What is the correct PPE recommended for responding to aircraft incidents with burning composite materials?

Proximity firefighting gear and SCBA (Self-Contained Breathing Apparatus) are indeed the correct choices for responding to aircraft incidents involving burning composite materials. This type of gear is specifically designed to protect firefighters against high-temperature environments typical of aircraft fires, particularly those involving composite materials, which can produce toxic smoke and gases when burned.

The proximity firefighting gear offers thermal protection while allowing for versatility and mobility, which is crucial during emergency response. SCBA provides essential respiratory protection against the harmful inhalation risks posed by smoke and fumes generated by burning composites, ensuring that responders can operate safely in hazardous atmospheres.

In contrast, other types of PPE mentioned in the options may not offer the appropriate level of thermal protection or might not be suited for the specific hazards presented by composite materials during fires. Structural firefighting gear, for example, is generally suited for building fires and might not provide adequate protection from the extreme heat typical of aircraft fires. Likewise, liquid splash chemical protective clothing and chemical vapor protective clothing focus on specific chemical risks rather than the high heat and smoke dangers presented by composite material fires.