The Kawasaki P-1 (previously P-X, XP-1) is a Japanese maritime patrol aircraft developed and manufactured by Kawasaki Aerospace Company. Unlike many maritime patrol aircraft, which are typically conversions of civilian designs, the P-1 is a purpose-built maritime aircraft with no civil counterpart and was designed from the onset for the role. It has the distinction of being the first operational aircraft in the world to make use of a fly-by-light control system.
|Role||Maritime patrol aircraft|
|Manufacturer||Kawasaki Aerospace Company|
|First flight||28 September 2007|
|Status||In service (33)|
|Primary user||Japan Maritime Self-Defense Force|
¥17.5 billion / US$164 million each (2015)
The P-1 has entered service with the Japan Maritime Self-Defense Force (JMSDF) as a replacement for the P-3C Orion. On 26 March 2013, the JMSDF took delivery of the first two operational P-1 aircraft. Export customers are also being sought for the type as part of a general loosening of Japanese military export restrictions.
Observing that its fleet of P-3C aircraft had been in service for some time, the JMSDF began searching for a replacement maritime patrol aircraft. Since other similar aircraft produced abroad did not meet the JMSDF's requirements, the development of a purpose-built indigenous aircraft became necessary. The Japanese Defense Agency (JDA) submitted the domestic development of a P-X maritime patrol aircraft as part of its April 2001 – March 2006 Five-Year Defense Plan. In 2001, following its earlier proposal, the Kawasaki Aerospace Company received prime contractor status for the P-X program, as well as the adjacent C-X program for a next generation cargo aircraft; this selection process occurred almost 30 years since the previous large-scale domestic development of an aircraft in Japan.
The P-X shares some components with the C-X, later designated as the twin-engined Kawasaki C-2, another indigenously-developed aircraft to replace the Kawasaki C-1 and C-130H Hercules cargo aircraft. Although the P-X and C-X designs were originally independent, it was decided that having common components to both designs would be useful. The JDA mandated that the two aircraft share identical body components; common components include the cockpit windows, outer wings, horizontal stabilizer, and other systems. Internal shared parts include the auxiliary power unit, cockpit panel, flight control system computer, anti-collision lights, and gear control unit. Due to the different roles of the two aircraft, they remain distinctly separate. The sharing of development resources had allowed for a large reduction in overall development costs which, when including the C-2, were reported as being 345 billion Yen ($3 billion) in 2007.
In addition to a level of commonality with the C-2, one proposed derivative of the P-1 is a civilian airliner, the proposed project has typically been referred to as the Kawasaki YPX. If development is pursued, the YPX would make extensive use of technology and components of the P-1, such as the wingbox, empennage, and fuselage.
An indigenously produced turbofan engine, the IHI Corporation F7, was also developed to power the P-X. By April 2004, the JDA had completed a successful evaluation of five XF7 research engines, by which point it was viewed as being the sole candidate powerplant for the P-X program. In May 2005, the IHI Corporation received a contract for an additional seven XF-7 test engines from the JDA following the completion of initial tests in December 2004, four of these engines were to equip the first flight test aircraft. The Full Authority Digital Engine Control (FADEC)-equipped F7 engine had a bypass ratio of 8:1, which was reported as being substantially higher than rivals such as the General Electric CF34-8E.
In April 2004, Japan and US extended discussions on potential cooperative efforts on the P-X and US Navy's Multi-mission Maritime Aircraft (MMA) programmes; options ranged from terminating the P-X program to participate in the US-led MMA program to incorporating some of the MMA's technology onto the P-X to reduce costs. The Japanese Defence Ministry ultimately opted to persist with the P-X program, stating that: "there was a possibility that foreign aircraft would not satisfy the required capability and there was a possibility that foreign aircraft would not meet the required period of introduction...it is necessary to domestically develop the aircraft". In addition to the P-1, studies were also conducted into the use of ship-based UAVs to support maritime aviation activities.
Since 2014, Japan has been making approaches to other nations for prospective export sales of the P-1. New Zealand is the first country to which the P-1 has been offered in what has been referred to by a Japanese official as a "one on one fight with Boeing's P-8 patrol plane." The P-1 is being offered in conjunction with the C-2 to give New Zealand the advantage of commonality for their patrol and transport aircraft.
