16 février 2023 | International, C4ISR
Space Command crafting requirements to improve satellite mobility
Lt. Gen. John Shaw says the need for mobility is driving the command to explore options for what he calls "dynamic space operations."
20 novembre 2019 | International, Aérospatial
B-21 Program Hits Schedule Pressure Even On ‘Conventional Trajectory’
As the first B-21 enters final assembly in Palmdale, California, the Northrop Grumman-led program is on track to hit a first-flight target in two years, although the first signs of schedule pressure have appeared.
Most of the details of the U.S. Air Force's newest stealth bomber remain a tightly guarded secret, but those facts released show the program is following a conventional trajectory despite being managed by an organization with the word “rapid” in its title.
The Air Force announced completion of the critical design review in December 2018 in the standard three years after Northrop Grumman won the engineering and manufacturing development contract. The target for the first flight milestone stayed secret until July , when Gen. Stephen Wilson, the Air Force's vice chief of staff, stated publicly—and with remarkable specificity—that the milestone was 863 days away. Wilson offered that timetable on July 25, suggesting the targeted date is around Dec. 3, 2021.
SCO leader says earliest flight would be in December 2021
Public rollout event expected in Palmdale, California
The final piece of the publicly acknowledged schedule is that the first B-21 entered the early stages of final assembly around September in Palmdale, presumably within Northrop's Site 4 manufacturing complex and perhaps inside Building 401 in the same assembly bay that once housed the B-2.
To hit Wilson's first-flight target, Northrop's staff must complete assembly of the first aircraft, stage a public rollout event and perform necessary ground testing within about two years.
But Wilson's first-flight target may already be under pressure. His description made the December 2021 date seem like a fixed schedule milestone typical of most major defense acquisition programs. Randall Walden, who leads the Rapid Capabilities Office assigned to lead the B-21 program, describes Wilson's timing as closer to a schedule goal than a deadline. Walden recast the target as the “earliest possible” date for first flight, which he has little confidence the program will achieve.
“I would not bet on that date,” Walden told an audience at a Capitol Hill Club breakfast on Oct. 24 organized by the Air Force Association.
The comment is a rare cautionary note among otherwise glowing descriptions of the B-21 program by officials cleared to know the status of the development program. In March 2018, Rep. Rob Wittman (R-Va.) reported concerns about the design of the engine inlet, citing an internal dispute between Northrop and engine supplier Pratt & Whitney's engineers. Twelve months later, Wittman confirmed that the inlet design problem had been resolved. The program has since received only glowing assessments by Air Force leaders, including a statement in October by Chief of Staff Gen. David Goldfein that the B-21 ranks at the top of his list of successful acquisition projects.
Despite those assurances, transitioning a new aircraft from a paper design into manufactured hardware is a challenging phase for any program. Large pieces of the first aircraft are now in assembly.
“We're working a production line, literally, today,” Walden says.
An official artist's rendering shows the B-21 shares the all-wing profile of the B-2, minus the latter's distinctive sawtooth trailing edge. The Air Force's acquisition strategy also focused on minimizing risk by relying as much as possible on available technology. But a modern bomber with the B-21's mission to penetrate into highly contested airspace is still anything but a simple project.
“It is a complex airplane. I'll leave it at that,” Walden says.
Walden expects the Air Force to stage a public rollout event in Palmdale when the aircraft is ready. For the B-2, the rollout was staged seven months before the first flight. If the B-21 stays to the same schedule, the unveiling could come as early as May 2020. But Walden adds that includes several big “ifs.”
“Like anything, building a complex system could add those schedule pressures,” Walden says. “We've got to bring parts together, got to assemble it and get it stuffed with the right avionics, get the landing gear on it, all the things that go along with an airplane.”
Any schedule pressure facing the B-21 would not surprise Frank Kendall, the former undersecretary of defense for acquisition, technology and logistics. Kendall led the shaping of the acquisition strategy for the B-21. In a recent interview, he recalled pushing back against attempts by the Air Force to award a firm, fixed-price contract instead of a more flexible cost-plus arrangement, which is generally applied to acquisition projects with a higher risk.
“When I looked at . . . the actual content of the program, I [was] so glad I told [the Air Force to use cost-plus],” Kendall says. “It's not risk-free. I'll be amazed if they get this thing in on schedule and on cost. But it was designed to have a reasonable chance of success.”
An independent estimate by the Defense Department assessed the cost of the engineering and manufacturing development phase at $21.4 billion, with follow-on production of at least 80-100 bombers worth up to $60 billion more. The Air Force has budgeted $5.9 billion over the next five years to pay for the first operational aircraft, with low-rate initial production possibly beginning in fiscal 2023.
