Crash-aerien 19 MAY 2020 d'un Boeing 737-8Q8 (WL) N820TJ - Victorville-Southern California Logistics Airport, CA (VCV)
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Statuts:Accident investigation report completed and information captured
Date:mardi 19 mai 2020
Type/Sous-type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8Q8 (WL)
Compagnie:Swift Air
Immatriculation: N820TJ
Numéro de série: 28218/160
Année de Fabrication: 1998-11-24 (21 years 6 months)
Moteurs: 2 CFMI CFM56-7B26
Equipage:victimes: 0 / à bord: 7
Passagers:victimes: 0 / à bord: 88
Total:victimes: 0 / à bord: 95
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:W of Victorville-Southern California Logistics Airport, CA (VCV) (   Etats-Unis d'Amérique)
Phase de vol: En montée initiale (ICL)
Nature:Transport de Passagers Nat.
Aéroport de départ:Victorville-Southern California Logistics Airport, CA (VCV/KVCV), Etats-Unis d'Amérique
Aéroport de destination:San Diego International Airport, CA (SAN/KSAN), Etats-Unis d'Amérique
Numéro de vol:3518
Swift Air flight 3518, a Boeing 737-800, N820TJ, was climbing through about 8,000 feet when the flight crew heard a loud bang but the systems and engine indications remained normal. The flight crew elected to continue to San Diego International Airport (SAN), California. Post-flight examination of the airplane found that the vertical stabilizer dorsal fin and several other panels were missing. The left horizontal stabilizer was substantially damaged from impact with the missing components.

On February 26, 2019 (less than 3 months before the accident), the fuselage skin under the dorsal fin was inspected at iAero Repair Station, Miami, Florida. This inspection was done every 24,000 flight cycles to identify and remove corrosion. The maintenance instructions for the dorsal fin indicated that the mechanic should note the type and location of the bolts removed to ensure that each bolt would be returned to the same location from where it was removed. (The dorsal fin had different bolts with varying grip lengths.) Once the bolts were reinstalled, sealant was applied to the bolt heads.

Most of the dorsal fin, the vertical stabilizer panels, and 7 of the 14 bolts attaching the dorsal fin to the fuselage were not recovered. Of the seven bolts that were recovered, four remined installed, and three were found loose. Three of the four installed bolts remained attached to pieces of the dorsal fin structure. Examination of the photographs showed that the bolts installed in three positions on the left side of the dorsal fin were the correct part number. The bolt installed in a position on the right side of the dorsal fin was not the correct part number, and the bolt was longer than required. The photographs also showed remnants of old sealant at each of the bolt locations but no evidence that sealant was applied during maintenance of the dorsal fin in February 2019 (less than 3 months before the accident).
The seven missing bolts for the dorsal fin structure became loose, had fractured, or were not properly installed.

Probable Cause:

Probable Cause: Improper installation of dorsal fin attach bolts which caused the dorsal fin to separate during flight, substantially damaging the left horizontal stabilizer.

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 2 months
Accident number: DCA20LA107
Download report: Summary report



photo of Boeing-737-8Q8-N820TJ
accident date: 19-05-2020
type: Boeing 737-8Q8 (WL)
registration: N820TJ

Video, social media

This map shows the airport of departure and the intended destination of the flight. The line is connecting ADS-B datapoints from Flightradar24.
La distance entre Victorville-Southern California Logistics Airport, CA et San Diego International Airport, CA est de 207 km (129 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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