WGS-10 - Delta IV-M+(5,4) [D-383] - CCAFS, SLC-37 - 16.03.2019, 00:26 UTC

Автор tnt22, 02.01.2019 23:02:52

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tnt22

ЦитироватьMar 15, 2019 18:44

The flight control operational test is beginning for the Delta IV rocket. This test is known as flight slews, which will perform gimbal checks of the rocket engine nozzles on the vehicle, in a state prior to cryogenic fueling.

tnt22

ЦитироватьMar 15, 2019 19:04

MST rolled back

The Mobile Service Tower at Space Launch Complex-37 has been retracted and secured in the launch position, revealing the United Launch Alliance Delta IV rocket for its flight to place the WGS-10 communications satellite into orbit for use by the U.S. warfighter.


Photo by ULA

The MST is a critical part of the launch complex, proving the primary access and weather protection to the rocket during its stay on the launch pad, and its overhead crane system serves a vital role in vertical integration of payloads onto the Delta IV rockets.

Rollback of the MST signals a major milestone at the start of launch day operations. Configuring launch pad systems and securing equipment will be completed over the next couple of hours before all personnel clear the site for fueling.

Activities remain on schedule for a liftoff at 6:56 p.m. EDT (2256 UTC).

tnt22

ЦитироватьMar 15, 2019 19:22

The flight control operational test has been completed successfully.

tnt22

ЦитироватьMar 15, 2019 20:44

Hold-fire checks are being conducted at this time. This verifies the circuitry used to stop the countdown if a safety concern arises.

tnt22

ЦитироватьMar 15, 2019 20:49

Guidance system testing is complete.

tnt22

ЦитироватьMar 15, 2019 20:51

The initiation of gaseous nitrogen flow to the payload fairing has started by the environmental control system console operator.

tnt22

ЦитироватьMar 15, 2019 20:55

Pre-fueling tests are underway to verify the proper functions of liquid oxygen and liquid hydrogen valves on all stages of the launch vehicle.

tnt22

ЦитироватьMar 15, 2019 21:01
Weather 80% GO

This is Delta Launch Control at T-minus 4 hours, 25 minutes (L-4 hours, 55 minutes) and counting. In the pre-fueling weather briefing, conditions at Cape Canaveral are acceptable for proceeding into cryogenic tanking operations at Space Launch Complex-37.

Launch Weather Officer Clay Flynn from the Air Force's 45th Weather Squadron also reports that the weather outlook remains favorable for the flight of Delta IV and WGS-10 this evening. The forecast calls for an 80 percent chance of allowable liftoff conditions, with just scattered clouds, good visibility, south-southeasterly winds peaking to 16 knots and a temperature of near 75 degrees F.

The only concern is cumulus clouds from any showers that develop.

All rules are green and "go" at the present time.

tnt22

ЦитироватьMar 15, 2019 21:05

The initiation of gaseous nitrogen flow to the launch vehicle is starting. This changes the environmental control systems to supply conditioned nitrogen gas rather than air to the internal compartments of the Delta IV rocket in preparation for the cryogenic fueling and in-flight environments.

The ECS changeover to the payload fairing occurred a short time ago.

tnt22

ЦитироватьMar 15, 2019 21:11
Countdown holding

This is Delta Launch Control at T-minus 4 hours, 15 minutes and holding. The countdown has entered the first of two planned, built-in holds that are scheduled in today's timeline. Each is 15-minute blocks of time that gives the countdown some margin to resolve issues or catch up on work could be running behind.

This particular hold serves as a margin before fueling operations begin. At the present time, however, all activities are on schedule and no significant problems are being addressed by the launch team.

The final hold occurs at T-minus 4 minutes.

tnt22

ЦитироватьMar 15, 2019 21:23

We will remain in this hold for an additional five to 10 minutes to finish the pre-flight checklist steps.

tnt22

ЦитироватьChris G - NSF‏ @ChrisG_NSF 3 мин. назад

They have not cleared the pad yet. We will NOT be launching at the opening of the window. Expecting a 10-15min delay. #DeltaIV #WGS10 @ulalaunch

tnt22


tnt22

ЦитироватьMar 15, 2019 21:45

Countdown resumes

This is Delta Launch Control at T-minus 4 hours, 15 minutes and counting. The next phase of today's launch countdown has been initiated for liftoff of the United Launch Alliance Delta IV rocket for the tonight's satellite-delivery flight of WGS-10.

Preparatory steps for fueling are being kicked off, including liquid hydrogen storage tank pressurization and charging the high-pressure helium bottles on the common booster core and second stage.

tnt22

ЦитироватьChris G - NSF‏ @ChrisG_NSF 3 мин. назад

Countdown has resumed later than expected. We will have a new target launch time soon. #DeltaIV #WGS10 @ulalaunch

tnt22

ЦитироватьMar 15, 2019 22:25

Antenna checks will be performed shortly to verify functionality of the GPS Metric Tracking system. GPS MT is the system that uses the overhead Global Positioning System navigation satellite constellation to track the rocket's flight downrange with position, velocity and timing information.

tnt22

ЦитироватьMar 15, 2019 22:35
CBC LH2 loading begins

This is Delta Launch Control at T-minus 3 hours, 20 minutes and counting. The cold gas chilldown conditioning of the common booster core's liquid hydrogen system has been accomplished, clearing the way to begin propellant loading in "slow-fill" mode. That will transition to "fast-fill" after a small portion of the tank is loaded.

tnt22

ЦитироватьMar 15, 2019 23:05
CBC LOX loading begins

This is Delta Launch Control at T-minus 2 hours, 55 minutes and counting. The liquid oxygen chilldown is complete for the booster core, allowing 40,000 gallons of super-cold LOX to begin transferring into the rocket for today's launch.

tnt22

ЦитироватьMar 15, 2019 23:24
DCSS LH2 loading begins

The next step in fuel operations is getting underway by loading 14,000 gallons of liquid hydrogen into the Delta Cryogenic Second Stage following completion of that system's chilldown.

The stage receives its fuel from the launch pad's middle swing arm that extends from the Fixed Umbilical Tower to the Delta IV rocket.

tnt22

ЦитироватьMar 15, 2019 23:35
DCSS LOX loading begins

Chilldown of the second stage liquid oxygen system is complete, and the vehicle is ready to begin receiving 6,000 gallons of LOX for launch. This is the last of the rocket's cryogenic tanks to be filled in today's countdown.