NROL-71 - Delta IV-H [D-382] - Vandenberg SLC-6 - 19.01.2019, 19:10 UTC

[tnt22]

8:15 p.m. PST (11:15 p.m. EST; 0415 UTC) -- Hold!

A hold was called approximately T-minus 7 seconds due to a problem detected by the Terminal Countdown Sequencer Rack.

[tnt22]

[tnt22]

12/09/2018 07:21 Stephen Clark

ULA's launch team reports the launch pad is in a normal condition after the abort in the final seconds of the countdown.

[tnt22]

12/09/2018 07:26 Stephen Clark

ULA's launch team is proceeding into operations to drain propellants from the rocket, meaning tonight's launch attempt is officially scrubbed, as expected after the dramatic abort in the final 10 seconds of the countdown.

[Lesobaza]

"В районе эпидемия - ящур!!"

Дельту Союз с Арианой покусали )))

[tnt22]

[Lesobaza]

А они оптимисты были ))))
Холд откатили на Т -4:00

Но, всё-таки прекратили трансляцию. (((( 

[tnt22]

William Harwood‏ @cbs_spacenews 20:29 - 8 дек. 2018 г.

D4/NROL71: To recap, the Delta 4 Heavy countdown aborted at the T-minus 7-second mark, right around the time the engine in the right-side Common Booster Core was to ignite, followed 2 seconds later by ignition of the engines in the center and port-side CBC


20:29 - 8 дек. 2018 г.

D4/NROL71: Hydrogen spark ignitors had fired per the normal timeline several seconds earlier, but the countdown did not proceed past the 7-second mark; it is not clear whether any of the engines actually started, or began the start sequence, before the abort was commanded


20:32 - 8 дек. 2018 г.

D4/NROL71: The rocket was quickly safed and engineers are starting to offload propellants; at this point, it's not known exactly what happened, what sort of inspections/repairs might be needed, if any, or when ULA might make another launch attempt

[tnt22]

Jack Beyer‏ @thejackbeyer 20:28 - 8 дек. 2018 г.

Thats a scrub. First ever ULA pad abort? Wow. This is what my streak shot was looking like before the dreaded hold call. #DeltaIVHeavy @NASASpaceflight

[tnt22]

12/09/2018 07:34 Stephen Clark

ULA's launch team is setting up for an extended post-scrub turnaround, meaning the Delta 4-Heavy rocket is likely to remain on the ground for at least a few days.

[tnt22]

Delta IV Heavy aborted launch with NROL-71

SciNews

Опубликовано: 8 дек. 2018 г.

(3:07)

[tnt22]

Запись трансляции ULA (если не уберут)

Live Launch Broadcast: Delta IV NROL-71

United Launch Alliance

Трансляция началась 66 минут назад

(49:55)

[tnt22]

https://tass.ru/kosmos/5890025

9 ДЕК, 07:47 Обновлено 07:50
В США отменили запуск ракеты Delta IV с разведывательным спутником

Дата нового старта пока не определена

НЬЮ-ЙОРК, 9 декабря. /ТАСС/. Американская компания United Launch Alliance (ULA) отложила в субботу запуск тяжелой ракеты-носителя Delta IV Heavy с секретным спутником Национального управления военно-космической разведки (НУВКР) США. Об этом сообщила ULA на своем сайте.

Пуск должен был состояться с базы ВВС США Ванденберг (штат Калифорния) в 20:15 по времени Западного побережья США (07:15 мск в воскресенье). "Сегодняшний запуск отменен, начинается откачка криогенного топлива из носителя. Дата нового старта пока не определена", - уточнила компания.

Спойлер

Запуск аппарата несколько раз переносился. В предыдущий раз это произошло в пятницу и было обусловлено возникновением "проблем с резервным каналом связи между центром управления и стартовой площадкой". Как информировала ULA, погодные условия в субботу на 70% благоприятствовали запуску.

Деятельность НУВКР, контролирующего разведывательные спутники США, строго засекречена. Официальной информации о предназначении спутника, который будет запущен на орбиту, и о его стоимости нет. Название аппарата также не приводится, официально миссия по выводу спутника на орбиту обозначена кодом NROL-71.

Delta IV Heavy является модифицированной тяжелой версией обычной ракеты-носителя Delta IV. Она оснащена двумя дополнительными ускорителями, которые крепятся по бокам к основному сегменту. Ракета способна выводить на геостационарную орбиту груз массой до 14,2 т, на низкую околоземную орбиту - до 28,8 т. Это должен был быть второй пуск Delta IV Heavy компанией United Launch Alliance за последние четыре месяца.

ULA была основана в 2006 году. Компания является совместным предприятием авиационных корпораций Boeing и Lockheed Martin.

[свернуть]

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 38 мин. назад

The launch of #DeltaIVHeavy carrying the #NROL71 mission for the @NatReconOfc was scrubbed today due to an unexpected condition during terminal count. The team is reviewing all data and will determine the path forward. A new launch date will be provided when available.

[tnt22]

12/09/2018 08:08 Stephen Clark

ULA's statement suggests the abort was triggered a half-second before the RS-68A engine on the starboard first stage core was supposed to ignite.

