Rocket Lab announced plans to reuse the booster from their "Four of a Kind" mission (launched on January 31st, 2024). No mention of reusing the engines from that flight, so those may be new. Reusing the booster but not the engines would be consistent with Rocket Lab's iterative approach to reuse.
https://investors.rocketlabusa.com/news/news-details/2024/Rocket-Lab-Returns-Previously-Flown-Electron-to-Production-Line-in-Preparation-for-First-Reflight/default.aspxTests this booster has already passed:
Tank pressurization test – a process that filled the carbon composite tank with inert gas and held it in excess of maximum operating pressure for more than 20x longer than the standard Electron flight duration;
Helium leak check – a stringent process that determines there are no leaks in the tank; and
Carbon fiber structural testing – including ultrasonic assessment and other non-destructive tests to confirm no delamination of the carbon composite tank fibers.
It will now undergo final fit out and qualification and acceptance testing (same as a new booster would), and if it meets those standards, it will be reused.
Edit: One detail I missed initially is that this booster won't be reflown until 2025. According to Peter Beck, "If this stage successfully passes and is accepted for flight, we’ll consider opportunities for reflying it in the new year."
Must of done destructive testing on earlier recovered boosters to be this confident.
Next recovery step was meant to be flying 9 recovered engines (engine pod?). This may yet happen before this booster's mission.
Rocket Lab announced plans to reuse the booster from their "Four of a Kind" mission (launched on January 31st, 2024). No mention of reusing the engines from that flight, so those may be new. Reusing the booster but not the engines would be consistent with Rocket Lab's iterative approach to reuse.
https://investors.rocketlabusa.com/news/news-details/2024/Rocket-Lab-Returns-Previously-Flown-Electron-to-Production-Line-in-Preparation-for-First-Reflight/default.aspx
Tests this booster has already passed:
Tank pressurization test – a process that filled the carbon composite tank with inert gas and held it in excess of maximum operating pressure for more than 20x longer than the standard Electron flight duration;
Helium leak check – a stringent process that determines there are no leaks in the tank; and
Carbon fiber structural testing – including ultrasonic assessment and other non-destructive tests to confirm no delamination of the carbon composite tank fibers.
It will now undergo final fit out and qualification and acceptance testing (same as a new booster would), and if it meets those standards, it will be reused.
Edit: One detail I missed initially is that this booster won't be reflown until 2025. According to Peter Beck, "If this stage successfully passes and is accepted for flight, we’ll consider opportunities for reflying it in the new year."
Really exciting news, even if the actual reflight is still a ways away. The sooner they nail re-usability, the more they'll benefit in the long term.