【布里顿-诺曼BN-2岛民飞机】
布里顿-诺曼 BN-2 岛民（英文：Britten-Norman BN-2 Islander）是英国的轻型通用飞机与支线客机。由英国布里顿-诺曼公司设计制造。目前750架在用。全世界超过30个国家的军队或执法机构使用该型号飞机。
==开发==
===起源===
In 1953, Britten-Norman was formed for the purpose of converting and operating agricultural aircraft, amongst other vehicles such as the Cushioncraft hovercraft. In 1963, the firm initiated development work upon what would become the Islander, having sensed a demand for a single and inexpensive twin-piston engine aircraft. The founders, John Britten and Desmond Norman, had observed the rapid growth of the commuter airline sector, and concluded that capacity was of a higher value to these operators than either range or cruising speed, thus the Islander emphasized payload over either of these attributes.
Through the use of low wing- and span-loading to generate greater effectiveness than conventional counterparts, the Islander could lift considerably heavier payloads than the typical aircraft in its power, weight or cost classes. To reduce manufacturing costs, both the wings and tail surfaces maintain a constant chord and thickness, while the ribs within the aircraft's wing are all identical; both rivets and external fishplate joints are used for the same purpose. The type was originally intended to use a fabric-and-steel design. A light alloy monocoque approach was adopted instead. The structure is designed to give rise to and experience low levels of stress, and has an infinite fatigue life without testing.
The prototype BN-2 Islander displayed at the 1965 Paris Air Show six days after its maiden flight
On 13 June 1965, the first prototype BN-2 Islander conducted its maiden flight, powered by a pair of Rolls-Royce/Continental IO-360B piston engines; only four days later, the prototype appeared at the Paris Air Show. The IO-360B engines were later replaced by more powerful Lycoming O-540-E engines, which were located further outboard on the wings, for superior single-engine climb performance. On 20 August 1966, a second BN-2 prototype performed its first flight. These prototype aircraft, while resembling subsequent production models for the most part, were outfitted with different, less powerful engines. On 24 April 1967, the first production Islander performed its first flight; UK type certification was received in August 1967, US authorities also certified the type in December 1967.
Initial production of the Islander started at the Britten-Norman factory at Bembridge on the Isle of Wight; however, within a few years the company found that it could not produce the aircraft at a sufficient rate to keep up with the customer demand. To expand production, a contract was placed with Intreprinderea de Reparatii Material Aeronautic (IRMA) of Romania, initially to assemble kit-form aircraft, which were then sent to the UK for completion. In August 1969, the first Romanian-assembled Islander performed its first flight. IRMA proved successful at economically producing the aircraft, producing roughly 30-40 aircraft per year at times, and eventually became the primary manufacturing site for the Islander. In 1977, IRMA received a contract for the production of a further 100 Islanders; from that point on, the firm produced all subsequent Islander aircraft. More than 500 of the type were manufactured in Romania.
In 1970, a military version of the Islander, marketed as the Defender, conducted its first flight. Modifications included the addition of underwing hardpoints for armaments/equipment, and the main cabin area being fitted out for light troop transport and support aircraft duties. The Defender capitalised on the aircraft's rugged structure, making it suitable for long-term operations in developing countries. Purchases from police and military customers have typically been for use in surveillance and counter-terrorism operations. The Maritime Defender is another military version of the Islander, intended for search and rescue, coastal patrol and fishery protection.
A Seychellois Stamp with an illustration of a Britten-Norman Islander, 1981
===Further development===
Despite the relative success of the Islander, Britten-Norman experienced wider financial difficulties during the late 1960s, ultimately resulting in the company entering receivership in October 1971. In August 1972, Britten-Norman was purchased by the Fairey Aviation Group, forming the Fairey Britten-Norman company; shortly thereafter, the majority of manufacturing activity for both the Islander and Trislander was transferred to its Avions Fairey factory in Gosselies, Belgium. Completed aircraft were flown to Bembridge for final customer preparation prior to delivery.
