Northrop Grumman B-2 Spirit

{| today), which includes spare parts, equipment, retrofitting, and software support. B-2s were also used during the 2011 Libyan uprising.

The bomber has a crew of two and can drop up to 80 -class JDAM GPS-guided bombs, or 16 B83 nuclear bombs in a single pass through extremely dense anti-aircraft defenses. The B-2 is the only aircraft that can carry large air to surface standoff weapons in a stealth configuration. The program has been the subject of espionage and counter-espionage activity and the B-2 has provided prominent public spectacles at air shows since the 1990s.

Development

ATB project

The B-2 Spirit originated from the Advanced Technology Bomber (ATB) black project that began in 1979. The Cold War was long underway, and on the campaign trail in 1979 and 1980, presidential candidate Ronald Reagan promised to restore American military strength. On 22 August 1980, the incumbent Carter administration publicly disclosed that the United States Department of Defense (DoD) was working to develop stealth aircraft including the ATB. It was later revealed publicly in 2007 that MIT scientists helped assess the mission effectiveness of the aircraft under a classified contract during the 1980s.

After the evaluations of the companies' proposals, the ATB competition was reduced to the Northrop/Boeing and Lockheed/Rockwell teams with each receiving a study contract for further work. The Northrop design was larger while the Lockheed design included a small tail. The black project was funded under the code name "Aurora".

The Northrop design received the designation B-2 and the name "Spirit". The bomber's design was changed in the mid-1980s when the mission profile was changed from high-altitude to low-altitude, terrain-following. The redesign delayed the B-2's first flight by two years and added about US$1 billion to the program's cost. At the program's peak, approximately 13,000 people were employed at a dedicated plant in Pico Rivera, California for the aircraft's engineering and portions of its manufacturing.

The B-2 was first publicly displayed on 22 November 1988, at Air Force Plant 42, Palmdale, California, where it was assembled. This initial viewing was heavily guarded and guests were not allowed to see the rear of the B-2. However, Aviation Week editors found that there was no ban on overflying the airfield apron/presentation area and, to the chagrin of the USAF, took pictures from above of the aircraft's then-secret planform and suppressed engine exhausts. The B-2's first public flight was on 17 July 1989 from Palmdale.

Procurement

A procurement of 132 aircraft was planned in the mid-1980s, but was later reduced to 75. By the early 1990s, the Soviet Union had disintegrated, which effectively eliminated the Spirit's primary Cold War mission. Under budgetary pressures and congressional opposition, in his 1992 State of the Union Address, President George H.W. Bush announced B-2 production would be limited to 20 aircraft. In 1996, however, the Clinton administration, though originally committed to ending production of the bombers at 20 aircraft, authorized the conversion of a 21st bomber, a prototype test model, to Block 30 fully operational status at a cost of nearly $500 million.

In 1995, Northrop made a proposal to the USAF to build 20 additional aircraft with a flyaway cost of $566 million each.

Espionage

In 1984 a Northrop employee, Thomas Cavanaugh, was arrested for attempting to sell classified information to the Soviet Union, which apparently was smuggled out of the Pico Rivera, California factory. Cavanaugh was eventually sentenced to life in prison and released under parole in 2001.

Noshir Gowadia, a design engineer who worked on the B-2's propulsion system, was arrested in October 2005 for selling B-2 related classified information to foreign countries. His trial was initially scheduled for 12 February 2008, but he received a continuance. On 9 August 2010, Gowadia was convicted in the United States District Court for the District of Hawaii on 14 of 17 charges against him. Sentencing had been set for 22 November 2010. On 24 Jan 2011, Gowadia was sentenced to 32 years in prison.

Program costs

near Point Mugu, California, a B-2 drops forty-seven class Mark 82 bombs, which is more than half of a B-2's total ordnance payload]]

The program was the subject of public controversy for its costs to American taxpayers. In 1996 the General Accounting Office disclosed that the USAF's B-2 bombers "will be, by far, the most costly bombers to operate on a per aircraft basis", costing over three times as much as the B-1B (US$9.6 million annually) and over four times as much as the B-52H ($US6.8 million annually). In September 1997, each hour of B-2 flight necessitated 119 hours of maintenance in turn. Comparable maintenance needs for the B-52 and the B-1B are 53 and 60 hours respectively for each hour of flight. A key reason for this cost is the provision of air-conditioned hangars large enough for the bomber's 172 ft (52.4 m) wingspan, which are needed to maintain the aircraft's stealthy properties, especially its "low-observable" stealthy skins. Maintenance costs are about $3.4 million a month for each aircraft.

