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Nimrod MRA4
Nimrod MRA4 during a test flight
Role Maritime patrol aircraft
National origin United Kingdom
Manufacturer BAE Systems
First flight 26 August 2004[1]
Status Cancelled
Number built 3 development plus 2 production[2]
Developed from Hawker Siddeley Nimrod MR2

TheBAE Systems Nimrod MRA4was a plannedmaritime patrol and attackaircraft intended to replace theHawker Siddeley Nimrod MR2.The rebuilt aircraft would have extended the operating life of the Nimrod fleet by several decades and significantly improved the aircraft by installing more efficientRolls-Royce BR700turbofanjet engines to almost double the flightrange.The conversion of the flight deck to a digitalglass cockpitwould have simplified control operations and reduced crew requirements. New detection systems were to be installed, as well as additional weapons foranti-submarine warfare.

However, the project was subject to significant delays due to cost overruns and contract re-negotiations. This was partly due to difficulties combining refurbished Nimrod MR2 fuselages, which had not been built to a common standard, with newly built wings. The numbers of aircraft to be procured fell from twenty-one to nine over a course of years, while costs continued to climb.

The MRA4 was ultimately cancelled in 2010 as a result of theStrategic Defence and Security Review(SDSR), at which point it was £789 million over-budget and over nine years late. No direct replacement was under development at that stage, with the roles intended for the MRA4 filled by existing assets such as theType 23 Frigateand theMerlin helicopter.However the UK announced its intention to order nineP-8 PoseidonASW aircraft as part of the 2015 SDSR at a cost of £3 billion; these aircraft were delivered between October 2019 and January 2022 and operate fromRAF Lossiemouthin Scotland.

Development[edit]

Origins[edit]

In 1990 the UK abandoned options for avionics, sensors and tactical system upgrades of the MR2.[3]In 1993 the RAF issued a request for information for a Replacement Maritime Patrol Aircraft (RMPA) procurement programme, also known as Staff Requirement (Air) 420, which was intended to replace their fleet of Nimrod MR2 aircraft.[3]In response to the requirement, several different companies soon submitted their bids to meet the outlined demands.[3]British Aerospace(BAe), which had studied prospective options to replace the Nimrod MR2 since 1986, including a variant of theAirbus A310and other civil conversion projects, ultimately settled on a proposal that involved an extensive rebuild of existing Nimrod MR2s marketed under the nameNimrod 2000.As well as operational performance, the key criteria were cost and a short procurement timescale; these "ruled out a new design or adaption of an existing civil aircraft."[4]

BAe evaluated several different engines to power the Nimrod 2000, such as theRolls-RoyceTayturbofan, thePratt & Whitney JT8D-200turbofan, and theGeneral Electric CF34turbofan,[5]before settling upon the Rolls-RoyceBR710engine. In 1995, it was claimed that the Nimrod MR2 airframes were of a sufficient condition in that they could readily serve through the intended 25-year service life and that "retained airframe items are low risk".[6]According to BAe, the Nimrod's airframe represented "probably the best understood airframe in the RAF inventory".[3]

Amongst various other bids submitted wereLockheed Corporation,which marketed itsP-3 Orionas theOrion 2000,Loral Corporationproposed to rebuild ex-US NavyOrions, andDassaultwhich sought to develop the improvedAtlantique 3.[3][6][7]On 12 January 1996, Dassault announced that they had withdrawn their Atlantique 3 following discussions with the MOD;Whitehallsources stated that Dassault had found "...no value in pursuing its tender", and that the RAF had an expressed preference for a four-engine aircraft.[8]

In March 1996, BAe promoted the option of establishing a production line to manufacture new-build Nimrod aircraft as an alternative to the refurbishment of existing airframes, which was reportedly motivated by service concerns regarding attrition rates of the existing aircraft.[9]It was also announced that preliminary talks had been conducted with theSouth African Air Forceon the topic of the Nimrod 2000.[9]In June 1996, BAe announced that it had partnered withMcDonnell Douglasto market new-build Nimrod 2000s to the export market; it has been claimed that this move was in response to scepticism from the MoD over the prospects of export sales for the type.[10]BAe argued that the Nimrod 2000's selection would give it entry to the global maritime patrol aircraft market.[3]

As part of Lockheed's submission, the firm offered a formal guarantee of a 20 per cent workshare on all future export sales of its Orion 2000 while simultaneously lobbying for the US Navy to also procure the type.[7]Loral stated that it believed that its bid to refurbish stored P-3s was the most cost-effective submission; however, there was public controversy over whether Loral possessed the necessary technical information on the airframe, claims which Loral refuted.[3]In early 1996, Loral's defense assets were acquired by Lockheed, leaving just the latter and British Aerospace in the competition by mid-1996.[8]In May 1996, it was reported that bidders were considering self-funding their own early development costs in order to compensate for alleged funding shortfalls within the MoD's procurement budget; it was claimed that these funding shortfalls were due to differences between the original specification, which had envisioned as anoff-the-shelfprocurement without much in terms of development, and the increasingly extensive nature that the programme had progressively taken on.[11]

Selection[edit]

In June 1996, the MoD's Equipment Approvals Committee recommended that the Nimrod 2000 bid be selected to meet the RAF's requirement.[12]In July 1996, in response to the committee's decision, Lockheed Martin announced that it had reduced the cost of its Orion 2000 submission by 15 per cent amid a series of last-minute discussions held between Lockheed Martin PresidentNorman R. Augustine,General Electric Company PresidentLord Weinstock,Secretary of State for DefenceMichael PortilloandDeputy Prime MinisterMichael Heseltine,seeking a 90-day interval to fully revise their bid.[13]In July 1996, it was announced that the £2 billion contract had been awarded to British Aerospace to produce the Nimrod 2000.[14]By the time of formal contract award in December the aircraft had received thedesignationNimrod MRA4.[15]

The Nimrod MRA4 was to be produced as essentially a new aircraft. Significant changes were involved in the remanufacturing process, including the installation of BR710 turbofan engines, the adoption of a larger and more efficient wing with 23% greater surface area, various new missions systems and avionics, and an extensively refurbished fuselage.[3][16]Much larger air intakes were required on the MRA4 in order to provide the necessary airflow requirements imposed by the BR710 engine, which is significantly greater than that of the Spey 250 that had powered the original Nimrod variants.[6]The larger wing increased fuel capacity by 30% which, combined with efficient modern engines, allowed for unrefuelled endurance in excess of 14 hours.[4]The MRA4 had also borrowed heavily fromAirbustechnology; theglass cockpitused was derived from that used on Airbus A320/A340airliners.[17]BAe also teamed up withBoeingto provide the Nimrod MRA4's mission systems, making use of the latter's work on mooted patrol aircraft systems for the P-3 andBoeing 737.[3][6]

According to BAE Systems, the Nimrod MRA4's systems would enable the crews to gather, process and display up to 20 times more technical and strategic data than the MR2. TheSearchwater 2000 MR radarwas stated to have been capable over land as well as water; with the ability to have swept an area the size of the UK every 10 seconds.[18]TheAircraft Synthetic Training Aids(ASTA) provided byThales Training & Simulationwas an electronic training suite to allow the training of crew members to transfer from active MRA4 aircraft to ground-based training systems; this change was made to increase the availability of the aircraft for operational missions and allow for more intensive training exercises.[19]

Delays and development problems[edit]

The original scheduled date of entry into service for the MRA4 was April 2003; however, development proved far more protracted than anticipated.[20][21]Early on, an independent company,Flight Refuelling Ltd., had been contracted to undertake the conversions to MRA4 standard, however BAE discovered that the Nimrod airframes supplied by the RAF were not built to a common standard and this considerably complicated the refurbishment process. The task of converting the existing airframes was transferred in-house to BAE SystemsWoodford.[22][23]The BAE team at Woodford then found that the new wing was flawed, which resulted in the project being put on hold while another wing design was developed.[22]

In December 2002, BAE Systems issued a shock profit warning due to cost overruns of the Nimrod MRA4 and theAstute-class submarineprojects.[24]On 19 February 2003, BAE took a charge of £500 million against the MRA4 contract.[25]The company had previously taken a £300 million "loss charge" in 2000, which was expected to cover "all the costs of completion of the current contract".[26]The contract was renegotiated for the second time in 2002, where the aircraft requirement was reduced from 21 to 18.[27]

Nimrod MRA4 at theFarnborough Airshow

Announcing plans for the future of the British military on 21 July 2004, the Defence SecretaryGeoff Hoondetailed plans to reduce the upgrade programme to cover only 16 MRA4 aircraft, and suggested that an eventual fleet of 12 might suffice.[28]PA01, the first development MRA4, completed its maiden flight on 26 August 2004.[29]This was followed by PA02's first flight in December 2004 which was used to test elements of the mission system and the air vehicle.[30]BAE Systems received a contract worth £1.1 billion for 12 MRA4s on 18 July 2006; three were to be development aircraft and nine more converted to production standard.[31]The Nimrod MRA4 successfully released theSting Ray torpedofor the first time on 30 July 2007.[32][33]

Further disputes over cost meant that the number of MRA4s to be delivered was further reduced to nine by Spring 2008.[27]The first production aircraft took its maiden flight on 10 September 2009.[34]At the time of the flight, each MRA4 was to cost at least £400 million.[35]The Ministry of Defence announced in December 2009 that the introduction of the MRA4 would be delayed until 2012 as part of defence spending cuts.[36]In March 2010, the first production Nimrod MRA4 was delivered to the RAF for acceptance testing; in August 2010, the RAF launched its instructor training course using the type.[37]The MRA4 fleet was expected to attaininitial operational capabilityin October 2012. The Nimrod MRA4 was planned to operate out from its main base atRAF Kinloss,Scotland.[38]

Cancellation[edit]

"[The] loss of the capability offered by the Nimrod [MRA4] would have an adverse effect on the protection of the strategic nuclear deterrent [Trident missilesonVanguard-class submarines], the provision of which is one of the Ministry of Defence's Standing Strategic Tasks. In addition, the maintenance of the integrity of the UK through detection of hostile air and sea craft would be compromised. "

National Audit Office[39]

In the 2010Strategic Defence and Security Reviewof the Armed Forces, the UK government announced the cancellation of the MRA4 on 19 October 2010 and consequently that RAF Kinloss, the intended base for the Nimrod fleet, would be closed.[40]On 24 November 2010, 382 sub-contract workers previously working on the MRA4 were laid off at BAE SystemsWartonand Woodford.[41]After the airframes were stripped of electronic equipment, the remaining fuselages were scrapped at BAE Systems Woodford beginning on 26 January 2011. Although the process was conducted behind screens intended to hide the process from the media, theBBCflew a helicopter over Woodford and broadcast footage of the scrapping in progress.[42]

Although late and over-budget the decision to cancel the MRA4 was controversial as the remaining airframes had all been near completion.[43]It has been reported that following the retirement of the Nimrod MR2 (in March 2010[44]), Russian submarines have been able to travel past the UK in international waters, but they could not be tracked because of the lack of suitable aircraft.[43]In November and early December 2014 four maritime patrol aircraft operated by France, Canada and the United States were based atRAF Lossiemouthto attempt to locate a Russian submarine which had been spotted in British territorial waters off west Scotland.[45]

The aircraft would also have been used in the civiliansearch and rescuerole; the Nimrod MR2 had often been used in this role. In this respect the Strategic Defence and Security Review stated that the UK "will depend on other maritime assets to contribute to the tasks previously planned for [the Nimrod MRA4]".[46]

Nimrod airframes being broken up for scrap in January 2011

Following the cancellation, the Defence SecretaryLiam Foxused the Nimrod MRA4 procurement as an example of the worst of MOD procurement performance: "The idea that we ever allow ourselves into a position where something that was originally Nimrod 2000 – where we ordered [21] was reduced to nine, spent £3.8bn and we still weren't close to getting the capability – is not to happen again."[47]Nevertheless, six ex-defence chiefs publicly criticised the decision to scrap the Nimrods in January 2011[48]and thePublic Accounts Committeeconcluded in February 2012 that the decision had been made without a proper understanding of the cost implications and had wasted £3.4bn.[49][50]

In January 2011 it was reported by theFinancial Timesthat when the decision was taken to scrap the aircraft, "[The MRA4] was still riddled with flaws.... Safety tests conducted [in 2010] found there were still 'several hundred design non-compliances' with the aircraft. It was unclear, for example, whether its bomb bay doors functioned properly, whether its landing gear worked and, most worryingly, whether its fuel pipe was safe."[51]According toAir Forces Monthlymagazine, "significant aerodynamic issues and associated flying control concerns in certain regimes of flight meant that it was grounded at the time of cancellation and may not have been signed over as safe by the Military Aviation Authority." The magazine also stated that the reason for the cancellation was that the RAF and Navy placed a higher priority on fast jets and frigates than on maritime patrol.[52]

Replacement[edit]

A RAF P-8 Poseidon in 2022

Reports in mid-2011 suggested that a purchase of up to fiveP-8 Poseidonswas under consideration,[53]while in January 2015 it was reported that attempts had been made to sell theKawasaki P-1as another possible replacement.[54]In November 2015, as part of theStrategic Defence and Security Review,theMinistry of Defenceannounced the procurement of nine P-8 Poseidons, which will undertake the range of tasks that were undertaken by the Nimrod MR.2 and intended for the MRA.4.[55]The RAF took delivery of its first Poseidon MRA1 in Seattle in October 2019 and the aircraft arrived in the UK in February 2020.[56]

Specifications (MRA4)[edit]

Data fromRAF Aircraft - Nimrod MR2/R1[57]

General characteristics

  • Crew:10
  • Length:126 ft 9 in (38.63 m)
  • Wingspan:127 ft (39 m)
  • Height:31 ft 0 in (9.45 m)
  • Wing area:2,538 sq ft (235.8 m2)
  • Empty weight:114,000 lb (51,710 kg)
  • Max takeoff weight:232,315 lb (105,376 kg)
  • Powerplant:4 ×Rolls-Royce BR710turbofanengines, 15,500 lbf (69 kN) thrust each

