Which fire extinguishing agent is considered safest for use in turbojet airplanes based on toxicity and corrosion?

Carbon dioxide is considered the safest fire extinguishing agent for use in turbojet airplanes primarily because it is non-toxic and non-corrosive. In turbojet environments, where sensitive avionics and materials are prevalent, using an agent that does not pose a risk of toxicity to crew or passengers is crucial, especially in the event of a fire.

When carbon dioxide is discharged, it displaces the oxygen around the fire, effectively smothering it without leaving any residue that could cause corrosion or damage to aircraft components. This is particularly important in jet aircraft where any contaminants can lead to malfunction or deterioration of critical systems.

Other agents like Methyl Bromide and Chlorobromomethane, while effective in certain scenarios, may present health risks due to their toxic nature and potential for long-term environmental effects. Water, though generally safe, may not be practical in certain aviation fire scenarios, especially with flammable liquids and in the potential freezing conditions at high altitudes. Additionally, water can cause corrosion to various aircraft materials, which is not a concern with carbon dioxide. Thus, carbon dioxide stands out as the safest choice for fire extinguishing in turbojet airplanes.