Japanese officials have claimed that the P-1 is a more capable, albeit more expensive, aircraft than the Boeing P-8 Poseidon; in comparison to the P-8, the P-1 has a greater range, a larger bomb bay, and has been purpose-built for the maritime patrol mission. Prior to 2015, the P-1 was being procured at a typical rate of one or two aircraft deliveries per year; in 2015, this changed to a bulk order for 20 P-1s as part of a measure to cut the aircraft's unit costs. By October 2016, 10 P-1s had been delivered to the JMSDF, with 60 or more aircraft needed to replace Japan's P-3C fleet; production will rise to about five annually.
The Kawasaki P-1 is a purpose-built maritime patrol aircraft equipped with four engines. The P-1 is powered by four podded IHI F7-10 turbofan engines underneath the low-set wings. The four-engine low-wing loading design adopted for the P-1 results in a flight profile with better maneuverability and stability at low-speed, low-altitude flight and allows the aircraft to continue its mission in the event of a single engine failure as well as greater operational survivability, the high-bypass engines provide for quiet, fuel-efficient operation. The P-1 has reduced transit times in comparison to turboprop-powered competitors, and the turbofans are quieter, making it more difficult for submerged submarines to detect it acoustically.
The P-1 is equipped with many newly developed technologies and features, particularly in terms of its avionics and missions systems. One such key feature is the use of a fly-by-light flight control system. This has the effect of decreasing electro-magnetic disturbances to the sensors in comparison to more common fly-by-wire control systems. The P-1 is the first production aircraft in the world to be equipped with such a flight control system. Various onboard systems are provided by Honeywell, who is the largest non-Japanese supplier to the project, such as the auxiliary power unit, environmental and pressurization control systems, ram air turbine, sonobuoy dispensers and elements of the avionics.
The P-1 is equipped with various sensors to enable the aircraft to perform its primary purpose of detecting submarines and surface vessels; these include the Toshiba HPS-106 active electronically scanned array (AESA) radar which uses a total of four antennas to provide 360 degree coverage, and Infrared/Light detection systems for surface detection. The P-1 is also furnished with a CAE Inc.-built magnetic anomaly detector (MAD) embedded into the aircraft's tail, along with deployable sonobuoys, which is used for the detection of submerged submarines. Sophisticated acoustic systems are also used for this purpose. The P-1 has an artificial intelligence (AI) system to assist TACCO operations; similar to the SH-60K, this advanced combat direction system directs the TACCO operator to the optimal flight course to attack a submarine.
A large bomb bay housed within the main fuselage, similar in size to that of the Hawker Siddeley Nimrod's, contains the bulk of the aircraft's munitions, the bomb bay is supplemented by a total of eight external hardpoints mounted on the wings. Weapons available on the P-1 include torpedoes, mines, depth charges, air-to-surface missiles (ASMs) (such as the US-built Harpoon), or bombs. Armaments are managed by a Smith Aerospace-built stores management system, which includes a newly developed Universal Stores Control Unit (USCU) capable of accommodating hundreds of different munitions, including future ones and precision weapons. Multiple radar warning receivers provide all-round awareness of missile threats, which is combined with a defensive countermeasures suite.
On 31 August 2007, the Japanese Ministry of Defense revealed that they would procure four production airframes. The request in the FY2008 budget was 67.9 billion yen, or about US$566 million, the unit price for each aircraft at US$141.5 million. In 2013, the ministry ordered two units for ¥44.5 billion. These P-1s were reported to possess increased detection/discrimination capability, flight performance, information processing capability, and strike capabilities as a successor to the existing P-3C fixed-wing patrol aircraft.
In June 2007, Kawasaki rolled out the XP-1, a prototype for the P-X program. The rollout had been delayed for three months due to the discovery of defective rivets provided by a US supplier which required remedial repairs to be performed. On 28 September 2007, the XP-1 conducted its maiden flight from Gifu Air Field, Kakamigahara, Gifu, Japan; this flight lasted about one hour and ended successfully. The P-X was redesignated XP-1 at this time. By March 2010, Kawasaki Heavy Industries had delivered four XP-1 maritime patrol test aircraft to Japanese Ministry of Defense; the company also stated its aim for type certification to be achieved in time for the formal delivery of the first two aircraft by the end of March 2012.
