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Aviation Toxicology

Aviation Toxicology. Dr. Saeid Akbari IRANIAN CIVIL AVIATION ORGANIZATION.

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Aviation Toxicology

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  1. Aviation Toxicology Dr. Saeid Akbari IRANIAN CIVIL AVIATION ORGANIZATION

  2. The pathological investigation of fatal aircraft accident victims relies on analytical toxicology to establish the nature and concentration of substances such as alcohol, drugs and products of combustion that may have impaired the aircrew and so contributed to the accident, or impaired the passengers in their attempts to escape the crashed aircraft.

  3. LD50 LD50 : The dose expected to be lethal in 50% of the animals. The LD50 is expressed in mg/kg of body weight ( milligrams/kilogram )

  4. LC50 LC50 : The concentration expected to be lethal in 50% of the animals. The LC50 is expressed in part per million ( ppm )

  5. The LD50 and LC20 allow a ranking of chemicals from extremely toxic ( LD50 less than 1mg/kg or LC50 less than 50 ppm ) to relatively harmless ( LD50 more than 15 g/kg or LC50 more than 100000 ppm )

  6. Particles greater than 10 micrometer are filtered out by the nose, particles between 10 micrometer and 5 micrometer are trapped in the bronchi and are removed by the cilia. Particles smaller than 5 micrometer reach the alveoli and may cause disease.

  7. Particles greater than 10 micrometer are filtered out by the nose, particles between 10 micrometer and 5 micrometer are trapped in the bronchi and are removed by the cilia. Particles smaller than 5 micrometer reach the alveoli and may cause disease.

  8. Sources of toxic hazards in flight 1. Products of combustion: engine exhaust gases; products of overheating or fire. 2. Aviation fuels, lubricants and hydraulic fluids. 3. Anti-icing, anti-detonant and coolant fluids. 4. Fire extinguishing agents. 5. Refrigrants. 6. Ozone. 7. Insecticides, herbicides and agricultural chemicals.

  9. Chemical hazards to ground crew are provided mainly by aircraft fuels, lubricating oils, hydraulic oils, anti-icing fluids and coolants. These substances may be hazardous because they are potentially explosive, flammable, toxic, corrosive or irritant, or they may present a hazard to the environment when spilled.

  10. FUELS Fuels, composed essentially of hydrocarbons, present the greatest risk since they are present in very large volumes and are extremely flammable. There is therefore a risk of explosion and fire. Spillage of fuel onto the skin or clothing may cause chemical burns and inhalation of high concentration in poorly ventilated area may cause headache and ultimately narcosis.

  11. Lubricating oil and hydraulic fluids : These fluids are not volatile and are less flammable than fuel. They may cause sensitization if they come into contact with the skin or eyes.

  12. Anti-icing fluids: In aqueous solutions these substances do not present a particular hazard, however skin contact is best avoided. Accidental ingestion of moderate quantities of ethanediol can be fatal and medical assistance must be sought in this case.

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