Inflight BN-2T
Fairey Aviation set about the development of a more powerful model, the Turbo Islander, equipped with a pair of Lycoming LTP101 turboprop engines. However, testing revealed that the LTP101 engines were too powerful for the aircraft; thus, following a period of re-designing, the project evolved into the Turbine Islander (BN-2T), equipped with a pair of Allison 250 turboprop engines instead. However, Fairey itself encountered financial difficulty, resulting in the Fairey Britten-Norman company entering receivership and the firm's acquisition by Oerlikon Buerle of Switzerland, leading to the formation of Pilatus Britten-Norman, at which point some production activity was transferred back to Bembridge.
Another development was a turbo-normalizing system with RaJay turbocharger for the -2, -3, -6, -8, and -9 models allowing full power up to 14,000 feet with attendant increase in true airspeed and takeoff and climb performance. Presently Talco in Texas holds the STC.
In 1969, an improved version, the BN-2A Islander, conducted its maiden flight. It incorporated aerodynamic and flight equipment improvements, such as lower-drag engine cowlings and undercarriage, an improved interior, and an expanded rear baggage area with external access. In 1970, to improve hot-and-high performance, more powerful Lycoming O-540-K1-B5 engines were made available, alongside optional tiptanks and an elongated nose to house baggage.
Islander equipped with ducted fans, 1978
In 1977, a single standard BN-2 was re-engined with Dowty Rotol ducted fans. The ducted fan produced less noise than conventional propeller propulsion. Some structural strengthening of the main wing spar at the root was required due to the extra weight. This aircraft was subject to 18 months of flying trials to test the suitability of the ducted fan as a means of reducing aircraft noise; these tests reportedly demonstrated a 20 decibel noise reduction as well as increased thrust and reduced pollution.
In 1978, a further improved version, the BN-2B Islander II, was produced as a result of a product improvement program. The BN-2B model involved several changes, including a redesigned cockpit and a reduction in cabin noise levels. In 1980, it was decided to make available turboprop engines for the type, adopting twin Allison 250-B17C engines; when the latter are installed, the aircraft is designated the BN-2T Turbine Islander. The first such BN-2T entered service in 1981.
In February 1999, the acquisition of Romaero, the Romanian manufacturer of the Islander, by Britten-Norman Group was announced. By May 2006, a greater sales emphasis was being placed upon the Defender over the Islander. In December 2006, aerospace publication Flight International observed that: "The only civil aircraft that remains in production in the UK is the tiny Britten-Norman Islander". In May 2010, Britten-Norman announced that manufacturing of the Islander would be relocated from Romania to a new site in the UK, due to the rising costs of production in Romania.
====Electric Project Fresson====
Supported by Britten-Norman, Cranfield Aerospace wants to develop an electric propulsion system for the over 700 Islanders currently operated.
===Trislander===
In 1968, the original second Islander prototype was re-used for a further development programme, being modified into a stretched aircraft with greater capacity, referred to as the Super Islander. However, the Super Islander programme was aborted without proceeding to certification. The prototype later received further design changes to produce the three-engined version, the BN-2A Mk III Trislander. This aircraft has a stretched fuselage, modified landing gear and a third engine, which is mounted on the tail. On 11 September 1970, the Trislander prototype conducted its maiden flight, appearing at the 1970 Farnborough Air Show the same day.
==设计==
Cockpit of a BN-2 Islander
The Britten-Norman BN-2 Islander is a high-wing cantilever monoplane with a rectangular fuselage and two wing-mounted engines; early aircraft were equipped with a pair of piston engines while later production models may be alternatively fitted with turboprop engines in their place. The rectangular cross section fuselage, which is furnished with a conventional tail unit and fixed tricycle landing gear, typically accommodates a single pilot and up to nine passengers in a commuter configuration, each row being accessed by its own door; the cabin can be rapidly reconfigured, allowing for a single aircraft to undertake a diverse range of tasks within a minimal period of time. Often referring to the type as "The world's most versatile aircraft", Britten-Norman promotes the Islander's low direct operating costs, minimal maintenance, and its stability in flight as major attributes of the aircraft.
The original Islander was designed with an emphasis upon providing ease of access within the short haul sector to remote locations as a safe, efficient, and profitable transport aircraft. It has been regularly used by such operators, including the frequent use of unprepared rough airstrips and from challenging terrain; the Islander being capable of short takeoff and landing (STOL) operations. The low load height and wide side doors provide for easy access for passenger and cargo operations, while the aircraft's ability to maintain a high takeoff frequency has led to the type's use for parachuting. For operating within noise-sensitive environments, silencers can be equipped on both the aircraft's engine and propellers.
Exit in a parachuting exercise
Designed as a small and inexpensive commuter/utility aircraft, various cabin configurations and equipment loadouts are available to suit a wide variety of different purposes, including charter flights, scheduled flights, agricultural uses, aerial firefighting, air freight VIP/executive transport, aerial surveillance, air ambulance, paradropping, and law enforcement. The design programme can be entirely personalized, allowing each customer to be involved in every area of the aircraft's manufacture to mold it to their preferences. Later versions of the Islander offer various options, including enlarged bay doors, 3-bladed scimitar propellers, low drag fairings, modern interior, ergonomic leather seating, in-flight entertainment systems, and alternative seat arrangements; underwing hardpoints can also be installed for carrying pod, spray booms and other external stores.
==使用历史==
Immediately following commercial availability, US distributor Jonas Aircraft ordered 30 Islanders, and placed orders for another 112 aircraft within a year. When equipped with four 54-gallon fuel tanks, the Islander was able to ferry itself across the transatlantic route, via Gander International Airport, Newfoundland, for US deliveries. The Islander's long-range capabilities were highlighted when the type won the 1969 London-Sydney air race.
In 1974, sales of the Islander surpassed the 548-order record for British multi-engine commercial aircraft. In 1982, another production milestone was reached with the delivery of the 1,000th Islander. From the 1980s onwards, sales noticeably declined; according to Britten-Norman Chief Executive William Hynett, this was due to the global market having become saturated by the type and there being only a low civil demand for additional aircraft, in part due to the longevity of in-service Islanders. As of 2016, Britten-Norman claim that the Islander is in daily service with roughly 500 operators in more than 120 countries.
Between 1976 and 2006, Scottish airline Loganair operated a number of Islanders as air ambulances, covering areas such as the island communities in the Hebrides. The Islander services Loganair's Westray to Papa Westray flight, the shortest scheduled flight in the world at abbr=on; the scheduled flight time including taxiing is two minutes.
Several commuter airlines and general aviation charter operators in the U.S. also flew the Islander including Stol Air Commuter in scheduled passenger service in northern California from their San Francisco International Airport (SFO) hub and Channel Islands Aviation in southern California which used the aircraft for the flights to Channel Islands National Park. Another U.S. commuter airline operator was Wings Airways which operated high frequency shuttle service into the Philadelphia International Airport (PHL).
By October 2019, 800 Islanders were in service including around 600 used for short flights.
==型号==
来源:
BN-2
Prototype first flown in 1966 with two 260 hp Lycoming O-540-E4B5 piston engines.
BN-2A
Production version with minor modification from prototype and increased takeoff weight.
BN-2A-2
A BN-2A with modified flaps, and two 300 hp Lycoming IO-540-K1B5 (fuel injected) engines.
BN-2A-3
A BN-2A-2 with increased wingspan and fitted with extra wingtip fuel tanks.
BN-2A-6
A BN-2A with wing leading edge modifications and two 260 hp Lycoming O-540-E4C5 engine.
