ASHTAM definition
ASHTAM means a special series of NOTAM notifying by means of a specific format of a change in the activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations;
ASHTAM means a special series NOTAM notifying by means of a specific format change in
ASHTAM means a special series Notice To Air Men notifying by means of a specific format change in activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations;