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volcanic ash
Definição1
Volcanic Ash is comprised of minerals unique to the volcanic eruption. Minerals common to most volcanic ash are silica together with smaller amounts of the oxides of aluminium, iron, calcium and sodium. The glassy silicate material is very hard and extremely abrasive. Its melting point is below jet engine burner temperature which introduces additional hazards. (refer section 2.1 of ICAO Manual on Volcanic Ash, Radioactive Material and Toxic Chemical Clouds - Doc 9691).
Fonte1
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Flight safety and volcanic ash: risk management of flight operations with known or forecast volcanic ash contamination. Advance edition (unedited). Montreal, 2012. (Doc. 9974)
Fonte2
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Air traffic services: annex 11 to the Convention on International Civil Aviation. 3rd ed. Montreal, 2001.
Contexto
2.20.2 Close coordination shall be maintained between area control centres, flight information centres and associated meteorological watch offices to ensure that information on volcanic ash included in NOTAM and SIGMET messages is consistent.
Subárea
Aeronautical Meteorology
Related Term
volcanic (ash) cloud
volcanic ash advisory centre
volcanic ash advisory information
Français
cendre volcanique
Imagem

 Austral’s Embraer 190 covered in volcaninc ash at Bariloche airport, Argentina.

Austral’s Embraer 190 covered in volcaninc ash at Bariloche airport, Argentina.

Fonte: IDIARTE, Marcelo. O problema das cinzas vulcânicas. In: CAVOK: asas da informação, jun. 2011. Disponível em: http://www.cavok.com.br/blog/o-problema-das-cinzas-vulcanicas/. Acesso em: 20 maio 2015.

 Volcanic ash: invisible threat. The microscopic powder can be devastating.

Volcanic ash: invisible threat. The microscopic powder can be devastating.

Fonte: IDIARTE, Marcelo. O problema das cinzas vulcânicas. In: CAVOK: asas da informação, jun. 2011. Disponível em: http://www.cavok.com.br/blog/o-problema-das-cinzas-vulcanicas/. Acesso em: 20 maio 2015.