NROL-52 – Atlas V 421 (AV-075) – Канаверал SLC-41 – 15.10.2017 07:28 UTC

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 4 мин. назад

Continuing to watch the weather as we maintain the hold in the #AtlasV #NROL52 countdown.

[tnt22]

10/05/2017 09:02

The hold is being extended by another five minutes while the launch team watches the weather. The winds have eased dramatically after the rain moved on through the area.

[tnt22]

Updated: 10/05/2017 09:10

Five more minutes have been added to this continuing hold, putting the fueling readiness poll at 2:09 a.m. and resumption no sooner than 2:11 a.m.

10/05/2017 09:10

Five more minutes have been added to this continuing hold.

[tnt22]

10/05/2017 09:14

The launch team is posturing to resume operations after waiting for the winds to subside.

[tnt22]

10/05/2017 09:16 Countdown running again

T-minus 2 hours and counting! The launch countdown has resumed for today's flight of the Atlas 5 rocket to deploy the clandestine NROL-52 satellite for the National Reconnaissance Office.

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 20 сек. назад

Winds finally died down. Now prepping for cryo ops #NROL52

[tnt22]

10/05/2017 09:20

NEW TIME is being coordinated for 4:22 a.m. (0822 GMT) after high winds held up the start of fueling operations this morning.

[tnt22]

10/05/2017 09:21

MAN STATIONS for cryogenic tanking. A readiness poll will be conducted in five minutes.

[tnt22]

10/05/2017 09:23

The ULA launch conductor at the Atlas Spaceflight Operations Center is briefing his team on procedures before entering into the final two hours of the countdown.

[tnt22]

10/05/2017 09:24 GO for fueling

Console operators have reported READY status during the pre-fueling readiness poll. The ULA launch director also voiced his approval for moving forward with the countdown today.

The loading of nearly 66,000 gallons of cryogenic liquid oxygen and liquid hydrogen into the Atlas 5 rocket will be getting underway a short time from now.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 3 мин. назад

The team has give the go to begin cryogenic fueling operations. New launch time is 4:22amEDT. #AtlasV #NROL52

[tnt22]

10/05/2017 09:26

Clocks have one more built-in hold planned at T-minus 4 minutes. During that pause, the final "go" for launch will be given. Liftoff is targeted for 4:22 a.m. EDT (0822 GMT) from Cape Canaveral's Complex 41.

[tnt22]

10/05/2017 09:27

Chilldown thermal conditioning of the mobile launch platform upon which the rocket stands is beginning. This is meant to ease the shock on equipment when supercold cryogenic propellants start flowing into the rocket.

[tnt22]

10/05/2017 09:28

The Centaur liquid oxygen pad storage area has been prepped. The next step is conditioning the transfer lines, which is now beginning to prepare the plumbing for flowing the cryogenic oxidizer.

[tnt22]

10/05/2017 09:36 Centaur LOX loading

Filling of the Centaur upper stage with about 4,150 gallons of liquid oxygen has begun at Cape Canaveral's Complex 41 following the thermal conditioning of the transfer pipes.

The liquid oxygen -- chilled to Minus-298 degrees F -- will be consumed during the launch by the Centaur's single RL10 engine along with liquid hydrogen to be pumped into the stage a little later in the countdown. The Centaur will perform the firings required to propel the NROL-52 spacecraft into the desired orbit today.

[tnt22]

Spaceflight Now‏ @SpaceflightNow 3 мин. назад

Fueling of United Launch Alliance Atlas 5 rocket with 66,000 gallons of fuel and oxidizer underway to loft #NROL52 https://spaceflightnow.com/2017/10/02/av075_journal/ ...

[tnt22]

10/05/2017 09:42

Passing the 10 percent level on the Centaur upper stage's liquid oxygen tank.

[tnt22]

10/05/2017 09:45

The launch team is returning the vehicle to its precautionary high-wind pressurization mode due to the next rain cell about to move ashore with gusty conditions.

:evil:

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 2 мин. назад

Heads up! #AtlasV #NROL52 launch time is now 4:22amEDT. Broadcast will begin at 4:02amEDT. http://bit.ly/av_nrol52 

[tnt22]

10/05/2017 09:55

SCRUB! Extremely windy conditions associated with rain squalls coming off the Atlantic Ocean have forced officials to stand down with today's launch attempt.

After delaying the start of fueling to let the winds to die down after a band of showers pass, the launch team was able to resume the countdown and begin fueling operations. But shortly thereafter the weather officer advised that another rain cell packing high winds was headed toward the pad.

In the interest of safety, flow was stopped and the vehicle was returned to its high-wind pressurization mode.

Liftoff is tentatively reset for Friday morning, But there's just a 30 percent chance of acceptable weather as a tropical wave moves through the region.

:evil: