Ground Proximity Warning System (GPWS)

[Audio] Ground Proximity Warning System: G P W S is used to avoid potential risks by alerting pilots to improper landing configuration and terrain collision circumstances. The system tracks the flight path and activates appropriate aural and visual indications. The G P W S includes five basic modes active up to height of 2,500 feet: Mode 1: Excessive rate of descent Mode 2: Excessive terrain closure rate Mode 3: Altitude loss after takeoff or go-around Mode 4: Terrain clearance not sufficient, if not in landing configuration Mode 5: Excessive descent below the glide slope.

[Audio] Notes: The terrain data, which is shown on the Navigation display, as well as the brightness, can be managed with the aid of the weather radar brightness switch. The brightness of the terrain display becomes low depending on the weather radar brightness, which also causes a terrain alert..

[Audio] Mode 1 - Excessive Rate of Descent: In case of excessive descent rate regarding radio height, the aural and visual alerts are activated. Mode 1 is operative for all flight phases..

[Audio] Mode 2 – Excessive Terrain Closure Rate: In case of excessive rate of terrain closure, the aural and visual alerts are activated when the rising ground is detected. Sorts of Mode 2: Mode 2A Configuration is when the flaps are not in landing position Mode 2B Configuration is when the flaps are in landing position.

[Audio] Mode 3 - Altitude Loss After Take-off: In case of significant descent during the climb after take-off, either landing gear or flaps are not in proper configuration during the go-arounds, the aural and visual alerts are activated..

[Audio] Mode 4 - Unsafe Terrain Clearance When Not In Landing Configuration: In case of inadequate terrain clearance depending on flight stage, landing gear and flaps configuration, and the speed, the aural and visual alerts are activated. Sort of Mode 4: Mode 4A Configuration is when the landing gears are retracted Mode 4B Configuration is when the flaps are improper landing position Both are operative during cruise and approach..

[Audio] Mode 5 - Descent Below Glideslope: In case of flying beneath the glideslope, the aural and visual alerts are activated..

https://pilotspace.co.uk/guides/a320-memory-items/lessons/a320-gpws/.