Operational Proceduresmedium#1039
The contamination level at which flight operations are restricted in volcanic ash is defined by:
A
Ash concentration of 2 mg/m3 as the no-fly threshold
B
Red, Orange, Yellow alert levels
C
Low, Medium, High contamination areas
CorrectD
SIGMET warnings only
Explanation
ICAO defines Low, Medium, and High contamination areas for volcanic ash. High contamination areas are no-fly zones.
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