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Meridian Flight Ops
Pad 14C · Vessel “Longshore” · Flight LS-092
Time to launch
T−00:04:12:30.000
Window 04:12 → 06:40 UTCHold points 2Counting

Propulsion

CH-01
LOX tank pressure
3.42
RP-1 tank pressure
3.11
Chamber temp
288
Turbopump RPM
32 480
Helium reserve
61 %
Purge line
NOMINAL

Guidance

CH-02
IMU drift
0.014
GNSS lock
14 SV
Attitude error
0.06
Trajectory hash
7F·A2·C9
Abort corridor
CLEAR
Flight computer
TRIPLEX OK
FC-A96
FC-B93
FC-C71

Range & Weather

CH-03
Surface wind
11.4
Shear 3–8 km
MARGINAL
Cloud ceiling
4 200 ft
Field mill
0.9
Sea state
2.1 m
Downrange assets
3 / 3
  • 04:09Balloon sounding 4 released
  • 04:06Shear layer thinning at 5.2 km
  • 03:58Recovery vessel Kestrel on station
  • 03:51Range cleared of surface traffic

Console Loop

CH-04
  • 04:12FLIGHT: all stations, poll on my mark
  • 04:11PROP: tanking complete, topping
  • 04:10GNC: alignment converged
  • 04:08RANGE: field mill green
  • 04:05ECOM: link margin 9.4 dB
Loop latency
42
Stations keyed
11 / 12
Recorder
ARMED

Launch readiness poll

Twelve stations report to Flight. A single NO-GO stops the count at the next hold point; a HOLD may be cleared by the responsible discipline before T−00:10:00.

Poll 3 of 4 · recorded 04:12:44 UTC · Flight Director M. Oyelaran
Station Call Constraint Margin Last update
PROP PropulsionGOTank press ≥ 3.05 bar+0.3704:11:52
GNC Guidance & ControlGOIMU drift ≤ 0.020+0.00604:10:31
ECOM Electrical & CommsGOLink margin ≥ 6 dB+3.404:05:09
WX WeatherHOLDShear < 0.006 s⁻¹−0.00104:06:14
RANGE Range SafetyGOCorridor clear—03:51:40
RCVY RecoveryGOSea state ≤ 3.0 m+0.903:58:22
THRM ThermalGOSkin ΔT ≤ 12 K+5.104:09:03
GSE Ground SupportNO-GOUmbilical retract ≤ 1.4 s−0.304:12:01
PAYL PayloadGOBattery ≥ 88 %+404:02:47
FSW Flight SoftwareGOBuild 4.19.2 verified—01:20:00
MED Pad MedicalGOCrew on station—03:40:15
PA Public AffairsGOFeed uplink live—04:00:00
10 GO · 1 HOLD · 1 NO-GO

GSE reports umbilical retract 0.3 s over spec. Flight has called a built-in hold at T−00:10:00 pending a second actuation test.

Terminal count

  1. Crew ingress complete
  2. Built-in hold
  3. Final poll
  4. Autosequence start
  5. Go for launch
  6. Ignition

Terminal count events

Each event carries an owner, an abort criterion and a recycle path. Nothing on this list is advisory.

T−00:45:00 · PAD

Crew ingress complete, hatch closed for flight

White room team clears the tower. Cabin leak check runs for nine minutes against a 0.02 psi/min criterion. A failed check recycles to T−01:10:00 with a 42-minute window remaining.

Pad LeadRecycle 25 min
T−00:20:00 · FLIGHT

Built-in hold, twenty minutes

Clock stops. Weather takes a fresh sounding, GSE reruns the umbilical actuation, and the flight director reconciles any open constraint. This hold absorbs schedule risk without costing window.

Hold 20 minExtendable ×2
T−00:10:00 · FLIGHT

Final go / no-go poll

All twelve stations report on the loop in fixed order. Flight calls the count. From this point the vehicle transitions to internal power and the ground crew has no path back to the pad.

12 stationsVoice recorded
T−00:04:00 · FSW

Autosequence start

Ground control hands the count to the vehicle. Human intervention is reduced to a single abort command. Tank pressurisation ramps to flight levels and the flight termination system arms.

Vehicle-ownedAbort only
T−00:00:45 · FLIGHT

Go for launch

Final verbal release. Strongback retracts to sixty degrees, water deluge floods the flame trench, and the pad transitions to unattended state.

Deluge onPad unattended
T−00:00:03 · VEHICLE

Ignition sequence and thrust build

Nine engines light in a staggered 300 ms pattern. The vehicle holds down until all chambers report above 92 % of rated thrust; anything short triggers a pad-safe shutdown before release.

92 % gateHolddown

Request a loop credential

Observer credentials grant read-only access to the Meridian flight loop and the archived telemetry wall for LS-092. Credentials expire ninety minutes after landing.

Requests are reviewed by Range Security. Median turnaround 6 hours.

Loop transcript, last hour

  • FLIGHTAll stations, this is Flight. Poll three complete. GSE is no-go, weather is hold. We will take the built-in hold at T minus ten.
  • GSEFlight, GSE. Retract came in at one point seven. We want a second actuation before we call go.
  • WXFlight, weather. Shear layer is thinning but still marginal. Ask for one more sounding.
  • RCVYKestrel is on station, sea state two point one, we are go.
  • RANGESurface traffic is clear, corridor is clean out to two hundred nautical miles.