On 8 August 2011, the Japanese Ministry of Defense announced that two aircraft used for ground testing had developed tears in various parts of the craft, including the fuel tank and central part of the fuselage. In response, modifications to reinforce the affected areas were planned. By October 2012, the problems had been reportedly resolved. On 26 March 2013, Japan's Maritime Self-Defense Force took delivery of its first pair of P-1s, ahead of a planned two years of test flights. On 14 May 2013, these aircraft were grounded after one developed an unstable combustion condition in some of its engines during mid-flight.
During efforts to sell the aircraft to the UK, a pair of P-1s (one of Air Development Squadron 51 and one of Air Patrol Squadron 3 were present for the 2015 Royal International Air Tattoo, one aircraft performing a flying display while the other was on static display; this was the first time that any Japanese military aircraft had performed in a European flight display. After its UK appearance, the P-1s proceeded to the Japan Self-Defense Force Base Djibouti at Ambouli International Airport, Djibouti, to continue with operational trials within tropical and desert climates.
In November 2016, two P-1s in New Zealand to celebrate the Royal New Zealand Navy's 75th anniversary took part in damage surveys after the 2016 Kaikoura earthquake along with P-3 Orions of the Royal New Zealand Air Force and the United States Navy.
In August 2017 Air Patrol Squadron 3 became the first all P-1 operational squadron.
In December 2018, the Japanese Ministry of Defense alleged that a Gwanggaeto the Great-class destroyer of the South Korean Navy locked its separate target illumination radar onto a P-1 belonging to Air Patrol Squadron 3. The South Korean Navy stated that it had used the radar of an optical camera system and not a fire control system. The incident led to a diplomatic row between Japan and South Korea. 
France and GermanyEdit
In January 2015, it was reported that Tokyo was holding a series of defence talks with the United Kingdom to ascertain a possible sale of P-1s to the Royal Air Force to replace their recently retired fleet of Hawker Siddeley Nimrod patrol aircraft. The proposal was part of a wider initiative to lower restrictions on Japanese military exports. It was claimed that Britain may consider jointly manufacturing the type, and that the nation could retain rights over related radar and sensor technologies. On November 23, 2015 the UK announced it would buy the Boeing P-8 Poseidon instead of the Kawasaki P-1.
New Zealand requested information on the P-1 and Kawasaki C-2 to meet the country's patrol and transport aircraft needs. This request was met with unclassified information in September 2016 and a more detailed proposal including purchase price, manufacturing arrangements, and maintenance complete by mid-2017. This put the P-1 in direct competition with the P-8. On July 9th 2018 it was announced that New Zealand had selected the P-8.
- Crew: Flight: 3 Mission: 8
- Length: 38.0 m (124 ft 8 in)
- Wingspan: 35.4 m (114 ft 8 in)
- Height: 12.1 m (39 ft 4 in)
- Max. takeoff weight: 79,700 kg (176,000 lb)
- Powerplant: 4 × IHI Corporation F7 turbofan, 13,500 lbs (60 kN) each
- Maximum speed: 996 km/h (538 knots, 619 mph)
- Cruise speed: 833 km/h (450 knots, 516 mph)
- Range: 8,000 km in unarmed configuration (4,320 nm, 4,970 mi)
- Combat radius: 2,500 km in armed configuration (1,350 nm, 1555 mi)
- Service ceiling: 44,200 ft (13,520 m)
- Hardpoint: 8 wing stations in total (2x on each wing and 2x on each wing root) and eight internal bomb bay stations
- Bombs: 9,000+ kg (20,000+ lb)
- Missiles: AGM-84 Harpoon, ASM-1C, AGM-65 Maverick
- Sonobuoys: 30+ Pre-loaded, 70+ Deployable from inside
- Other: MK-46 and Type 97 and new (G-RX5) torpedoes, mines, depth charges
- Radar: Toshiba, Active Electronically Scanned Array radar system
- Sonar: NEC, multi-static sound navigation system sound
- Anti-submarine systems:SHINKO ELECTRIC CO.LTD., Advanced combat direction system
- Other: Mitsubishi, Electronic countermeasures (CMD, RWR, MWS, ESM)
|Footage of the P-1's first flight in September 2007|
|Video of P-1 taxing, taking off, and landing|
|A P-1 performing an flight display at RIAT 2015|
Aircraft of comparable role, configuration and era
- BAE Systems Nimrod MRA4
- Boeing P-8 Poseidon
- Bombardier Aerospace DHC-8-MPA-D8
- Breguet Atlantic
- EADS CASA C-295 MPA
- Ilyushin Il-38
- Lockheed P-3 Orion
- "KHI gives MSDF first P-1 antisub patrol aircraft". The Japan Times. 27 March 2013.
