photos

photo of Metro-III-
Wreckage diagram
photo of Metro-III-
Airport map
 

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 Los Angeles International Airport, CA et Palmdale Airport, CA est de 81 km (51 miles).
Accident location: Exact; deduced from official accident report.

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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