BN-2A-7
A BN-2A-6 with increased wingspan and fuel capacity.
BN-2A-8
A BN-2A-6 with droop flaps.
BN-2A-9
A BN-2A-7 with droop flaps.
BN-2A-10
A BN-2A-8 with increased takeoff weight and 270 hp Lycoming TIO-540-H1A (turbo-charged, fuel injected) engines.
BN-2A-20
A BN-2A-2 with increased takeoff weight and minor improvements.
BN-2A-21
A BN-2A-3 with increased takeoff weight.
BN-2A-23
A BN-2A-21 with lengthened nose.
BN-2A-24
A BN-2A-26 with lengthened nose.
BN-2A-25
A BN-2A-27 with lengthened nose.
BN-2A-26
A BN-2A-8 with increased takeoff weight.
BN-2A-27
A BN-2A-9 with increased takeoff weight.
BN-2A-30
A BN-2A-20 fitted with floats. Twin floats were attached to the undercarriage legs and incorporated retractable landing gear.
BN-2A-41
Turbo Islander with lengthened nose, droop flaps and two Lycoming LTP-101 turboprops, first flown in 1977.
Britten-Norman BN-2B Defender
A Maltese Air Force Islander
Defender military variant with 300 hp IO-540-K1B5 engines and underwing hard points and military modifications.
BN-2B-20
A BN-2A-20 with improved soundproofing and increased landing weight and other minor modifications.
BN-2B-21
A BN-2A-21 with Model B improvements.
BN-2B-26
A BN-2A-26 with Model B improvements.
BN-2B-27
A BN-2A-27 with Model B improvements.
BN-2T
Turbine Islander based on BN-2A-26 with two 320 shp Allison 250-B17C turboprops.  Seating for up to 9 passengers.
Islander CC2 of the RAF
Islander AL1
Variant of the BN-2T for communications and reconnaissance duties with the British Army; seven built. Used for aerial reconnaissance and photography in Northern Ireland during Operation Banner by No. 1 Flight, Army Air Corps based at Aldergrove. Redesignated Islander R1 in 2019 after being transferred to the Royal Air Force.
Islander CC2 and CC2A
Variant of the BN-2T for the Royal Air Force; three operated. These aircraft were retired from the RAF in 2017.
Maritime-Defender
Armed maritime reconnaissance and patrol aircraft.
BN-2A-III Trislander
Three-engined Trislander, a stretched BN-2A with 18 seats and three 260 hp Lycoming O-540-E4C5 piston engines.
==用户==
===军用与执法===
==== 在用 ====
* 伯利兹国防军
* 博茨瓦纳空军
* 缅甸空军
* 柬埔寨王家空军
Central African Republic
* 中非共和国空军
* 塞浦路斯空军
* 塞浦路斯警察
Denmark
* 丹麦国土安全部队
Democratic Republic of the Congo
* 刚果民主共和国空军
* 芬兰空军
Gambia
* 冈比亚国防军
* 加纳空军
* 圭亚那国防军
* 印度海军
** 印度海军航空兵
* 印度尼西亚陆军
* 爱尔兰空军/爱尔兰和平卫队（警察）
* 以色列空军
* 牙买加国防军
* 皇家约旦空军
* 马达加斯加人民武装力量
* 马里空军
* 马拉维国防军
* 马耳他空军
* 毛里塔尼亚国防军
Mauritius
* 毛里求斯国防军
* 墨西哥空军
