SpaceX Returns Falcon 9 to Flight After Fixing Engine Bubble Issue

Quick Investigation Clears Path for Starlink Mission

SpaceX successfully returned its Falcon 9 rocket to flight on Saturday afternoon, launching 25 Starlink satellites from Vandenberg Space Force Base at 3:58 p.m. Eastern time after a brief five-day investigation into an upper stage malfunction. The rocket deployed its payload of satellites into orbit about 62 minutes after liftoff , marking a swift resolution to the company's latest technical challenge.

The issue stemmed from a gas bubble in a transfer tube that prevented the upper-stage engine from igniting for its deorbit burn during the previous mission on February 2. The stage reentered the atmosphere about 10½ hours later over the Indian Ocean , with no reports of debris or damage to third parties.

This incident represents the fourth Falcon 9 upper-stage issue in the past 19 months , highlighting ongoing challenges with the rocket's second stage despite its overall reliability record. The Federal Aviation Administration cleared SpaceX to resume flights after reviewing the company's investigation findings.

Testing Program Aims to Eliminate Space Debris

SpaceX explained that teams have been "actively and safely testing opportunities to refine the pre-burn engine chill profiles, specifically targeting the deorbit burn after the safe deployment of Starlink satellites" to improve space safety protocols. The goal is "to ultimately ensure space safety, effectively ensuring that all Falcon second stages completely deorbit, leaving behind no space debris" .

The company's efforts appear to be paying off. In 2024, 13 of 134 Falcon 9 upper stages remained in orbit after payload deployment, while only three of 165 did so in 2025 . This dramatic improvement demonstrates SpaceX's commitment to reducing orbital debris, a growing concern as satellite constellations expand rapidly.

The returning first stage booster, tail number 1088, completed its 13th flight by landing on the drone ship "Of Course I Still Love You" positioned in the Pacific Ocean, marking SpaceX's 568th booster landing to date .

NASA Crew Mission Remains on Track

The successful return to flight clears the way for more critical missions ahead. Completion of the investigation allows SpaceX and NASA to proceed with the launch of the Crew-12 mission to the International Space Station, scheduled for no earlier than February 11 .

NASA determined that "since the Falcon 9 second stage flies a different deorbit profile for NASA's crewed missions, there is no increased risk to crew safety during ascent" , even before the FAA officially cleared the rocket for flight. The four-person crew already arrived at Kennedy Space Center on Friday, with the mission targeting a 6:01 a.m. launch on Wednesday from Cape Canaveral .

Looking Ahead

Saturday's successful mission demonstrates SpaceX's ability to quickly identify, investigate, and resolve technical issues while maintaining its aggressive launch schedule. The company's transparent approach to sharing investigation results and implementing corrective measures reinforces confidence in the Falcon 9's reliability for both commercial and crewed operations.

With the brief stand-down now behind them, SpaceX can focus on its ambitious 2026 launch manifest while continuing to refine the deorbit procedures that will help keep Earth's orbital environment cleaner for future missions. The lessons learned from this latest incident will likely inform ongoing efforts to perfect the rocket's upper stage performance across all mission profiles.