“There are a lot of things that have to happen between now and a couple of years,” Walden says.
https://aviationweek.com/defense/b-21-program-hits-schedule-pressure-even-conventional-trajectory
Sur le même sujet
-
-
4 juin 2024 | International, C4ISR
SCD Unveils Mini Blackbird 1280 HFM, Redefining Infrared Detection with Extended Operational Duration
he Mini Blackbird 1280 HFM integrates the advantages of both SCD’s cooled and uncooled detectors, resulting in the creation of a new Mid-Wave Infrared detector
-
9 juillet 2020 | International, Aérospatial, Naval, Terrestre, C4ISR, Sécurité
Top Defense Execs Ask For Help in Next COVID Stimulus Package
The biggest defense manufacturers in the world warned the Pentagon and OMB of "significant job losses in pivotal states" if Congress doesn't come up with stimulus money to cover unforeseen expenses. By PAUL MCLEARYon July 08, 2020 at 4:16 PM WASHINGTON: A group of CEOs leading the world's top defense firms sent letters to Pentagon acquisition chief Ellen Lord and and Office of Management and Budget director Russell Vought on Wednesday, citing “significant job losses in pivotal states” if the federal government doesn't step in to assist with COVID-related costs. Electoral maps have traditionally acted as a tried and tested tool defense contractors use when making pitches to both the Pentagon and Congress, as a way of showing where the jobs sit in different congressional districts. The letter to Lord was signed by the leaders of Lockheed Martin, General Dynamics, Boeing, Raytheon, and BAE Systems, which represent five of the top seven defense companies in the world. Huntington Ingalls, Textron Inc., and L3Harris Technologies also signed onto the letter, which was obtained by Breaking Defense, requesting the Pentagon's help in pressing for stimulus money in the Senate's next rescue package. The Senate is slated to debate in the coming days. Lord has previously estimated the Pentagon would have to pay more than “lower double digit billions” to offset costs borne by defense manufacturers in lost work hours, buying PPE equipment and propping up smaller suppliers. Speaking to reporters at the Pentagon last month, Lord said she's seeing a “three-month slowdown to all programs due to COVID-19,” after the virus shut down defense manufacturing facilities and production lines across the globe. The vast majority of defense firms have operated at reduced capacity over the past several months, and Lord said the Pentagon continues to see the biggest impacts in the aviation and shipbuilding supply chains. The CEOs write that US-based supply chains “are simply not able to absorb these significant costs. Without additional funding in the next stimulus package, the resolution of [reimbursement] claims will need to be funded from existing DoD budget topline resources for FY20-22.” That would cause “significant reductions” in research and procurement budgets, they said, before pivoting to warning about Defense Secretary Mark Esper's top priority: modernizing weapons systems to keep abreast of China and Russia. Placing the burden on the companies to use their own case to meet unplanned emergency costs risks “thwarting the Department's ability to meet the challenges and threats associated with great power competition” they add. In order to keep the smaller suppliers afloat, companies have pushed contracts forward to give the smaller supplier more work, and in turn, DoD has sped up planned payments to the defense industry, hitting the $2 billion mark in recent weeks. Speaking at a Brookings Institution event this morning, Lord didn't mention the letter, but talked about moving more production of defense equipment to the United States from overseas. Part of that effort stems from President Trump's “American First” push to build up the domestic manufacturing sector, but Chinese influence in electronic supply chains is also a big concern. During a visit to the Fincantieri Marinette Marine shipyard in Wisconsin late last month, Trump said “we'll always live by two simple rules: Buy American and hire American.” Lord phrased the idea differently, saying she prefers to have two sources for equipment, and “we would like one of those, if possible, to be domestic.” That issue has been highlighted in the global pandemic shutdown which wreaked havoc on global supply chains. “We just found that particularly with microelectronics, we have gotten ourselves into a potentially compromised position,” Lord said. “Where we have US intellectual property going offshore for fabrication and packaging leaves us with some vulnerability there. That is unacceptable moving forward.” During his Wisconsin visit, Trump suggested that one of the considerations for awarding a $795 million contract to the US home of the Italian shipbuilder was its location in a competitive state in the 2020 presidential election. “You notice that's not a supply chain going through China and going through other countries,” he said, adding, “I hear the maneuverability is one of the big factors that you were chosen for the contract. The other is your location in Wisconsin, if you want to know the truth.” https://breakingdefense.com/2020/07/top-defense-execs-ask-for-help-in-next-covid-stimulus-package