This story was originally published by NASA and is unaltered.

(C) NASA
This story was originally published by NASA and is unaltered.
. . . . . . . . . .

Launch Managers Give “Go” to Proceed with Terminal Count, Launch Set for 1:47 a.m. – Artemis [1]

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Date: 2022-11-16

The mission management team has polled “go” to proceed with the terminal count sequence. The launch director is also “go” and teams have set a new target launch time of 1:47 a.m. EST and the countdown clock resumed at 1:37 a.m.

With approval from the launch director and managers, a series of countdown milestones for the Artemis I terminal count to launch will be initiated by the Ground Launch Sequencer at T-10 minutes:

Ground Launch Sequencer (GLS) initiates terminal count (T-10M)

GLS go for core stage tank pressurization (T-6M)

Orion ascent pyros are armed (T-6M)

Orion set to internal power (T-6M)

Core Stage LH2 terminate replenish (T-5M57S)

GLS is go for flight termination system (FTS) arm (T-5M)

GLS is go for LH2 high flow bleed check (T-4M40S)

GLS is go for core stage auxiliary power unit (APU) start (T-4M)

Core Stage auxiliary power unit starts (T-4M)

Core stage L0X terminate replenish (T-4M)

ICPS LOX terminate replenish (T-3M30S)

GLS is go for purge sequence 4 (T-3M10S)

ICPS switches to internal battery power (T-1M56S)

Core stage switches to internal power (T-1M30S)

ICPS enters terminal countdown mode (T-1M20S)

ICPS LH2 terminate replenish (T-50S)

GLS sends “Go for automated launch sequencer” command (T-33S)

Core stage flight computer to automated launching sequencer (T-30S)

Hydrogen burn off igniters initiated (T-12S)

GLS sends the command for core stage engine start (T-10S)

RS-25 engines startup (T-6.36S)

Liftoff (T-0)

Solid rocket booster separation (Mission Elapsed Time 00:02:12)

Service module fairing jettison (MET 00:03:11)

Launch abort system jettison (MET 00:03:16)

Core stage main engine cutoff commanded (MET 00:08:03)

Core stage/ICPS separation (MET 00:08:15)

Orion solar array wing deploy begins (MET 00:18:09) – approx. 12 min duration

Perigee raise maneuver (MET 00:52:56)

Trans-lunar injection (MET 01:29:27)

Orion/ICPS separation (MET 01:57:36)

The timing of events after liftoff may vary by a few seconds.

[END]
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[1] Url: https://blogs.nasa.gov/artemis/2022/11/16/launch-managers-give-go-to-proceed-with-terminal-count-launch-set-for-147-a-m/

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