Definition
A special series of NOTAM that notifies pilots, in a specific format, of changes in the activity of a volcano, a volcanic eruption, or a release of volcanic ash that may affect the safety of flight.
Plain English
An ASHTAM is a volcano warning message issued to pilots. It tells you that a volcano is acting up, has erupted, or is putting ash into the air along routes aircraft might fly.
Context Anchor
Seen during preflight weather and NOTAM review, especially for flights near volcanic areas or routes where ash may drift.
Derivation
The name combines 'ash' (volcanic ash) with 'NOTAM' (Notice to Airmen). It is a NOTAM specifically about ash, so 'ASH' + 'TAM'.
Why Pilots Care
Volcanic ash can cause engine failure and loss of visibility, directly affecting route planning and safety decisions.
Grounding Statement
If a volcano erupts and ash is moving through the airspace, an ASHTAM is one of the notices that warns pilots where the hazard is and when it matters.
Intuition Check
Do not read ASHTAM as a general weather report. It is a specific aviation notice about volcanic ash or volcano activity that can affect flight safety.
Example Sentence 1
During the preflight briefing for the transatlantic route, the dispatcher reviewed an ASHTAM reporting volcanic activity in Iceland.
Example Sentence 2
An ASHTAM warned of ash between 20,000 and 35,000 feet along the planned route.