In this FAQ section of the Breathedge walkthrough, you will learn how to create the flashlight and acquire its blueprint.
The flashlight is useful for illuminating dark areas. It doesn't need to be charged nor does it have limited durability - you'll only need to build it once. However, it only shines for a limited amount of time, forcing you to wait a while until it recharges. Head to the destroyed section of the spaceship directly across the capsule's exit, to the cabin with the blue plating.
There you will find the flashlight on one of the corpses. Examine it for the blueprint. Once built, do not forget to place it in your character's equipment (spacesuit). To activate the flashlight, press the corresponding key (MMB by default).