[tnt22]

12/09/2018 08:17 Stephen Clark

The sparklers at the base of the rocket -- called Radially Outward Firing Initiators -- were firing when the Delta 4 countdown was halted. The sparklers, or ROFIs, are used to burn off excess hydrogen before engine start to eliminate the risk of a large fireball or explosion.

One previous Delta 4 launch was aborted after the sparklers ignited. ULA had to push back that launch by three days to replace the ROFIs and resolve the problem that caused the abort. The Delta 4 rocket successfully lifted off three days later and carried the U.S. Air Force's GPS 2F-1 navigation satellite into orbit from Cape Canaveral.

[tnt22]

https://spaceflightnow.com/2018/12/09/delta-4-heavy-countdown-aborted-moments-before-launch/

Delta 4-Heavy countdown aborted moments before launch
December 9, 2018 | Stephen Clark

A dramatic automatic abort 7.5 seconds before the planned liftoff of a United Launch Alliance Delta 4-Heavy rocket Saturday night kept the towering launcher on the pad at Vandenberg Air Force Base, California, with a top secret spy payload for the National Reconnaissance Office.

The 233-foot-tall (71-meter) rocket was counting down to launch at 8:15 p.m. PST Saturday (11:15 p.m. PST; 0415 GMT Sunday), but an automated sequencer detected a technical issue and triggered an abort.

"Hold hold hold," a member of the ULA launch team declared on the countdown net.

A burst of flame appeared at the base of the rocket, a normal occurrence in the final seconds of a Delta 4 countdown as sparklers activate near the engines to burn off excess hydrogen gas before ignition, a measure aimed at eliminating the risk of a fireball or explosion.

It was not immediately clear whether any of the rocket's three Aerojet Rocketdyne RS-68A main engines started their ignition sequences, but a statement later released by ULA said the computer-controlled countdown sequencer ordered an abort at T-minus 7.5 seconds.

Спойлер

In the statement, ULA said the abort was "due to an unexpected condition during terminal count at approximately 7.5 seconds before liftoff.

"The team is currently reviewing all data and will determine the path forward. A new launch date will be provided when available," ULA said.

The Delta 4-Heavy is made up of three Delta 4 first stage boosters bolted together, each with an RS-68A engine burning liquid hydrogen and liquid oxygen propellants. ULA commands the three RS-68A engines to start in a staggered sequence, beginning with the starboard engine at T-minus 7 seconds, followed two seconds later by ignition of the center and port engines.

The timing of the abort at T-minus 7.5 seconds suggests the countdown stopped around a half-second before the first of the Delta 4-Heavy's three main engines was supposed to ignite.

ULA's launch team quickly "safed" the rocket, disarmed ordnance, and drained the Delta 4-Heavy of its supply of cryogenic propellants. The launch team did not set a new target launch date, but officials were instructed to plan for an extended turnaround after Saturday night's scrub, and the Delta 4-Heavy flight was expected to be delayed at least a few days.

A similar cutoff in the final seconds of a Delta 4 countdown in 2010 resulted in a three-day slip to resolve the problem responsible for the abort — and replace the hydrogen burn-off sparklers on the pad — before the rocket successfully launched from Cape Canaveral with a GPS navigation satellite.

The upcoming mission from Vandenberg, located around 140 miles (225 kilometers) northwest of Los Angeles, is codenamed NROL-71 by the National Reconnaissance Office, which owns the U.S. government's classified intelligence-gathering satellites. The NRO has not released any information about the spacecraft aboard the Delta 4-Heavy, but independent observers of NRO space launches believe the payload is heading for an unusual, high-inclination orbit, and is likely a new Keyhole-type high-resolution optical imaging satellite, with an Earth-pointing telescope capable of capturing extremely detailed imagery of sites around the world for review by government intelligence analysts.

The Delta 4-Heavy is ULA's biggest rocket, and can loft up to 51,950 pounds (23,560 kilograms) of payload mass to a 120-mile-high (200-kilometer) low Earth orbit inclined 90 degrees to the equator.

The heavy-lift variant of the Delta 4 rocket has launched 10 times to date. The NROL-71 mission will be the 11th flight of a Delta 4-Heavy, and the 38th mission overall for the Delta 4 family since November 2002. It will also be ULA's ninth and final launch of the year, following five Atlas 5 launches, a pair of Delta 4s, and the final liftoff of the company's now-retired Delta 2 rocket.

[свернуть]

[Старый]

Не летим... Будут снимать со стола?

[Чебурашка]

Лысый из ULA молчит в своем Твиттере.

А вообще, вы, господа, зажрались. Хотите аж две Дельты Хеви за год 
Потом вам ещё и по Ангаре каждый год подавай. 

[tnt22]

Rocket Talk: Delta IV Heavy Staggered Start

United Launch Alliance

Опубликовано: 8 дек. 2018 г.

If you've ever seen a Delta IV Heavy rocket lift off, you may have notice that it seems to emerge from a cloud of fire. ULA's Tyler Strickland talks with propulsion engineer Kris Kolman to learn more.

(2:53)