Nancy Grace Roman Telescope's Final Solar Panel and Deployable Aperture Cover Deployments

After each environmental test, the Nancy Grace Roman Space Telescope verifies its moving pieces operate properly. These final checks demonstrate that the solar panels and Deployable Aperture Cover operate flawlessly, ensuring the observatory is ready for the demands of spaceflight.

The mechanisms that drive these deployments are not engineered for gravity, where even large structures move with minimal resistance. The cleanroom’s airflow pushes against the broad surfaces of the solar panels and aperture cover, placing added stress on their hinges. To compensate, engineers conduct these tests behind a temporary plastic windscreen, carefully positioned and lifted into place by a crane.

The Deployable Aperture Cover requires a weight-offloading system to operate here on Earth. Cables are attached to a network of pulleys and chains, effectively counteracting gravity and allowing the structure to move as it would in space.