What defines the timing for deployment of the seat survival kit during an ejection?

The deployment of the seat survival kit after a predetermined delay following ejection is based on operational safety considerations. This timing allows for several crucial factors to align before the kit is deployed, ensuring the safety and effectiveness of its function. Specifically, the delay ensures that the ejection seat, the pilot, and the survival kit can separate cleanly from the aircraft, avoiding any interference or entanglement that might occur if they're deployed simultaneously.

This process helps to ensure that the individual has a clear escape path and reduces the risks associated with high-speed ejections, where the forces involved could potentially complicate survival kit deployment. The delay also allows the pilot to stabilize in free fall before the survival kit is deployed, enhancing its accessibility and usability once the parachute opens. Overall, the timing after a predetermined delay is carefully chosen to maximize the effectiveness of the survival kit while minimizing risks during the ejection process.