The total "military construction" cost related to the program was projected to be US$553.6 million in 1997 dollars. The cost to procure each B-2 was US$737 million in 1997 dollars, based only on a fleet cost of US$15.48 billion.

The growing cost of the B-2 program, and evidence of flaws in the aircraft's ability to elude detection by radar,

In 1990, the Department of Defense accused Northrop of using faulty components in the flight control system. Efforts have also been made to reduce the probability of bird ingestion, which could damage engine fan blades.

In time, a number of prominent members of Congress began to oppose the program's expansion, including former Democratic presidential nominee John Kerry, who cast votes against the B-2 in 1989, 1991 and 1992 while a US Senator representing Massachusetts. By 1992, Republican President George H.W. Bush called for the cancellation of the B-2 and promised to cut military spending by 30% in the wake of the collapse of the Soviet Union.

In May 1995, on the basis of its 1995 Heavy Bomber Force Study, the DOD determined that additional B-2 procurements would exacerbate efforts to develop and implement long term recapitalization plans for the USAF bomber force.

In October 1995, former Chief of Staff of the United States Air Force, General Mike Ryan, and Former Chairman of the Joint Chiefs of Staff, General John Shalikashvili, strongly recommended against Congressional action to fund the purchase of any additional B-2s, arguing that to do so would require unacceptable cuts in existing conventional and nuclear-capable aircraft to pay for the new bombers, and because the military had much higher priorities on which to spend its limited procurement dollars.

Some B-2 advocates argued that procuring twenty additional aircraft would save money because B-2s would be able to deeply penetrate anti-aircraft defenses and use low-cost, short-range attack weapons rather than expensive standoff weapons. However, in 1995, the Congressional Budget Office (CBO), and its Director of National Security Analysis, found that additional B-2s would reduce the cost of weapons expended by the bomber force by less than US$2 billion in 1995 dollars during the first two weeks of a conflict, which is when the Air Force envisions bombers would make their greatest contribution. This is a small fraction of the US$26.8 billion (in 1995 dollars) life cycle cost that the CBO projected an additional 20 B-2s would cost.

In 1997, as Ranking Member of the House Armed Services Committee and National Security Committee, Congressman Ron Dellums (D-CA), a long-time opponent of the bomber, cited five independent studies and offered an amendment to that year's defense authorization bill to cap production of the bombers with the existing 21 aircraft. The amendment was narrowly defeated. Nonetheless, Congress did not approve funding for the purchase of any additional B-2 bombers.

Upgrades

A number of upgrade packages were applied to the B-2 during the 21st century. In 2004, Northrop Grumman tested a new alternate high-frequency material (AHFM) for use as a radar-absorbent material coating for the B-2. The Air Force Research Laboratory has developed a new material to be used on the part of the wing trailing edge that is subject to engine exhaust to replace the current material that degrades. In 2008, the US Congress funded upgrades to the B-2s weapon control systems for hitting moving targets.

In July 2008, the B-2's computing architecture was redesigned with a new integrated processing unit (IPU) that communicates via a fiber optic network and a smaller, faster single-board processor that runs a new version of the operational flight program (OFP) software converted from JOVIAL to C by automated tools.

On 29 December 2008, Air Force officials awarded a production contract to Northrop Grumman to modernize the B-2 fleet's radar. The contract provides advanced state-of-the-art radar components, with the aim of sustained operational viability of the B-2 fleet into the future. The contract has a target value of approximately US$468 million. The award follows successful flight testing with the upgraded equipment. A modification to the radar was needed since the U.S. Department of Commerce required the B-2 to use a different radar frequency. It was reported on 22 July 2009 that the B-2 had passed the second of the two USAF audit milestones associated with this upgraded AESA radar capability.

On 28 April 2009, an Air Force/contractor team verified that the Massive Ordnance Penetrator (MOP) would fit in the B-2's bomb bay.

Design

The B-2's low-observable, or "stealth", characteristics give it the ability to penetrate an enemy's most sophisticated anti-aircraft defenses to attack its most heavily defended targets. The bomber's stealth comes from a combination of reduced acoustic, infrared, visual and radar signatures, making it difficult for opposition defenses to detect, track and engage the aircraft. Many specific aspects of the low-observability process remain classified. The B-2's composite materials, special coatings and flying wing design, which reduces the number of leading edges, contribute to its stealth characteristics. The Spirit has a radar signature of about 0.1 m². Each B-2 requires a climate-controlled hangar large enough for its wingspan to protect the operational integrity of its sophisticated radar absorbent material and coatings. The engines are buried within the wing to conceal the induction fans and hide their exhaust.

