Which aircraft systems may increase hazards during firefighting operations?

The correct choice identifies electrical systems and pressurized fuel systems as aircraft systems that may increase hazards during firefighting operations.

Electrical systems can present a significant risk due to the potential for electrical fires, which are often challenging to extinguish. In addition, electrical systems are integral to various aircraft components, including fuel pumps and control systems; thus, a malfunction or damage in these areas can not only lead to ignition sources but might also hinder firefighting efforts if critical systems fail.

Pressurized fuel systems pose another serious risk in firefighting scenarios. High-pressure fuel lines can lead to fuel leaks or ruptures, which may cause explosive hazards when they come into contact with flames or heat. Since fuel is highly flammable, any breach in the system could escalate a fire very quickly, complicating the firefighting operation.

Understanding these hazards is crucial for enhancing safety protocols and response strategies when addressing aircraft emergencies.