SSD,
I have a Yak52 question for you.
As a preamble for those who don't know the Yak, the gear is raised and lowered (with a very satisfying pneumatic hiss) by a robust lever on the lower left of the panel. The lever is mechanically locked in its position by a bolt that slides horizontally across the gear lever slot:
After a landing during my checkout last year, I noticed that I had forgotten to slide the bolt across after lowering the gear.
So, without the bolt, is there a risk of the gear lever moving to the Up position on its own or is the bolt only there to protect against pilot stupidity?