The blending of low-observable technologies with high aerodynamic efficiency and large payload gives the B-2 significant advantages over previous bombers. The U.S. Air Force reports its range as approximately . Also, its low-observation ability provides the B-2 greater freedom of action at high altitudes, thus increasing its range and providing a better field of view for the aircraft's sensors. It combines GPS Aided Targeting System (GATS) with GPS-aided bombs such as Joint Direct Attack Munition (JDAM). This uses its passive electronically scanned array APQ-181 radar to correct GPS errors of targets and gain much better than laser-guided weapon accuracy when "unguided" gravity bombs are equipped with a GPS-aided "smart" guidance tail kit. It can bomb 16 targets in a single pass when equipped with 1,000 or 2,000-pound (450 kg or 900 kg) bombs, or as many as 80 when carrying bombs.

sits inside the cockpit of a B-2 with pilot Capt. Luke Jayne during a visit to Whiteman AFB in 2006.]]

The B-2 has a crew of two: a pilot in the left seat, and mission commander in the right. For comparison, the B-1B has a crew of four and the B-52 has a crew of five.

As with the Boeing B-52 Stratofortress and Rockwell B-1 Lancer, the B-2 provides the versatility inherent in manned bombers. Like other bombers, its assigned targets can be canceled or changed while in flight, the particular weapon assigned to a target can be changed, and the timing of attack, or the route to the target can be changed while in flight.

which extends its range past to support intercontinental sorties.]]

The prime contractor, responsible for overall system design, integration and support, is Northrop Grumman. Boeing, Raytheon (formerly Hughes Aircraft), G.E. and Vought Aircraft Industries, are subcontractors.

The original B-2 design had tanks for a contrail-inhibiting chemical, but this was replaced in the final design with a contrail sensor from Ophir that alerts the pilot when he should change altitude. Mission planning also considers altitudes where the probability of contrail formation is minimized.

Operational history

The first operational aircraft, christened Spirit of Missouri, was delivered to Whiteman Air Force Base, Missouri, where the fleet is based, on 17 December 1993. The B-2 reached initial operational capability (IOC) on 1 January 1997. Depot maintenance for the B-2 is accomplished by U.S. Air Force contractor support and managed at Oklahoma City Air Logistics Center at Tinker Air Force Base. Originally designed to deliver nuclear weapons, modern usage has shifted towards a flexible role with conventional and nuclear capability.

Into combat

, Guam, 2004]]

The B-2 has seen service in four campaigns. Its combat debut was during the Kosovo War in 1999. It was responsible for destroying 33% of selected Serbian bombing targets in the first eight weeks of U.S. involvement in the War.

video]]

The B-2 has been used to drop bombs on Afghanistan in support of the War in Afghanistan. With the support of aerial refueling, the B-2 flew one of its longest missions to date from Whiteman Air Force Base, Missouri to Afghanistan and back.

The B-2's combat use preceded a U.S. Air Force declaration of "full operational capability" in December 2003.

In March 2011, B-2s were the first US aircraft into action in Operation Odyssey Dawn, the UN mandated enforcement of the Libyan no-fly zone. Three B-2s dropped 40 bombs on a Libyan airfield in support of the UN no-fly zone.

Replacement

When the B-2 is no longer able to penetrate enemy defenses, the role of the manned nuclear armed penetration bomber may be taken up by the Lockheed Martin F-35 Lightning II, which also carries the B61 nuclear bomb, but as a tactical bomber is not covered by strategic arms limitation treaties such as New START.

Operators

at Andersen AFB in Guam on 23 June 2006]]

B-2s are operated exclusively by the United States Air Force active units.

United States Air Force

*509th Bomb Wing, Whiteman Air Force Base (currently has 19 B-2s)

**393d Bomb Squadron

**394th Combat Training Squadron

131st Bomb Wing, Whiteman Air Force Base (Missouri Air National Guard)

**110th Bomb Squadron

*412th Test Wing, Edwards Air Force Base (currently has one B-2)

**419th Flight Test Squadron

*53d Wing, Eglin Air Force Base (former)

**72d Test and Evaluation Squadron, Whiteman Air Force Base

*57th Wing, Nellis Air Force Base (former)

