JWST passed its final vibration testing Tuesday ensuring that the craft is finally fit for spaceflight. NASA has scheduled the telescope for an October 2018 launch, but the telescope was originally supposed to be launched in 2011 marking a long history of major cost overruns and delays.
NASA announced last December that the JWST was halfway completed, but the project is currently $7.2 billion over its initial budget and seven years behind the original schedule. The JWST was initially projected to cost $1.6 billion. The Government Accountability Office (GAO) now estimates the final cost of the telescope at $8.8 billion.
[...] During vibration testing in December at NASA's Goddard Spaceflight Center, accelerometers attached to the telescope detected "unexpected responses" and engineers were forced to shut the test down to protect the hardware. The kind of response NASA found could potentially create serious problems when the telescope is launched into space.
In a presentation at a meeting of the National Academies' Space Studies Board here May 3, Greg Robinson, the JWST program director at NASA Headquarters, said some "screws and washers" appear to have come off the spacecraft during recent environmental testing at a Northrop Grumman facility in Southern California. Technicians found the items after the spacecraft element of JWST, which includes the bus and sunshield but not its optics and instruments, was moved last weekend from one chamber for acoustics tests to another to prepare for vibration testing.
"Right now we believe that all of this hardware — we're talking screws and washers here — come from the sunshield cover," he said. "We're looking at what this really means and what is the recovery plan." The problem, he said, was only a couple of days old, and he had few additional details about the problem. "It's not terrible news, but it's not good news, either," he said. The incident, Robinson argued, showed the importance of the wide range of tests the spacecraft is put through prior to launch. "That's why we do the testing," he said. "We do it now, we find it now, we fix it and we launch a good spacecraft."
This latest incident comes as an independent review board, chartered by NASA in late March after announcing a one-year delay in JWST's launch because of other technical issues, is in the midst of its analysis of the mission and its launch readiness. That review, led by retired aerospace executive and former NASA Goddard director Tom Young, is scheduled to be completed at the end of the month.
NASA is expected to brief Congress on the status of the James Webb Space Telescope in late June.
Also at Popular Mechanics.
Previously: James Webb Space Telescope Vibration Testing Completed
Launch of James Webb Space Telescope Delayed to Spring 2019
JWST: Too Big to Fail?
GAO: James Webb Space Telescope Launch Date Likely Will be Delayed (Again)
Launch of James Webb Space Telescope Delayed to May 2020, Could Exceed Budget Cap
NASA Announces JWST Independent Review Board Members
A government watchdog is warning that the launch of the James Webb Space Telescope (JWST), the long-awaited successor to the Hubble that's been beset by schedule snafus and cost overruns, might face further delays. NASA announced in September it had pushed back the launch date of the JWST from late 2018 to some time in the spring of 2019 due to testing delays partly blamed on Hurricane Harvey's impact on Texas' Gulf Coast in August.
On Wednesday, lawmakers on the House Science, Space and Technology Committee were told it could take even longer to launch the world's most powerful telescope. "More delays are possible given the risks associated with the work ahead and the level of schedule reserves that are now (below) what's recommended," said Cristina Chaplain, director of Acquisition and Sourcing Management for the Government Accountability Office.
[...] Thomas Zurbuchen, NASA's associate administrator for science missions, told lawmakers he expects the space agency will be able to meet the spring 2019 schedule. "I believe it's achievable," he said.
The U.S. Government Acountability [sic] Office (GAO) has warned that the launch of James Webb Space Telescope (JWST) is likely to be delayed again, which could cause the budget cap set by the U.S. Congress to be exceeded:
The U.S. Government Acountability [sic] Office (GAO), a non-partisan group that investigates federal spending and performance, has issued a report on the James Webb Space Telescope that has astronomers worried. "It's likely the launch date will be delayed again," the report concludes — an ominous statement, given that any further delays could risk project cancellation.
Last year NASA announced a delay in the telescope's launch to sometime between March and June 2019. The 5- to 8-month delay came from problems integrating spacecraft components, especially its complex, five-layered sunshield, which must unfold perfectly when the telescope is deployed. Right after requesting the change in launch readiness date, the mission learned of further delays from its contractor, Northrum Grumman, due to "lessons learned from conducting deployment exercises of the spacecraft element and sunshield."
The mission now has 1.5 months of schedule reserve remaining, the GAO finds. Delays during integration and testing are common, "the phase in development where problems are most likely to be found and schedules tend to slip." The project has a total of five phases of integration and testing, and has made significant progress on phases three and four, with the fifth phase beginning in July.
Also at Science Magazine.
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