Safety stanchions and chains are generally used around open hatches on:

Safety stanchions and chains are primarily utilized around open hatches on flight or hangar decks due to the unique operational environment and safety risks associated with these areas. The flight and hangar decks are critical zones where aircraft operations occur, and personnel must be protected from potential falls or accidents that could happen due to the height or the open structure of the hatches. These safety barriers help ensure that individuals are aware of the hatch openings and maintain a safe distance from the edges, thus preventing accidents.

In the context of other areas like weather decks, combat information centers, or living quarters, although safety measures are essential, the specific design and function of the flight and hangar decks necessitate a more pronounced application of safety stanchions and chains due to the heightened activity levels and the exposure to operational hazards. This makes the use of such safety features particularly relevant in maintaining safety standards in those bustling environments.