- "Defense Programs and Budget of Japan: Overview of FY2015 Budget." Japanese Ministry of Defense, January 2015.
- "Sky-High Expectations for Japan’s P-X and C-X Aircraft." Archived 2011-06-05 at the Wayback Machine Kawasaki Heavy Industries Scope Quarterly Newsletter, No.73. October 2007.
- "P-1&C-X development reference paper."[permanent dead link] TRDI Defense Technology Symposium, 2007. pp. 4–6.
- "中日新聞:＜蜜月の終焉＞ ミライズに固執:防衛利権 蜜月の構図(CHUNICHI Web)." Archived 2009-02-11 at the Wayback Machine Chunichi Shimbun, 2008.
- Perrett, Bradley (15 August 2008). "Kawasaki Studies Advanced, Lightweight Competitor to CSeries". Aviation Week and Space Technology. McGraw-Hill.
- "FARNBOROUGH 2008: Japan eyes slice of CSeries market." Flight International, 15 July 2008.
- Govindasamy, Siva. "Kawasaki talks civil." Flight International, 23 September 2008.
- Sobie, Brendan. "IHI backs GE's CF6 engine proposal." Flight International, 27 May 2003.
- Sobie, Brendan. "Japan amends five-year plan as priorities change." Flight International, 18 May 2004.
- Sobie, Brendan. "IHI wins deal to manufacture more P-X engines." Flight International, 3 May 2005.
- "Japan reveals novel XF7 engine design features." Flight International, 11 October 2005.
- "Japan extends talks with USA." Flight International, 13 April 2004.
- Waldron, Greg, "IN FOCUS: China crisis adds urgency to Japanese air force modernisation." Flight International, 8 October 2012.
- Waldron, Greg. "Japan's defence budget places premium on airpower." Flight International, 19 December 2013.
- "Tim Huxley: Japan’s P-1 leads defence export drive." IISS Defence and Military Analysis Programme, 11 September 2015.
- "DUBAI: Kawasaki talks up its aerospace portfolio." Flight International, 8 November 2015.
- "Japan in talks with New Zealand for defense aircraft". Nikkei Asian Review. Nikkei. 3 January 2017. Retrieved 3 January 2017.
- Gady, Franz-Stefan. "Japan Seeks To Export its New Sub-Hunting Plane." The Diplomat, 9 July 2015.
- Waldron, Greg. "Japan defence budget calls for 20 P-1s, 5 V-22s." Flight International, 14 January 2015.
- JAPAN AEROSPACE: Kawasaki takes aim at international P-1 deals – Flightglobal.com, 12 October 2016
- Gardner, Richard. "Rising sun breaks cover on Japanese defense industry ." SAE International, 24 July 2015.
- "Contracts." Flight International, 18 May 2004.
- Minnick, Wendell. "Honeywell to Outfit Japan P-1 Maritime Aircraft." Defense News, 16 February 2016.
- "Contracts." Flight International, 24 February 2004.
- P-1&C-X project reference paper[permanent dead link] p. 13. in TRDI Defense Technology Symposium 2007
- P-1 & C-X development reference paper, pp. 12–13.
- "Policy assessment's outline paper about P-1's production" (PDF). Archived from the original (PDF) on September 30, 2007. Cite uses deprecated parameter
- "Versatile Smiths' military millions." Flight International, 16 June 2005.
- "Policy assessment's reference paper about P-1 production" (PDF). Archived from the original (PDF) on September 30, 2007. Cite uses deprecated parameter
- "New Japanese budget to include first P-X maritime patrol aircraft." Flight International, 10 September 2007.
- "Defense Programs and Budget of Japan: Overview of FY2013 Budget Request." Japanese Ministry of Defense, September 2012.
- Dron, Alan. "New transport and patrol pair from Kawasaki." Flight International, 21 June 2007.
- Hirokawa, Seiji. "Production fault hits Kawasaki transport and MPA projects." Flight International, 5 June 2007.
