What happens if the flotation equipment deployment system is activated before the aircraft is at rest?

When the flotation equipment deployment system is activated before the aircraft is at rest, the most significant consequence is that crew members may be injured. Activating the flotation system while the aircraft is still in motion could cause the equipment to deploy improperly, leading to unexpected forces and movements that can put crew members at risk. This can happen because the sudden deployment of flotation gear can create sudden changes in the aircraft's center of gravity or cause physical hazards, such as the flotation devices themselves impacting crew members.

The other outcomes suggested by the other options, such as unsuccessful deployment, equipment jamming, or emergency systems failing, may not necessarily occur solely due to the timing of activation, but the priority concern remains the safety of crew members during such critical situations. Ensuring that all systems are activated only when the aircraft is completely stationary helps mitigate risks and enhances safety.