SpaceX announced on Monday that the explosion of its Starship vehicle last month was triggered by a series of cascading events related to propellant leaks, a concern the company claims has now been rectified in preparation for a potential eighth test flight as early as Friday.
Currently, SpaceX is awaiting a decision from the Federal Aviation Administration (FAA) regarding the conclusion of the “mishap investigation” linked to the explosion. Alternatively, the FAA may grant special permission for the flight to proceed while the investigation is ongoing.
This marks the first mishap investigation SpaceX has undergone with CEO Elon Musk actively engaging with the US government, where his team is making efforts to reform FAA processes. The agency has not provided immediate comments regarding the situation.
The test flight in question began successfully, allowing SpaceX to trial various enhancements to the Super Heavy booster, the launch-and-catch tower, and the Starship itself. The vehicle lifted off without incident, with the booster returning safely to Texas where it was caught by the tower.
However, approximately two minutes after Starship ignited its rocket engines to enter orbit, issues arose. According to a company blog post, a flash was reported in the aft section near one of the Raptor vacuum engines. This moment prompted onboard sensors to detect pressure increases, indicative of a propellant leak.
A subsequent flash occurred two minutes later, leading to what SpaceX described as “sustained fires” in the affected area due to the leaks. These fires triggered controlled shutdown sequences for all but one engine and ultimately caused a loss of communication with the vehicle.
SpaceX attributed the leaks to unexpected vibrations resulting from the test, which placed stress on the propulsion hardware. An automated in-flight abort system subsequently led to the ship’s destruction following the fires and subsequent communication failures.
The explosion created a dramatic scene over the Turks and Caicos Islands and resulted in the FAA rerouting several flights to ensure safety. SpaceX has stated that all debris from the Starship fell within a designated safe zone, which is typically arranged with governmental authorities prior to launches. Local residents reported debris washing up on beaches, and at least one vehicle incurred minor damage from the incident.
In response to the failure, SpaceX has implemented modifications to the fuel lines that supply the Starship’s engines, adjusted the propellant temperature, and added additional vents along with a new purge system. These changes aim to enhance the resilience of the aft section against potential propellant leaks.
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