ULA Delta IV Heavy NROL-71 Launch Date Under Review

Parker Solar Probe will launch on a United Launch Alliance Delta IV Heavy from Cape Canaveral Air Force Station in Florida. (Credit: NASA/Johns Hopkins APL/Ed Whitman)

VANDENBERG AIR FORCE BASE, Calif. Jan. 5, 2019 (ULA PR) – The United Launch Alliance Delta IV Heavy carrying the NROL-71 mission launch date is under review. A new launch date and time will be provided pending the results of additional testing.

“We continue to remedy the technical issues that caused the last scrub of the Delta IV Heavy, and are working with our partners, the National Reconnaissance Office and the U.S. Air Force, to ensure that we fly when it is safe to do so,” said Gary Wentz, vice president of Government and Commercial programs, “we understand that this is a high-priority mission for the nation’s warfighters and we take our commitment to safety and mission assurance seriously.”

  • Ignacio Rockwill

    Can the Delta IV’s only be tanked/detanked a finite number of cycles? I think I recall hearing that but might be making it up.

  • Mr Snarky Answer

    This is typical of LH systems such as Shuttle ET.

  • Ignacio Rockwill

    Do you know how many times you can fill/refill Delta IV?

  • Mr Snarky Answer

    I don’t. I also don’t see any obvious references below but it you read cover to cover let me know.

    https://www.ulalaunch.com/docs/default-source/rockets/delta-iv-user's-guide.pdf