What should you do after donning your oxygen mask during decompression?

After donning your oxygen mask during decompression, the immediate step is to fasten your seatbelt or grasp a fixed object. This action is crucial for your safety and stability, as decompression can lead to turbulence or rapid changes in altitude that might cause you to be thrown from your seat. Securing yourself ensures that you maintain your position and can safely manage the situation as it unfolds.

In the context of cabin decompression, it is vital to prioritize securing oneself before attending to other tasks. This response not only protects you but also allows for better oversight when monitoring the situation and assisting others thereafter. Remaining seated and secured will help maintain order and safety within the cabin during an emergency, making it imperative that your personal safety is managed first.

Other actions, like leaving your seat to assist passengers or reassuring them, could compromise your own safety and potentially exacerbate the situation. While reassuring passengers and waiting for instructions are important, these actions should take place only after ensuring your own safety by fastening your seatbelt.