Performance

  • Maximum speed:496 kn (571 mph, 919 km/h)
  • Maximum speed:Mach 0.77
  • Range:6,004 nmi (6,909 mi, 11,119 km)
  • Service ceiling:36,000 ft (11,000 m)

Armament

Avionics

See also[edit]

Related development

Aircraft of comparable role, configuration, and era

References[edit]

Wikimedia Commons has media related toNimrod MRA4.
  1. ^"Nimrod MRA4 First Flight".Defence Procurement Agency. 20 September 2005. Archived fromthe originalon 12 October 2005.
  2. ^"BAE jobs fears in Woodford after Nimrod axed".BBC News.19 October 2010.
  3. ^abcdefghiBarrie, Douglas and Graham Warwick."Something old, something new, something borrowed..."Flight International,15 May 1996.
  4. ^abDawes, Alan (July 2002). "Nimrod MRA.4".AIR International.Key Publishing Ltd.
  5. ^"GE improves CF34 bid for Nimrod 2000."Flight International,17 April 1996.
  6. ^abcdBarrie, Douglas."Re-engineing RAF Nimrods powers BAe's RMPA bid."Flight International,29 November 1995.
  7. ^ab"RMPA contenders step up campaign."Flight International,1 May 1996.
  8. ^ab"Dassault abandons RAF bid."Flight International,31 January 1996.
  9. ^abBarrie, Douglas."BAe offers to build new Nimrod 2000s for RAF."Flight International,27 March 1996.
  10. ^"BAe teams up with MDC for Nimrod relaunch plans."Flight International,12 June 1996.
  11. ^Barrie, Douglas."UK monetary constraints force RPMA cost rethink."Flight International,15 May 1996.
  12. ^"Nimrod 2000 wins UK MoD approval."Flight International,26 June 1996.
  13. ^"Augustine bids for RAF RMPA reprieve."Flight International,10 July 1996.
  14. ^Cunningham, Sarah (26 July 1996). "Shares take heart from Pounds £4bn defence contracts".The Times.
  15. ^"Nimrod MRA4 still in trouble".Journal of Electronic Defense.26(4): 34. April 2003.
  16. ^"Reborn in an old skin."Flight International,23 July 2002.
  17. ^Davis, N.J. (1998)."Nimrod MRA4: Collaborative Crew Performance Challenges"(PDF).rta.nato.int. Archived fromthe original(PDF)on 22 July 2011.Retrieved17 February2011.
  18. ^"Nimrod MRA4".BAE Systems.Retrieved16 February2011.
  19. ^"Milestone achieved in Nimrod MRA4 Synthetic Training Requirement."Archived10 January 2009 at theWayback Machineasd-network.com.Retrieved: 20 October 2010.
  20. ^Gethin, Howard."Delays hit Nimrod 2000 update."Flight International.24 March 1999.
  21. ^"BAE slows Nimrod schedule in bid to cut programme problems."Flight International,25 February 2003.
  22. ^ab"Nimrod MRA4 makes debut at last".The Engineer.26 October 2009.
  23. ^"British Aerospace reins in Nimrod work."Flight International,10 November 1999.
  24. ^Odell, Mark (12 December 2002). "BAE warning sends share price to 7-year low: News of 'additional issues' on two big defence contracts takes market by surprise".Financial Times.
  25. ^Odell, Mark (20 February 2003). "Whitehall re-draws key BAE defence contracts".Financial Times.
  26. ^Done, Kevin (13 December 2002). "Nimrod refit turns into nightmare".Financial Times.p. 24.
  27. ^ab"Ministry of Defence; The Major Projects Report 2010"(PDF).National Audit Office.15 October 2010.Retrieved14 June2010.
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  32. ^Boulton, Marc and Mike Sweeney."News release: Nimrod MRA4 Releases Sting Ray for First Time."BAE Systems,30 July 2007. Retrieved: 20 October 2010.
  33. ^Thisdell, Dan."Nimrod MRa4 reconnaissance aircraft passes torpedo drop test."flightglobal.com.Retrieved: 20 October 2010.
  34. ^Boulton, Marc and Lindsay Walls."First production Nimrod MRA4 takes to the skies."Archived23 September 2015 at theWayback Machinedefpro.com,14 September 2009. Retrieved: 14 September 2009.
  35. ^Page, Lewis."Nimrod MRA4 Product variant first flight."The Register,14 September 2009.
  36. ^"Defence Budget reprioritised to support Afghanistan operation."Ministry of Defence,viawww.mod.uk,15 December 2009. Retrieved: 17 December 2009.
  37. ^Hoyle, Craig."RAF launches first Nimrod MRA4 training course."Flight International,4 August 2010.
  38. ^"House of Commons Written Answers for 16 June 2010."Hansard,16 June 2010. Retrieved: 20 October 2010.
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