Definition
An onboard avionics system that uses aircraft position, altitude, and a database of terrain and obstacles to alert the pilot when the aircraft is approaching rising ground or an obstacle that could result in a collision. TAWS provides both cautionary and warning alerts, typically through visual displays and aural callouts, allowing the pilot time to take corrective action before terrain becomes a hazard.
Plain English
A system in the cockpit that watches the ground and obstacles ahead and warns the pilot if the aircraft is getting too close to them.
Context Anchor
Seen in aircraft equipment descriptions, cockpit warning discussions, and training scenarios involving terrain, night flying, poor visibility, or low-altitude operations.
Derivation
The name describes the function plainly: 'terrain awareness' means knowing where the ground is, and 'warning system' means it alerts you when there is a problem. The system was developed after a long history of accidents in which otherwise functional aircraft were flown into mountains or rising ground in poor visibility.
Why Pilots Care
Provides advance warning that helps prevent controlled flight into terrain accidents.
Intuition Check
TAWS is not just a map, and it is not a guarantee that terrain is safe. It is a warning system that alerts the pilot when the aircraft’s path may put it too close to terrain.
Example Sentence 1
During the night approach into mountainous terrain, the TAWS issued a 'Caution Terrain' alert, and the pilot immediately leveled off and reviewed the approach path.
Example Sentence 2
During the approach briefing the instructor pointed out the TAWS display features on the multifunction screen.