| L-8:00:00 |
Teams on Station |
| L-8:00:00 |
Call to Stations |
| L-8:00:00 |
Launch Window Determination |
| L-7:45:00 |
Begin Launch Checklist |
| L-7:30:00 |
Launch Team Voice Checks |
| L-7:00:00 |
CST Countdown Sequence (Combined Systems Test) |
| L-7:00:00 |
Range Safety Setup |
| L-6:30:00 |
Launch Pad Evacuation |
| L-6:05:00 |
Poll to Initiate Propellant Loading Sequencer |
| L-6:05:00 |
Start Warm Helium Flow |
| L-6:00:00 |
OCCS Sequencer Initiation |
| L-5:55:00 |
Start Launch Vehicle Activation |
| L-5:30:00 |
1st & 2nd Stage ECU Initialization |
| L-5:20:00 |
Initiate Helium Purge Flow |
| L-5:20:00 |
Hard Line Communications Checks |
| L-5:10:00 |
Space Integrated GPS/Inertial Navigation System Init |
| L-5:00:00 |
Launch Vehicle Activation Complete |
| L-5:00:00 |
Combined Systems Test |
| L-5:00:00 |
Open Loop C- and S-Band Testing |
| L-5:00:00 |
Telemetry Verification |
| L-5:00:00 |
Payload Checks |
| L-5:00:00 |
Mission Simulation Test |
| L-5:00:00 |
Red-Team Launch Pad Evacuation |
| L-4:45:00 |
Space Integrated GPS/Inertial Navigation System Align |
| L-4:00:00 |
Initiate Pre-Launch Processing |
| L-4:00:00 |
Start LOX Tank Purge |
| L-3:55:00 |
OCCS – Regulator Adjustment |
| L-3:40:00 |
Management Comm Checks, CDT Ops Pause |
| L-3:35:00 |
S- and C-Band Communications Checks complete |
| L-3:30:00 |
Management Call to Stations |
| L-3:15:00 |
LOX Ground Support Equipment Chilldown |
| L-3:05:00 |
Main Subcooler N2 Fill complete |
| L-3:00:00 |
Initiate Nitrogen Flow |
| L-3:00:00 |
Electrical Checks complete |
| L-2:45:00 |
FTS Open Loop Testing (Flight Termination System) |
| L-2:24:00 |
Enable Launch Vehicle Ordnances |
| L-2:00:00 |
Propellant Loading Operations |
| L-2:00:00 |
LOX Transfer Lines Chilldown |
| L-1:45:00 |
15-minute Ops Hold |
| L-1:30:00 |
LOX Tank Chilldown |
| L-1:30:00 |
LOX & RP-1 Loading of first Stage |
| L-1:30:00 |
Vehicle Tests |
| L-1:30:00 |
Range Verifications |
| L-0:45:00 |
Flight Sfotware Load |
| L-0:35:00 |
Rocket Cam Verification, Switch to chilled Helium |
| L-0:30:00 |
Launch Readiness Polls |
| L-0:25:00 |
AJ-26 Low Flow Chilldown |
| L-0:15:00 |
Propellants at Flight Level |
| L-0:12:00 |
GO/No GO for Launch Poll |
| L-0:10:00 |
AJ-26 Medium Flow Chilldown |
| L-0:05:00 |
Flight Termination System to Internal Power |
| L-0:05:00 |
Launch Vehicle to Internal Power |
| L-0:03:30 |
Initiate and Verify Countdown Auto Sequencer |
| T-0:03:00 |
Countdown Auto Sequence |
| T-0:02:45 |
Electrical System Verify, LOX Pre-Pressurization |
| T-0:02:35 |
SIGI Ready for Flight Verify |
| T-0:02:15 |
SIGI to Inertial Mode |
| T-0:02:00 |
Propellant Tank Pressurization |
| T-0:02:00 |
AJ-26 Nitrogen Purge |
| T-0:01:55 |
Main Engine Heater Deactivation |
| T-0:01:00 |
High-Speed Camera Start |
| T-0:00:15 |
Main Engine Slew Profile |
| T-0:00:05 |
TEL Retraction (Transporter, Erector & Launch Device) |
| T-0:00:01.5 |
Final Vehicle Health Check |
| T-0:00:00.5 |
Initiation of Launch Ordnance Train |
| T-0:00:00 |
AJ-26 Ignition |
| T-0:00:00 |
Throttle Up to 108% |
| T+0:00:01.5 |
AJ-26 Monitoring Complete |
| T+0:00:01.5 |
Launch Commit |
| T+0:00:01.5 |
Actuate LOX/RP-1 Propellant Line Pyros |
| T+0:00:01.5 |
Fire Hold Down Pyros |
| T+0:00:02 |
Liftoff |
