Neil A. Armstrong Operations and Checkout Building
KSC building where Orion capsules are assembled, tested, and prepared for crew operations.
Last refreshed: 17 April 2026 · Appears in 1 active topic
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Timeline for Neil A. Armstrong Operations and Checkout Building
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Artemis II Moon Mission- Where is the Artemis III capsule right now?
- The Artemis III Orion crew module and European Service Module (ESM-3) are inside the Neil A. Armstrong Operations and Checkout Building at Kennedy Space Center, undergoing functional and pressure testing.Source: briefing
- What is the Operations and Checkout Building at Kennedy Space Center?
- The Neil A. Armstrong O&C Building is where Orion capsules are assembled, tested, and prepared at KSC. It was renamed after Neil Armstrong in 2012.Source: briefing
Background
The Artemis III Orion crew module and ESM-3 are already inside the Neil A. Armstrong Operations and Checkout Building at Kennedy Space Center. ESM-3 arrived from Bremen in August 2024, joined the crew module adapter, and has completed initial power-up. Functional and pressure testing is underway. Whether ESM-3 starts from a corrected baseline on its pressurisation valves, which operated at 10 times the ground-test rate on Artemis II, remains publicly unanswered.
The Neil A. Armstrong Operations and Checkout Building is a large clean-room facility at Kennedy Space Center where Orion crew modules are assembled, tested, and fitted out before integration with the SLS. The building was renamed from the Operations and Checkout Building in honour of Apollo 11 commander Neil Armstrong after his death in 2012. It has been used for every Orion vehicle in the Artemis programme.
The O&C Building sits on the critical path for Artemis III crew readiness. The five open Orion engineering items include ESM pressurisation valves, Pressure Control Assembly, wastewater vent, and O2 manifold leak, none of which have a publicly committed fix date. ESM-3's status inside the building cannot be independently assessed because ESA has deferred its performance review to the June 2026 Council.
