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SpaceX today released an update on its investigation of the September 1 Falcon 9 launchpad explosion.
Previously, we announced the investigation was focusing on a breach in the cryogenic helium system of the second stage liquid oxygen tank. The root cause of the breach has not yet been confirmed, but attention has continued to narrow to one of the three composite overwrapped pressure vessels (COPVs) inside the LOX tank. Through extensive testing in Texas, SpaceX has shown that it can re-create a COPV failure entirely through helium loading conditions. These conditions are mainly affected by the temperature and pressure of the helium being loaded.
SpaceX’s efforts are now focused on two areas – finding the exact root cause, and developing improved helium loading conditions that allow SpaceX to reliably load Falcon 9. With the advanced state of the investigation, we also plan to resume stage testing in Texas in the coming days, while continuing to focus on completion of the investigation.
The report suggests that they are starting to pin down the very specific temperature and pressure conditions during loading of the helium tank that cause the problem, which also suggests they will soon also be able to adjust their procedures to avoid those conditions. This also suggests that they repeated assurances that they will be able to fly before the end of the year are not unreasonable.