Canyon Flying and Airflow Dangers in Mountain Ranges 2016533728762299155-blid-6960945797292146105

ขุดหลวงพ่อสมนึก ฝังนาน 5 ปี มาบำเพ็ญกุศล ฮือฮาเลขเด็ด 3 ตัวตรง ถูกเขียนเอาไว้ ก่อนสิ้นใจ

Each year there are unfortunate accidents involving light aircraft as they fly through mountainous canyons. Many of these accidents need not happen and it should be expected by pilots that they can and will experience problems with up and down drafts in mountain ranges.
from: http://ezinearticles.com/?Canyon-Flying-and-Airflow-Dangers-in-Mountain-Ranges&id=117443