Not a "one size fits all" threshold, but legally binding measures which will require engine manufactures to provide detailed information about risk associated with volcanic ash exposure and tolerance levels of the different engines they produce.
Ühe künnisväärtuse asemel tahetakse kehtestada õiguslikult siduvad meetmed, millega nõutakse lennukimootorite tootjatelt iga mootori kohta üksikasjalikku teavet, milline on risk vulkaanilise tuhaga kokku puutudes ja milline on mootori taluvustase.