SDA Tranche 1 Transport Layer A
Falcon 9 Block 5. Space Launch Complex 4E, Vandenberg SFB, CA, USA.
Launch Successful
- Recovery
- B1103: Return to Launch Site, Landing Zone 4, successful
1 Landed
- Your Time
- UTC
- At the Pad
SDA Tranche 1 Transport Layer A
SpaceX
Mission
Government/Top Secret, Polar Orbit
Tranche 1 Transport Layer A is one of six missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Space Architecture (PWSA) Tranche 1 Transport Layer constellation, which will provide assured, resilient, low-latency military data and connectivity worldwide to the full range of warfighter platforms from Low Earth Orbit satellites. The constellation will be interconnected with Optical Inter-Satellite Links (OISLs) which have significantly increased performance over existing radio frequency crosslinks. It is expected to operate over Ka band, have stereo coverage and be dynamically networked for simpler hand-offs, greater bandwidth and fault tolerance. This launch carries 21 satellites manufactured by Northrop Grumman.
Countdown Sequence
Planned offsets from T-0; confirmations link to their sources
Sequence Ended · Success
- T−00:38:00
GO for Prop Load
Launch director verifies go for propellant load
Planned Time Elapsed
- T−00:35:00
Prop Load
Start of propelland loading
Planned Time Elapsed
- T−00:35:00
Stage 1 LOX Load
Start of liquid oxygen loading in the first stage
Planned Time Elapsed
- T−00:16:00
Stage 2 LOX Load
Start of liquid oxygen loading in the second stage
Planned Time Elapsed
- T−00:07:00
Engine Chill
Start of engine chilling
Planned Time Elapsed
- T−00:01:00
Startup
The onboard computer takes control over the countdown and runs last checks
Planned Time Elapsed
- T−00:01:00
Tank Press
Fuel tanks are pressurized to flight levels
Planned Time Elapsed
- T−00:00:45
GO for Launch
Launch director verifies go for launch
Planned Time Elapsed
- T−00:00:03
Ignition
Start of the engine ignition sequence
Planned Time Elapsed
- T+00:00:00
- T+00:01:04
Max-Q
Maximum dynamic pressure
Planned Time Elapsed
- T+00:02:14
MECO
Cut-off of the main engine
Planned Time Elapsed
- T+00:02:18
Stage 2 Separation
Separation of the second stage from the first
Planned Time Elapsed
- T+00:02:25
SES-1
First start of the second engine
Planned Time Elapsed
- T+00:02:31
Booster Boostback Burn Startup
Start of the booster boostback burn
Planned Time Elapsed
- T+00:03:04
Fairing Separation
Separation of the payload fairing
Planned Time Elapsed
- T+00:03:24
Booster Boostback Burn Shutdown
End of the booster boostback burn
Planned Time Elapsed
- T+00:06:09
Entry Burn Startup
Start of the atmospheric entry burn
Planned Time Elapsed
- T+00:06:21
Entry Burn Shutdown
End of the atmospheric entry burn
Planned Time Elapsed
- T+00:07:15
Stage 1 Landing Burn
Start of the first stage landing burn
Planned Time Elapsed
- T+00:07:19
Stage 1 Landing
Landing of the first stage
Planned Time Elapsed
Schedule History
Every T-0 since tracking began, as precisely as it was known
- First Seen
Slip +23h 42m
Slip +23h 53m
Slip +10m
Slip +44sCurrent
Change Log
Detected changes and source updates
Launch success.
StatusIn Flight → Success
WebcastWebcast ended
RecoveryB1103: Return to Launch Site, Landing Zone 4, successfulLanding successful
Liftoff!
StatusGo → In Flight
Unofficial Re-stream by SPACE AFFAIRS has started
WebcastWebcast is live
Tweaked T-0.
PrecisionTiming now known to the second
Slip +44sNow targeting
Tweaked T-0.
Slip +10mNow targeting
Delayed to NET October 10.
Slip +23h 53mNow targeting
Delayed to NET October 9.
Slip +23h 42mNow targeting
Delayed to NET October 8.
Confirmed rescheduled for October 6.
Scrubbed for the day.
Hold at T-00:58.
Now targeting Oct 05 at 08:18 UTC
Now targeting Oct 05 at 08:17 UTC
GO for launch.
NET October 5 per marine navigation warnings, TBC.
NET October.
NET September.
NET mid-February.
Delayed to NET early 2026.
NET March 2025.
NET late 2024.
Adding launch