And how exactly, given the info available, have you reached this conclusion ?

New restrictions to JU-Air flights
 

Sorry to start a new thread but the previous has been locked down for some reason (mods: fell free to append to existing).

The OFAC has released a few restriction for JU-Air effective immediately (sorry only found the French version). They require

• flight level above legal minima (sorry no specifics given)
• GPS based flight recording to retrace past routes
• measures (again no specifics) insuring that passengers can't move in the cabin during flight

Although nothing explicit one can read between the lines...

There are some eerily similar circumstances between this crash and the Convair in SA. Highly experienced pilots allowing risky behaviour they otherwise would never allow in their professional worlds.

Initial Ju 52 report out
 

https://www.sust.admin.ch/inhalte/AV...hte/HB-HOT.pdf

Thread was locked so couldn't add it.

https://news.aviation-safety.net/201...ountain-basin/

BAZL ordered doubled minimum altitudes, GPS position logging for all flights and passengers seated and belted during all flights all the time. It's good that they can continue flying.

Here is a translation of the linked Swiss report dated 15Aug:

An investigation.
Place, date and time: 500 m southeast of Segnaspass (GR), August 4, 2018, 16:56 LT
Aircraft
Enrolment: HB-Hot
Samples: Junkers aircraft and engine Works AG, Ju-52/3m G4E
Holder: Association of Friends of the Swiss Air Force (VFL),
Via Landstrasse 271, 8600 Dübendorf
Owner: Swiss Air Force, P.O. Box 1072, 8600 Dübendorf
Pilots: 2
Cabin Crew: 1
Passengers: 17
Flight:
Flight rules: Visual flight Rules-VFR
Mode of operation: lucrative
Begin of departure: Locarno (LSZL)
Destination: Dübendorf (LSMD)
Damage:
Crew: 3 fatally injured
Passengers: 17 fatally injured
Third parties: None
Aircraft: Destroyed
Third-party damage: low Floor damage
Short Description: The plane flew on a northeast course in the basin Southwest
of the Piz Segnas. Against the northern end of the basin
It started a left turn that turned into a spiral trajectory
Developed against the bottom. A short time later, the plane collided almost
perpendicular to the terrain.

The report seems to make a few things more established. I note that there is no reference to "high speed". Unsurprisingly, there is no real analysis here.

OAP

Update: Report on 4 Aug 2018 JU52 Accident
 

A report has been issued by the Swiss authorities about the accident, including details about corrosion in parts of the airframe. I believe that operation of the type has been stopped at the present time. Obviously, a better translation of the document will help further understanding.

OAP

This document is an interim accident report but, I am afraid I cannot post a translation. I will attempt to post the internet address.
https://www.sust.admin.ch/inhalte/AV...B-HOT_ZB_D.pdf

OAP

Sad story . This interim report basically does not talk about the accident itself but about the corrosion found on the aircraft ,and despite the conclusion that the corrosion had nothing to do with the accident grounded the 2 other aircraft ;

My understanding with help from google.
Significant shortcomings in maintenance, management and parts inventory. Exfoliation corrosion in floor/wing attach area. Had cylinders salvaged from 1941 wreck? Engine two/three new cam discs found with damage, same in sister ships. Fuel/oil lines 30 years old!
Poor condition how ever, not related to the accident.

Thanks ATC and cappt, an "interim report".

OAP

Quite correct, cappt!
The intermediate report contains some more interesting details. Temperature was ISA + 16 and all engines were delivering power. The report from the accident investigation branch is not only rather damning for operator and maintenance, but also for the oversight of the Swiss Federal Office of Civil Aviation. They (FOCA) claim they could not have seen all the rotten stuff. Well, looking for instance at the picture of the fuel lines, its difficult to imagine that even a brief inspection could overlook that. Inspections nowadays are all about forms, stamps and signatures, the hardware only gets a brief glimpse. Not helpful is also the fact that operator, maintenance and engine repairs are all controlled by the same persons. And the boss now claims that the corrosion set in only after the accident.....

Is there no English translation available for this Report?

No, there is no official English version.

Not so far. You can copy and post the text into bing translate, page by page. The result is pidgin but, understandable. I have read that: " It crashed, 20 killed, ISA+16, no fire, unsurvivable. Subsequently, they have found corrosion, poor repairs, unregulated parts, unsegregated stock, all engines working at impact, fuel on board. The Flying permits for the other two aircraft are withdrawn. The full report will address all aspects of the accident".
It is sad reading. However, there is no attempt to describe the cause of the accident that I can find in this interim report.

OAP

In an earlier interview, the CEO of Ju-Air (before the accident) said that the three engines were rated at 500 hp each, not a lot for a 10.5 t hardware. Looking at the picture of the three cylinders in the interim report, this figure may even be rather optimistic.
The accident investigation (SUST) mentioned that cameras of victims were found, but up to date could not be evaluated due to the damage sustained. So they ask now passengers on earlier similar flights if they would please submit recordings.
There is indeed no statement to the cause of this tragedy. I think they will be very careful to word it even in the final report as it might be fodder for the lawyers. There is strong sympathy for the enthusiasm of the hole outfit (understandbly) and the pilots are mostly of military background who will stick togethter like glue (also understandbly)

It was mentioned at page 15:
An der Unfallstelle konnte eine grössere Anzahl von Mobiltelefonen und einzelne Filmkameras von Passagieren und Besatzungsmitgliedern sichergestellt werden. Diese Aufzeichnungsgeräte wurden beim Unfall teilweise stark beschädigt. Bis zur Veröffentlichung des Zwischenberichts konnten einzelne Datenträger ausgelesen werden. Die Reparatur- und Auslesearbeiten an der Mehrzahl der sichergestellten Geräte dauern aber weiter an und werden noch geraume Zeit in Anspruch nehmen.

Roughly translated: On the accident site a larger number of mobile phones and cameras owned by passengers and crew were secured. Some of recorders were heavily damaged. Until the publishing of interim report it was possible to read data from some devices. Repair and downloading data from the majority of recorders is in progress and will take longer time.

Note: German nor English is not my native language so sorry if is not perfect.