What actions should be taken with caution to prevent additional internal FOD?

The action of "Opening and closing" is particularly critical in preventing additional internal Foreign Object Damage (FOD) because it directly relates to the potential for foreign objects to enter sensitive areas within an aircraft or machinery. During the process of opening any compartments or access panels, there is a risk of leaving tools, equipment, or even debris inside the structure. Proper protocols must be followed during this action to ensure that all items are accounted for and that no objects are inadvertently left inside.

When closing these compartments, extra care must also be taken to ensure that no small items are caught in the closures, which could also lead to internal FOD issues. The process requires vigilance and awareness of the environment to maintain a clean and safe area. This involves double-checking that all tools are removed and ensuring that no materials are misplaced during both the opening and closing phases.

The other actions involve either moving items (like loading and unloading) or securing them (like sealing and packing), which while important, are not as directly tied to the introduction of internal FOD as the careful process of opening and closing access points. This makes the focus on "Opening and closing" more pertinent to the prevention of internal FOD incidents.