Definition
An onboard avionics system that uses aircraft position, a terrain and obstacle database, and aircraft performance data to alert the pilot — visually and aurally — when the aircraft's flight path is in danger of intersecting terrain or obstacles. TAWS provides earlier and more predictive warnings than older ground proximity systems by looking ahead along the projected flight path rather than only directly below the aircraft.
Plain English
A system in the aircraft that watches where you are flying and warns you, with alerts and voice callouts, if you are getting too close to the ground, a hill, or an obstacle.
Context Anchor
Seen on a multi-function display, moving map, or terrain display during instrument flying, especially when the system shows colored terrain areas or gives a terrain warning.
Derivation
Built from three plain words. Terrain means the shape of the ground. Awareness means knowing where it is in relation to you. Warning System means it tells you when something is wrong. The full name describes exactly what it does — keeps the pilot aware of the ground and warns of conflict with it.
Why Pilots Care
It helps prevent controlled flight into terrain accidents by giving early, clear warnings in low visibility or mountainous areas.
Analogy
It is like a forward-looking safety alert in a car, but for terrain around an aircraft. It does not steer for you; it warns you that a dangerous situation may be developing.
Intuition Check
Do not assume the system guarantees terrain clearance. It is a warning aid; the pilot still must maintain safe altitude and respond correctly to the alert.
Example Sentence 1
As they descended into the mountainous approach, the TAWS displayed rising terrain in yellow and red on the MFD, prompting the pilot to verify altitude against the chart.
Example Sentence 2
During the instrument approach the pilot monitored the Terrain Awareness Warning System display for any rising terrain ahead.