Plain English Meaning

A little shield placed at the static port that blocks rain and debris from getting inside, but still lets outside air pressure through so the instruments can sense it.

Full Definition

A small metal vane or plate fitted near the static port opening to prevent rain, ice, dirt, or other foreign matter from entering the static system, while still allowing ambient air pressure to reach the static line.

Context Anchor

Seen in diagrams of the pitot/static system, especially the internal parts of a pitot tube connected to the airspeed indicator.

Derivation

From the verb 'baffle,' meaning to block, deflect, or restrain. The plate (deflects) unwanted away from the opening.