What is the proper procedure for using an oxygen mask on a passenger?

Securing the mask over the passenger's nose and mouth is essential for ensuring that oxygen is delivered effectively in an emergency situation. This proper procedure guarantees that the mask fits snugly and that the passenger can breathe in the supplemental oxygen without any gaps. A well-fitted mask helps to prevent potential suffocation or hypoxia by ensuring a steady supply of oxygen, which is critical in emergencies, such as cabin depressurization or smoke inhalation scenarios.

While giving the mask to the passenger to put on themselves may seem like an option, it does not guarantee that they will fit it correctly or promptly, which could lead to delays in receiving oxygen when it is needed most. Fitting the mask loosely for comfort compromises the effectiveness of the oxygen delivery, making it less likely that the passenger receives an adequate supply. Lastly, using the mask only during landing limits its use to certain phases of flight, ignoring the fact that emergencies can occur at any time. Therefore, understanding and executing the correct procedure is vital for passenger safety.