Recorded mission
Watch
SpaceX
Falcon 9 Block 5 | SDA Tranche 1 Transport Layer B
Recorded mission coverage
Playing a video connects to YouTube. Coverage may be scheduled, live or recorded. If a player is unavailable, use “Open source”.
Mission brief
The flight at a glance.
Tranche 1 Transport Layer B 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 York Space Systems.
Open the full mission →Published flight sequence
Know what comes next.
Planned timings relative to the target. These steps do not indicate live progress.
- T−00:38:00
GO for Prop Load
- T−00:35:00
Stage 1 LOX Load
- T−00:35:00
Prop Load
- T−00:16:00
Stage 2 LOX Load
- T−00:07:00
Engine Chill
- T−00:01:00
Tank Press
See all 21 published steps ↓
- T−00:01:00
Startup
- T−00:00:45
GO for Launch
- T−00:00:03
Ignition
- T+00:00:00
Liftoff
- T+00:01:12
Max-Q
- T+00:02:30
MECO
- T+00:02:34
Stage 2 Separation
- T+00:02:42
SES-1
- T+00:06:24
Entry Burn Startup
- T+00:06:47
Entry Burn Shutdown
- T+00:08:12
Stage 1 Landing Burn
- T+00:08:36
Stage 1 Landing
- T+00:08:38
SECO-1
- T+00:56:43
SES-2
- T+00:56:51
SECO-2