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Last updated: 19 November 2019
Statuts:Enquête Préliminaire
Date:samedi 4 août 2018
Heure:16:56
Type/Sous-type:Silhouette image of generic JU52 model; specific model in this crash may look slightly different
Junkers Ju-52/3mg4e
Compagnie:Ju-Air
Immatriculation: HB-HOT
Numéro de série: 6595
Année de Fabrication: 1939
Heures de vol:10189
Cycles:8783
Moteurs: 3 BMW 132A3
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 17 / à bord: 17
Total:victimes: 20 / à bord: 20
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:1,2 km (0.8 milles) SW of Piz Segnas (   Suisse)
Élévation des lieux de l'accident: 2540 m (8333 feet) amsl
Phase de vol: En vol (ENR)
Nature:Charter National
Aéroport de départ:Locarno Air Base (LSMO), Suisse
Aéroport de destination:Dübendorf Air Base (LSMD), Suisse
Détails:
A Junkers Ju-52/3m aircraft, operated by Ju-Air, was destroyed in an accident in a mountainous area in Switzerland. The aircraft crashed into the western slope of Piz Segnas at an elevation of 2540 m. All 17 passengers and three crew members were killed.
The aircraft had departed Locarno, Switzerland, at 16:10 on a flight to it's home base at Dübendorf.
The aircraft flew on a northeasterly course into the basin southwest of Piz Segnas. Towards the north end of the basin, it began a left turn, which developed into a descending spiral trajectory. A short time later, the aircraft collided with the ground almost vertically and at high speed.
Following the crash, all Swiss Junkers Ju-52 aircraft were grounded. Ju-Air was allowed to restart operations on August 17 with the two remaining aircraft of the same type. Since there were no indications of general technical defects at this time, the FOCA had approved the resumption of flight operations in compliance with precautionary measures.
On November 20, the Swiss TSB published an interim report. There was still no evidence that a serious technical problem led to the accident. The investigation of the wreck, however, revealed severe structural damage in the form of cracks and corrosion on the main spar, the supporting element of the aircraft wing, and other parts of the aircraft. This damage was hidden during normal inspections and maintenance and could only be determined from the debris.
Since the two Ju-52 HB-HOP and HB-HOS stationed in Dübendorf correspond in age as well as in hours of operation to the crashed aircraft, the Swiss authorities grounded both aircraft pending inspections.

Sources:
» 20min.ch
» STSB Preliminary information


Opérations de secours
Operations had been voluntarily suspended after August 4, 2018. The Swiss Federal Office of Civil Aviation (FOCA) allowed operations to be conducted per August 17 since the investigation by the STSB had not yet brought to light any technical problems with the accident aircraft. However, JU-Air first had to comply with the precautionary measures of the FOCA to commence flight operations. First, the FOCA required that, for the time being, a minimum altitude above the legal minimum altitude be maintained. Secondly, JU-Air’s aircraft had to carry a GPS data recorder that records every flight and allows subsequent assessment of the route. Third, the passengers should also remain strapped during the flight and not be able to circulate freely in the aircraft. This also applies to visits to the cockpit during the flight.

Photos

photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
photo of Junkers-Ju-52-3mg4e-HB-HOT
accident date: 04-08-2018
type: Junkers Ju-52/3mg4e
registration: HB-HOT
 

Video, social media

Aircraft history
date registration operator remarks
1 Oct. 1939 A-702 Swiss Air Force
29 July 1985 HB-HOT Ju-Air registered

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 Locarno Air Base et Dübendorf Air Base est de 137 km (86 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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