Final answer:
The secondary restraint device on the CSU-23P anti-grav suit serves as a backup system in case of a slide fastener failure, ensuring the suit remains securely fastened.
Step-by-step explanation:
The primary purpose of the secondary restraint device on the CSU-23P anti-grav suit is to provide a backup system in the event of a slide fastener failure. The secondary restraint device is designed to secure the suit and prevent any accidental opening or detachment if the primary fastener fails.
For example, if the main zipper on the suit fails, the secondary restraint device, such as a secondary zipper or buckle system, would come into play to keep the suit closed and secure. This ensures that the anti-grav suit maintains its intended functionality and protects the wearer in anti-gravity environments.
Overall, the secondary restraint device serves as a safety measure to mitigate the risk of a catastrophic failure in the event of a slide fastener failure, providing a redundant system to keep the suit securely fastened and the wearer safe.