Tailpipe fires may spread to what kind of fires?

• A. Ground fires only
• B. Ground or 3D fires
• C. Aerial fires only
• D. Indoor fires

Answer: (B)

Tailpipe fires contain extremely hot exhaust and can emit embers and radiant heat that reach beyond the immediately burning area. This heat can ignite fuels on the ground, such as spilled fuel or dry debris, and it can also propagate into surrounding three-dimensional spaces around the aircraft—like wing root areas, engine nacelles, pylon regions, and other compartments—through openings, gaps, or ducts. Because of this dual capability, tailpipe fires are capable of spreading to both ground fires and 3D fires, not just one specific setting. The options that limit spread to only ground, only aerial, or only indoor fires don’t reflect the way heat and embers can move around and into surrounding structures.