A failure of the CQU-7/P blower is indicated to the wearer by which of the following?

The correct answer is related to the functionality of the CQU-7/P blower, which is designed to provide airflow that aids in both cooling the wearer and preventing condensation on the visor of the helmet or facepiece. When the blower fails, one of the immediate consequences is the loss of lens demist. This is critical as a foggy or misted visor can severely impair visibility, which compromises safety during flight operations.

The blower's main function is to keep the visor clear by maintaining a flow of air that prevents moisture condensation. If this function is compromised, the individual will notice that their visor becomes foggy, indicating that the humidity inside the helmet is no longer being managed effectively. This fogging occurs because the cooler air outside meets the warmer, moist air inside, leading to condensation on the lens.

The other options, while they may pertain to various aspects of the helmet system, do not directly correlate with the specific failure of the blower in the same way that loss of lens demist does. Therefore, recognizing that fogging is a direct indicator of a blower malfunction helps in identifying critical equipment issues quickly to maintain operational effectiveness.