If the GPWS activates, and alerts the pilot with an aural warning "DON`T SINK" (twice), it is because:

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the aeroplane experiences an unexpected proximity to the terrain, with landing gear retracted.

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the aeroplane experiences an unexpected proximity to terrain, without landing-flap selected

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at too low altitude, the aeroplane has an excessive rate of descent.

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during take-off or missed approach manoeuvre, the aeroplane has started to lose altitude.

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