- "Production fault hits Kawasaki transport and MPA projects." Flight International, 13 February 2007.
- "防衛省技術研究本部". mod.go.jp. Technical Research & Development Institute. Archived from the original on 2008-09-25. Cite uses deprecated parameter
- Francis, Leithen. "Japan's test programme for maritime patrol and transport aircraft under way." Flight International, 29 March 2010.
- Waldron, Greg (8 August 2011). "Kawasaki XP-1 develops cracks in ground testing". Flightglobal.com. Archived from the original on 9 August 2011. Cite uses deprecated parameter
- "KHI gives MSDF first P-1 antisub patrol aircraft". The Japan Times Online. 27 March 2013. Retrieved 21 June 2013.
- "New MSDF patrol jets grounded since May". The Japan Times Online. The Japan Times. 21 June 2013.
- Thompson, Paul JMSDF Squadron Histories J-HangarSpace Retrieved September 29, 2017
- "Japan Makes Air Tattoo History." Archived 2015-07-07 at the Wayback Machine Royal Air Force Charitable Trust, 7 July 2015.
- "Japanese patrol planes to star at Royal International Air Tattoo." Swindon Advertiser, 8 July 2015.
- "Ｐ－１哨戒機のジブチで運用試験実施 及び英国ロイヤル・ンターナ 及び英国ロイヤル・ンターナ 及び英国ロイヤル・ンターナショナル・エアタトゥーへの 参加 について." Japanese Ministry of Defense, 7 July 2015.
- New Zealand Outlines Airlift, Maritime Patrol Aircraft Needs November 22, 2016 Retrieved November 23, 2016
- Osborne, Tony (June 21, 2017). "Double First For Kawasaki P-1 at Paris Air Show". Aviation Week. Retrieved July 7, 2018.
- 厚木航空基地HP トピックス：Ｐ－１への移行完了 Retrieved September 28, 2017 (in Japanese)
- Jeong, Jeff (December 27, 2018). "Is "radar feud" sign of future military confrontation between South Korea and Japan?". Defense News.
- Yeo, Mike (April 25, 2018). "Japan eyes Franco-German maritime patrol aircraft requirement despite export setbacks". Defense News. Retrieved July 7, 2018.
- Kubo, Nobuhiro (April 25, 2018). "Japan seeks role in French-German marine surveillance plane project: sources". Reuters. Retrieved July 7, 2018.
- Grevatt, Jon (April 27, 2018). "Japan explores P-1 opportunities in Europe". Jane's Information Group. Retrieved July 7, 2018.
- Thailand Mulling Purchase of Japanese Sub-Hunting Aircraft June 7, 2016 The Diplomat Retrieved December 9, 2016
- http://asia.nikkei.com/Politics-Economy/International-Relations/Vietnam-eyes-secondhand-Japanese-defense-gear June 26, 2016 Archived November 24, 2016, at the Wayback Machine Nikkei Asian Review
- Vietnam’s Defence Boom Entices Global Firms August 5, 2016 Retrieved November 24th 2016
- Tim Huxley: Japan’s P-1 leads defence export drive Military Balance Blog Retrieved November 24, 2016
- Kelly, Tim and Nobuhiro Kubo. "Exclusive: Japan seeks to sell sub-hunting jet to UK as Abe pushes arms exports." Reuters, 7 January 2015.
- "PM pledges £178 billion investment in defence kit". UK Ministry of Defence. 23 November 2015.
- "National Security Strategy and Strategic Defence and Security Review" (PDF). UK Ministry of Defence. 23 November 2015. Retrieved 23 November 2015.
- Sachdeva, Sam. "Govt signs off $2b NZDF plane deal by Sam Sachdeva - Newsroom Pro". Newsroom Pro. Archived from the original on 2018-07-09. Retrieved 2018-07-10. Cite uses deprecated parameter
- Reed Business Information Limited. "VIDEO: Japan's Kawasaki XP-1 patrol aircraft makes first flight". flightglobal.com.
- ARG. "Kawasaki P-1 Maritime Patrol Aircraft - Military-Today.com". www.military-today.com.
- "【航空部隊】これが哨戒機「P-1」". YouTube. Retrieved 23 May 2017.
- "MPX / P-X / P-1 Maritime Patrol Aircraft Follow-on". GlobalSecurity.org. Retrieved 23 May 2017.
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