A SpaceX countdown abort delays 21 Space Development Agency satellites
Key takeaways
- SpaceX aborted the T1TL-A launch at 4:28am EDT on 5 October, in the final minute of the count
- The mission carries 21 Northrop Grumman satellites from Vandenberg, and SpaceX has not given a reason
- A retry was set for 1:17am PDT on 6 October
SpaceX called off the launch of 21 Space Development Agency satellites in the final minute of the countdown on Monday 5 October. The abort came at 4:28am EDT, as the Falcon 9 was shifting into its automated startup sequence. SpaceX did not give a reason straight away.
What was supposed to fly
The mission is Tranche 1 Transport Layer A, or T1TL-A, from Space Launch Complex 4 East at Vandenberg Space Force Base. The 21 satellites were built by Northrop Grumman. The rocket was booster B1103, on its sixth flight. A retry was set for 1:17am PDT on Tuesday 6 October (4:17am EDT), and we have not confirmed the outcome as of writing.
Where this fits
The satellites belong to the Proliferated Warfighter Space Architecture, a set of interconnected satellites with roles from missile tracking to navigation. Tranche 1 will total 154 operational satellites: 126 for the transport layer, 28 for tracking and 4 missile defence demonstrators.
T1TL-A would be the fourth transport layer launch, after T1TL-B in September 2025, T1TL-C a month later and T1TL-E on 16 July 2026. As of the July launch, only York Space Systems had flown satellites in the series, and none of Northrop Grumman's had launched. The programme has run late before: the first satellites were meant to be ready for launch by September 2024 and flew a year after that.
What to watch
A scrub in the last minute of the count is usually a protective abort, not a sign of a design fault, but SpaceX has not said which it was. The next thing to check is whether the retry flew on 6 October and whether the Northrop Grumman satellites reach orbit cleanly. The same week, SpaceX also launched the Falcon Heavy NROL-97 mission and Crew-13.