* 尼泊尔陆军
** 尼泊尔陆军航空兵
* 荷兰国家警察
* 阿曼皇家空军
* 阿曼皇家警察
* 巴拿马国防军
* 巴基斯坦海军
** 巴基斯坦海军航空兵
* 巴基斯坦海岸警卫队
* 秘鲁国家警察
* 菲律宾海军 - 用于侦察联络。许可制造
* 菲律宾海岸警卫队 - 用于侦察、搜救
* 卡塔尔皇家空军
* 卢旺达国防军
* 塞内加尔空军
* 塞舌尔空军
South Africa
* 南非空军
* 苏里南空军
* 北爱尔兰警察
* 英国皇家空军 -  R Mk1型号2019年从英国陆军调入。 2017年部署了 CC Mk2型号
* 英国海岸警卫队
Abu Dhabi /
* 阿联酋空军
* 委内瑞拉陆军
* 委内瑞拉国民卫队
* 扎伊尔空军
* 赞比亚空军
==== 以前 ====
* 安哥拉空军
* 比利时陆军
* 比利时宪兵
Ciskei
* 西斯凯国防军
Haiti
* 海地武装力量
*皇家香港辅助空军
*伊拉克空军
* 马拉维警察部队
* 菲律宾空军 - 许可制造
Rhodesia
* 罗德西亚空军
* 罗马尼亚空军
* 索马里空军
Abu Dhabi /
* 阿布迪拜国防军空军
===民用===
Antigua and Barbuda
*Carib Aviation
*LIAT
*Cape Air Transport
*Golden Eagle Airlines
*Airlines of Tasmania
*Lady Elliot Island Eco-Resort (Seair Pacific)
Bahamas
*阿巴科航空
Belize
*Maya Island Air
*Gulf Aviation
Barbados
*Aero Services
*Tropical Air Services
*Aero Star
*VOTEC
British Virgin Islands
*Air BVI- 前用户
*Air Montmagny(2)
* Alair MHA Enterprises (1)
* Gillam Air Services (1) - 前用户
* Gold Belt Air Transport - 前用户
* Great River Air (2)
*Maritime Air Charter- 前用户
* Northstar Air Tours (1)
*Sable Aviation(1)
* Sander Geophysics (2)
* South Nahanni Airways (1)
* Strait Air - 前用户
* Top of the World Flying Services - 前用户
* Tsayta Aviation (1)
* Villers Air Services (1)
* Wagner Aviation - 前用户
*Archipiélagos Aviación operates the two Islanders in Chile and the former South Pacific Korp aircraft
*South Pacific Korp
*TAVINA
*Falck Air- 拥有3架岛民：BN-2A-9 (OY-DZV), BN-2A-20 (OY-RPZ)，BN-2B-26 (OY-CFV)
*Emetebe Airlines Galapagos
*Avies Ltd.
*Skydive Estonia
*Air Fiji
*Northern Air (Fiji
*Pacific Island Air
* 太平洋太阳航空
*AEROSOTRAVIA
*Airawak
*Air Caledonie
*St Barth Commuter
* Air Hamburg
* Bremerhaven Airline
*FLN Frisia Luftverkehr
* Helgoland Airlines
* Holiday Express
*LFH
*Luftfahrtgesellschaft Walter
*OLT
* Stuttgarter Flugdienst
* 汉堡航空
*Olympic Airways 前用户
*Air Services Ltd
*Roraima Airways Ltd
*Trans Guyana Airways
*Aerolineas Sosa
*Flugfelag Vestmannaeyja
*Aer Arann Islands
*Garda Air Support Unit 爱尔兰警察
*Ayit Aviation
*Aertirrena
*Trans Jamaican Airlines
*Air Dolphin
* 第一航空
* 旭伸航空 - 2008年10月1日停运
* 新中央航空
* 新日本航空
* 琉球空中通勤
* 海豚航空
*珊瑚太阳航空 (2)
*马拉维航空
*马来西亚国际航空
* 毛里求斯海岸警卫队
*Aero Taxis de CV
*Aero Sudpacífico
*Divi Divi Air (2)
*EZAir (1)
*向风快运航空   (2)
*向风群岛航空
*Aspiring Air Wanaka
*Fly My Sky 奥克兰 (4)
*Great Barrier Airlines 奥克兰 (2)
*Island Air Charters前用户
*Mount Cook Airline前用户
*Real Journeys Queenstown
*Stewart Island Flights Invercargill
*Wings over Whales Kaikoura
* Aero Taxi Intl
*Air Panama
* ANSA
* AVIATUR
* Aviones de Panama S.A.
