What is the prior step before placing the headset back on during the O2 max donning procedure?

In the O2 max donning procedure, the critical step before placing the headset back on is to don the oxygen mask. This ensures that the crew member has a secure and functional oxygen supply before they fully prepare for communication or operation duties. Properly donning the oxygen mask first allows for any necessary adjustments to be made to the mask itself, ensuring a tight fit and effective seal, which is essential for delivering oxygen properly and preventing any potential leaks. Once the mask is secured and working effectively, the headset can then be placed back on, allowing for clear communication while utilizing the oxygen supply effectively. This step is vital in ensuring that safety protocols are followed correctly.