What happens during the deployment phase of the SSK?

During the deployment phase of the SSK (Survival Seat Kit), the correct action is that the locator radio begins transmitting. This is a critical part of the deployment process, as it allows for the location of the ejected pilot to be established and assists rescue efforts. The locator radio is designed to signal the pilot's position to search and rescue teams, enhancing the chances of a timely and effective recovery.

While the other options may seem relevant, they do not accurately describe the primary function that occurs specifically during the deployment phase of the SSK. For example, the separation of the seat from the aircraft occurs prior to the deployment phase, while the deployment of the main parachute is part of a subsequent stage after the SSK has been fully engaged. Similarly, emergency oxygen may still be necessary depending on the altitude and circumstances surrounding the ejection, but it does not directly pertain to the deployment phase itself.