Oh oh. Some questions to answer for LH Bombardier Aviation Service... News from Spiegel online:
Ministry checks whether Lufthansa subsidiary has made maintenance errors
Following the dangerous crash landing of a government aircraft in Berlin-Schönefeld earlier this week, Federal Defence Minister Ursula von der Leyen is investigating whether there are systemic problems with the maintenance of the so-called White Fleet by a Lufthansa subsidiary. As early as Wednesday, General Flight Safety was therefore instructed to investigate the Tuesday accident as well as several other incidents of the past months.
The investigation by the chief flight investigator of the Bundeswehr is concerned with the question of whether the external maintenance of government jets was carried out with the necessary care. The investigators already suspect that the massive problems of a "Global 5000" government aircraft on Tuesday were caused by incorrect wiring of the spoilers on the wings of the jet.
Since the business jet came directly from Lufthansa Bombardier Aviation Services' maintenance operations, it is reasonable to assume that it was not operated carefully. The incorrect adjustment of the spoilers was extremely dangerous. The pilots were already in a dangerous slant in the air, and there was even a stall. During the emergency landing the jet missed the runway, slid over the lawn and was massively damaged.
This is not the first time that there have been doubts about the maintenance of government aircraft by Lufthansa.
More here: https://www.spiegel.de/politik/deuts...a-1263809.html

Translated with www.DeepL.com/Translator

I doubt incorrect wiring, more than likely incorrect electronic rigging (after mechanical rig, spoilers have to be electronically rigged, so computers know where they are).

Ttfn

Torque tube assembly
 

was incorrectly wired or mounted by LBAS. Spoilers were actuated on the wrong side. (mirrored) Pilots couldnt detect it during pretaxi check as the indicator shows spoiler activity only, but not on which side. Translation from Spiegel today.

That bit in bold is nonsense, as the synoptic display posted in post #22 shows - all spoiler panels are depicted individually on the display.

Be it so, also, I would expect that there is a visual live outside check by the AMPs, demanded by the AMM, after work was performed on a critical component like this one. Safety category: catastrophical, no doubt.

According to BILD, a chain of mistakes by maintenance AND pilots leads to the near crash landing. It has a paywall, so I translated some parts.
https://www.bild.de/bild-plus/politi...ogin.bild.html

According to BILD information, sloppiness is supposed to be the main cause. In concrete terms: Lufthansa's technicians as well as the air force pilots did not carry out all the required checks. Officially, the investigations are still being carried out by the "General Flugsicherheit" of the Bundeswehr.
...
Meanwhile Lufthansa circles say that a chain of mistakes and carelessness led to the near crash. Error 1: Incorrect wiring of the spoilers on the wings. So much was known. Reason: Maintenance breakdowns at the responsible maintenance company "Lufthansa Bombardier Aviation Services". Error 2: Missing checks! After completion of maintenance, the technicians must actually release the aircraft on the basis of a checklist. Lufthansa Technik confirmed this to BILD: "Regardless of the specific case, a maintenance and overhaul company releases an aircraft from service after maintenance or overhaul work has been carried out". However, the government aircraft obviously did not receive such a carefully performed check to declare "airworthiness". Error 3: Obvious negligence on the part of the pilots. Because they also have to carry out routine checks before take-off, during which the wrong wiring of the spoilers should have been noticed on the ground. And even in the air there would be possibilities to switch off the wrongly wired spoilers. That was omitted.

Translated with www.DeepL.com/Translator

Although I do not know the exact technical problem they had, If they suspected (the pilots) spoiler problems, they could have deactivated them.

Where in the QRH is that procedure? (De-activate the spoilers).

N
 

So, as I suspected, something was wired incorrectly. Which brings us back to the question I asked earlier.

With the incorrect wiring, would the display show what had been asked for, or what was actually happening?

There wouldn't be much point in having the display if it didn't show, for example, a spoiler that failed to move when a controls check was carried out.

So, without knowing the GLEX family in detail, I'd be very surprised if it wasn't actual surface position that is being displayed.

I have never previously encountered anyone else stupid enough to do that. I would have been a bit older.

I say I fell off instantaneously.

I wondered if it might "solve" these though -
https://www.ebay.co.uk/itm/Reverse-S...-/173148288866
Reverse Steer Bike - Fair Ground Bicycle Challenge

mjv seems to answer your question here - actual spoiler position is sensed.

LVDT are position sensors. Linear Variable Differential Transformer. Produce a changing AC voltage depending on the sensed position.

German public broadcaster ARD, quoting newsweekly Der Spiegel, reports that the accident report has been finished. Mix-up in control logic, due to maintenance error. Aircraft written off after suffering 5,8 g load during pullout from the initial loss of control.

http://www.tagesschau.de/inland/ursa...ieger-101.html (in German)

If find it incredible that such a condition could arise (inverted flight controls in actual flight, not caught at any step before) and equally amazing that the crew walked out of that one.

This is the actual touchdown. It hit the ground with both wingtips and landed on the grass being steered back onto the runway afterwards.
It's roll control input module had been installed in a wrong way during maintenance. This went unnoticed by both maintenance and crew as the final report by the military found out.
https://www.spiegel.de/politik/deuts...8-1418983.html

Source: Spiegel/DPA

So all primary flight controls were OK. They worked in fine and in the correct direction!
A set of reversed secondary flight controls (spoiler system) brought down the jet?
Does LBAS get paid for the maintenance job which ended in an aircraft write-off?