* PARSA
* TRANSPASA
*Mid-Sea Express
*Pacificair
*ATA-Aerocondor
*Oceanair-Transportes Aéreos Regionais - Azores Islands
*TAC-Transportes Aéreos Continentais
*TAT-Transportes Aéreos de Timor- 葡属东帝汶
*Air Flamenco
*Vieques Air Link
*Regional Air Services
*SVG Air
Saint Kitts and Nevis
*Nevis Express (1993-2003)
*Air Samoa
*玻里尼西亚航空
*Caricom Airways
*Gum Air
*大鹏航空
*国华航空
*群鹰翔国土资源航空
*RVL Aviation - 前用户
* 2Excel Aviation Ltd
*Air Alderney
* APEM Aviation - 前用户
*Aurigny Air Services, (海峡群岛) (1968 - c.1990)
* 蓝色群岛航空, (海峡群岛)
* Channel Islands Air Search, (海峡群岛)
*Cheshire Police - 前用户
*英国海岸警卫队 前用户
*福克兰群岛政府航空服务
*大曼彻斯特警察 前用户
*Hampshire Police
*Hebridean Air Services
*Highland Airways
*Isles of Scilly Skybus
* 洛根航空
*Marine Fisheries Agency
* Precision Terrain Surveys Ltd
*RVL Aviation 前用户
* Skydive Headcorn
Gem Air LLC- Salmon, Idaho
*Aero International- Florida - 前用户
*Air Bahia
*Air Carolina- Florence, South Carolina - 前用户
* AmericAir - Washington Dulles International Airport - 前用户
* 美属萨摩亚政府
*Boise Air Service- Boise, Idaho
* Cape Air
* Channel Islands Aviation - Camarillo, California
* Commutaire International Airways - Florida - 前用户
* Great Northern Air
* Griffing Flying Service - Port Clinton, Ohio
* Harbor Airlines - Oak Harbor, Washington State
* Homer Air - Alaska
* Iliamna Air Taxi - Alaska
*Inter Island Airways- 美属萨摩亚
*Island Air Charters- Florida
*Island Air Service- Kodiak, Alaska
*Island Airways- Beaver Island, Michigan (4) - 在用
*LAB Flying Service- Juneau, Alaska
*McCall Aviation- McCall, Idaho
* Munz Northern Airlines - Nome, Alaska (12) - 前用户
*New England Airlines- Westerly, Rhode Island - 在用
* Pelican Airways
* Princeton Airways - Princeton Airport, New Jersey - 前用户
*Rediske Air- Alaska
*Salmon Air- Salmon, Idaho -前用户
*San Juan Airlines- Friday Harbor, Washington State
*Servant Air- Kodiak, Alaska
* Slocum Airlines - Florida - 前用户
* SouthCentral Air - 阿拉斯加 前用户
*South Pacific Island Airways - Guam - 前用户
*Stol Air Commuter- San Francisco, California - 前用户
* Tropic Air Charters - Ft. Lauderdale, Florida
*Wheeler Airlines- 前用户
* Williams Air - 前用户
*Wings Airways- Blue Bell, Pennsylvania - 前用户
*瓦努阿图航空
*Transaven
*Proflight Zambia
*Zamfari Limited卢萨卡
==事故==
2005 Loganair Islander accident残骸
* 1996 Loganair Islander accident
* 2005 Loganair Islander accident
* 2005 L.A.B. Flying Service accident
* 2012年大鹏航空BN-2空难
* 委内瑞拉环空BN-2A-27坠毁事件 2013年
* 2016 Sunbird Aviation crash
==技术性能 (BN-2A 岛民)==
前视图
侧视图
低展弦比
飞行中