What keeps the BA parachute deployment bag in the pack during deployment until three quarters of the canopy has deployed?

The deployment bag of a BA parachute is designed to maintain its connection to the pack until a significant portion of the canopy has deployed. This is crucial because it allows the parachute to open in a controlled manner, ensuring that the canopy inflates properly and efficiently.

The canopy thong tacking effectively holds the deployment bag in place during the initial deployment phase. As the parachute begins to deploy, the tacking is designed to release at the appropriate moment, allowing the canopy to emerge smoothly without obstruction. This mechanism helps manage the deployment sequence, reducing the likelihood of deployment malfunctions.

In contrast, the other options serve different roles within the parachute system. The deployment control strap, for instance, primarily assists with the manual deployment process and does not directly retain the deployment bag during the initial phase of canopy opening. The static line anchor is essential for securing the static line but does not influence the retention of the deployment bag during deployment. Lastly, the aerodynamic stabilizer has a role in maintaining stability and orientation but is not involved in the deployment bag's initial retention. Understanding these different components helps clarify the specific function of canopy thong tacking in the parachute deployment process.