I'm taking the Airbus A320 for illustration, but any comparable civil aircraft can be explained. By the way, the electronics bays of the A380 and of the A320 look the same; apparently no big change occurred.

On this aircraft the main electronics bay 80 VU contains multiple systems:

diagram showing systems in avionics racks
A320: 80VU avionics racks, source

Corresponding view:

photo corresponding to the above diagram
A320, photo by B-2230, source: JetPhotos

Question: How is the electronic equipment locked (it seems there are two mobile screws) and how are the wires connected? Details will be appreciated: standards, diagrams, images...

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    $\begingroup$ This company page (not affiliated) seems to provide better images of the various trays and fasteners: avionicshardwareandmounts.com $\endgroup$ – selectstriker2 Dec 1 '17 at 14:47
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    $\begingroup$ And this company's product catalog seems to provide some illustrations of the hold down mechanisms: arconic.com/fastening_systems_and_rings/aerospace/catalog/pdf/… $\endgroup$ – selectstriker2 Dec 1 '17 at 14:51
  • $\begingroup$ @selectstriker2: Very good finds, that's more than what I was looking for. $\endgroup$ – mins Dec 1 '17 at 14:53
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    $\begingroup$ @selectstriker2 I totally think you should add that to your answer, it completes it quite nicely $\endgroup$ – Federico Dec 1 '17 at 15:25

The LRUs are attached to trays which house the electrical connectors and the cabling behind them: enter image description here source

The hold down mechanisms vary in design, but it appears they generally attach the LRU to the tray at the front, the back likely being held in by the electrical connectors at the back.

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    $\begingroup$ The LRUs slide into the trays and are electrically mated at the rear. There are small hooks on the bottom front of the LRUs. The hold down is a screw collar on the bottom front of the tray that swings up and is screwed down over the hook. Additionally, the trays support forced-air cooling of the LRUs. Air is forced up through the LRUs (the plastic on the bottom of the trays in the pic is a flow restrictor.) It's all spelled out in ARINC Characteristic 600. $\endgroup$ – Gerry Dec 1 '17 at 17:00

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