What are functional tests for?
Exactly, to ensure that there are no unpleasant surprises. After the final parts were finally manufactured and installed, the first retraction and extension tests were conducted. I was quite surprised when, after the first cycle, a bent actuator rod appeared. The threaded rod, which had been screwed out too far, turned out to be too weak to handle the pressure force. A redesign of this transition with a significantly larger diameter solved the problem.
The retraction and extension time is around 13 seconds, which matches the calculated values. The uplock engages reliably and opens just as reliably via the landing gear lever mechanism.
The maximum current of 8.4A during the retraction process also matches the calculations.
The landing gear lever for the cockpit visually mirrors the original lever on its front side.
As a complete novice in electronics, I had to seek help from knowledgeable colleagues for the wiring diagram and rely on schematics from other aircraft for reference.
