Initial no-go areas defined as those the model predicted to have more than ten billionths of a gram per cubic metre.
After tests and consultation with Airframe and Engine manufacturers:
1. Anywhere with more than 2000 micrograms/cu.m. = No Fly
2. 200 - 2000 micrograms /cu.m. = Can fly with 'precautions', taken by me to mean extra inspections, particularly of engines.
3. < 200 micrograms / cu.m = no threat.
Are the current VAAs issued with the "ten billionths of a gram per cubic metre" delineation?
Or are they defined as being >200 micrograms per cubic metre?
Those
Advisories are still being issued and the ICAO requirements still exist (if only on paper). We can still be held liable for contravening the ICAO guidelines if we incur serious consequences, so we should know what those advisories actually delineate.