A number of unknown factors about the VOLCANIC ASH are;
1)- whe are not aware of the ASH concentration in the BA09 and KLM Incident in 1982
2)- The INFLUANCE of VOLCANIC ASH is very differente in functie of the TYPE of TURBINE in function of the temperature in the combustion area inside the turbine
3)- the location of the ASH CLOUD is possible apaerently via the information from SATELITE and combined with STANDARISED GROUND MEAUSUREMENTS??
4)- But the DENSITY of ASH is still a unknown information
5)- ther are a hich amounth of active vulcano at GLOBAL leven a so called expert mentioned 888 of them . but many of them are inactive presently
6) THERE is need to NEUTRAL SCIENTIFIC information outside of the present CRISIS situation dominated by the POLITICAL WORLD
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