AEHF-4 - Atlas V 551 (AV-073) - CCAFS SLC-41 - 17.10.2018, 04:15 UTC

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11:56 p.m. EDT (0356 UTC) -- Countdown holding

T-minus 4 minutes and holding. The countdown has entered the planned 15-minute built-in hold designed to give a bit of margin to deal with any problems. Also during this time, the final readiness polls of the launch team and management members will be performed.

We remain on schedule for a liftoff at 12:15 a.m. EDT (0415 UTC) from Space Launch Complex 41 at Cape Canaveral.

In the countdown, we have completed the fuel fill sequence to ready the first stage main propulsion system for launch. And all three cryogenic tanks on the rocket have been topped off to flight level.

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12:09 a.m. EDT (0409 UTC) -- GO for launch!

The ULA Launch Director Bill Cullen and Air Force Mission Director Michael Dolan have given their respective final approvals to resume the countdown for flight of Atlas V to deliver AEHF-4 into space. Their concurrence was made following the readiness poll of the launch team by Launch Conductor Ed Kitta that verified all systems are "go" for launch.

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Зажигание!

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Пуск!

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