What is the primary danger to an aircraft encountering low-level wind shear during the takeoff or landing phase of flight?

1. A sudden loss of airspeed and lift that can cause the aircraft to descend rapidly below the glide path before the pilot can recover
2. A sudden increase in fuel consumption due to changes in air pressure
3. Structural damage to the wings caused by localized pressure changes
4. The failure of gyroscopic flight instruments due to rapid aircraft roll rates