The text of LBB A7, p23 is mostly "not relevant" to the context of the image.
My personal best guess is that you're looking at some kind of wreckage recovery/salvage operation on a vacuum world surface (hence the vacuum suits). The starship is landed with troops marching out of an airlock on the left side of frame. In the center foreground a fire team of troops are scouting the area to set up a perimeter. The mound they're marching over has been impacted (see crater on the right). Whatever crashed here is in broken pieces just over the crest of the hill, where a recovery team is gathering up wreckage.
The item you're referring to in the image looks like some kind of "broken off landing gear pylon" that would have belonged to some other ship that presumably crashed here. Alternatively, it could be an above surface access point to an underground installation that is now something of an abandoned ruin.
The ship's air/raft is visible above the "equator" line of the starship between the center and left pylons in the image. Although it is not clear in this image, I would imagine that the air/raft is being used for overwatch and survey around this location.
My overall impression of the story/narrative context of what you're looking at is that "something BAD happened here" and the troops of this particular Broadsword class ship are fanning out to secure the site, gather up evidence and try to work out what occurred. You're looking at (space) infantry recon.
As for exactly what THIS might be ...
... I have no useful idea. My best guess is that it's an intact piece of something else that is no longer intact, but that's about as far as I can go.