**325th Weapons Squadron, Whiteman Air Force Base

**715th Weapons Squadron (inactivated)

Accident

On 23 February 2008, the B-2 Spirit of Kansas, 89-0127 crashed on the runway shortly after takeoff from Andersen Air Force Base in Guam. B-2 89-0127 had been operated by the 393rd Bomb Squadron, 509th Bomb Wing, Whiteman Air Force Base, Missouri, and had logged 5,176 flight hours. It was the first crash of a B-2. The two person crew ejected safely from the aircraft and survived the crash. The aircraft was completely destroyed, a hull loss valued at US$1.4 billion. After the accident, the Air Force took the B-2 fleet off operational status until clearing the fleet for flight status 53 days later on 15 April 2008. The cause of the crash was later determined to be moisture in the aircraft's Port Transducer Units during air data calibration. The moisture distorted the information being sent to the bomber's air data system. As a result, the flight control computers calculated an inaccurate airspeed, and a negative angle of attack, causing the aircraft to pitch upward 30 degrees during takeoff.

Aircraft on display

of a B-2 Spirit on display at the National Museum of the United States Air Force ]]

Because of its high cost, strategic bombing role, and the still-classified aspects of its low observable coatings, no production B-2 has been placed on permanent display. However, B-2s have made periodic appearances on ground display at various air shows.

In 2004, one of the test articles (s/n AT-1000) built without engines or instruments for static testing was placed on display at the National Museum of the United States Air Force near Dayton, Ohio. The test article passed all structural testing. The Museum's restoration team spent over a year reassembling the fractured airframe.

From 1989 to 2004, the South Dakota Air and Space Museum located on the grounds of Ellsworth Air Force Base displayed the 10-short-ton (9-metric-ton) "Honda- Stealth", a 60% scale mock-up of a stealthy bomber which had been built by North American Honda in 1988 for an advertising campaign. Although not an actual replica of a B-2, the mock-up was close enough to the B-2's design to arouse suspicion that Honda had intercepted classified, top secret information, as the B-2 project was still officially classified in 1988. Honda donated the model to the museum in 1989, on condition that the model be destroyed if it was ever replaced with a different example. In 2005, when the museum received a B-1 Lancer for display (Ellsworth being a B-1 base), the museum destroyed the mock-up.

Specifications (B-2A Block 30)

References

;Notes

;Bibliography

Donald, David, ed. Black Jets: The Development and Operation of America's Most Secret Warplanes. Norwalk, Connecticut: AIRtime Publishing Inc., 2003. ISBN 1-880588-67-6.

Eden, Paul. "Northrop Grumman B-2 Spirit". Encyclopedia of Modern Military Aircraft. New York: Amber Books, 2004. ISBN 1-90468-784-9.

Goodall, James C. "The Northrop B-2A Stealth Bomber." America's Stealth Fighters and Bombers: B-2, F-117, YF-22, and YF-23. St. Paul, MN: MBI Publishing Company, 1992. ISBN 0-87938-609-6.

Pace, Steve. B-2 Spirit: The Most Capable War Machine on the Planet. New York: McGraw-Hill, 1999. ISBN 0-07-134433-0. .

Richardson, Doug. Northrop B-2 Spirit (Classic Warplanes). New York: Smithmark Publishers Inc., 1991. ISBN 0-8317-1404-2.

Richardson, Doug. Stealth Warplanes. London: Salamander Books Ltd, 2001. ISBN 0-7603-1051-3.

Sorenson, David, S. The Politics of Strategic Aircraft Modernization. New York: Greenwood Publishing Group, 1995 ISBN 978-0275952587.

Spick, Mike. "B-2 Spirit", The Great Book of Modern Warplanes. St. Paul, Minnesota: MBI Publishing Company, 2000. ISBN 0-7603-0893-4.

Winchester, Jim, ed. "Northrop B-2 Spirit". Modern Military Aircraft (Aviation Factfile). Rochester, Kent, UK: Grange Books plc, 2004. ISBN 1-84013-640-5.

The World's Great Stealth and Reconnaissance Aircraft. New York: Smithmark, 1991. ISBN 0-8317-9558-1.

External links

B-2 Spirit fact sheet and gallery on U.S. Air Force site

B-2 Spirit page on Northrop Grumman site

B-2 page on NASA Langley site

B-2 Spirit page at GlobalSecurity.org

B-2 Bomber page on Center for Defense Information site

B-2 Spirit Stealth bomber on airforce-technology.com

B-2 Spirit (Stealth Bomber) page on aircraft-info.net

B-2 Stealth Bomber article on How It Works Daily

B-02 Spirit Category:Flying wing aircraft Category:Stealth aircraft Category:United States bomber aircraft 1980-1989 Category:Northrop Grumman aircraft Category:Black projects