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A maritime patrol aircraft (MPA), also known as a patrol aircraft, maritime
reconnaissance aircraft A reconnaissance aircraft (colloquially, a spy plane) is a military aircraft designed or adapted to perform aerial reconnaissance with roles including collection of imagery intelligence (including using photography), signals intelligence, as ...
, or by the older American term patrol bomber, is a
fixed-wing aircraft A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane, which is capable of flight using wings that generate lift caused by the aircraft's forward airspeed and the shape of the wings. Fixed-wing aircraft are distinc ...
designed to operate for long durations over water in
maritime patrol {{Unreferenced, date=March 2008 Maritime patrol is the task of monitoring areas of water. Generally conducted by military and law enforcement agencies, maritime patrol is usually aimed at identifying human activities. Maritime patrol refers to ac ...
roles — in particular
anti-submarine warfare Anti-submarine warfare (ASW, or in older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are t ...
(ASW),
anti-ship warfare Anti-surface warfare (ASuW or ASUW) is the branch of naval warfare concerned with the suppression of surface combatants. More generally, it is any weapons, sensors, or operations intended to attack or limit the effectiveness of an adversary's su ...
(AShW), and
search and rescue Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...
(SAR). Among other maritime surveillance resources, such as
satellite A satellite or artificial satellite is an object intentionally placed into orbit in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope ...
s, ships,
unmanned aerial vehicle An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without any human pilot, crew, or passengers on board. UAVs are a component of an unmanned aircraft system (UAS), which includes adding a ground-based controller ...
s (UAVs) and
helicopter A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...
s, the MPA is an important asset. To perform ASW operations, MPAs typically carry air-deployable sonar buoys as well as
torpedo A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, su ...
es and are usually capable of extended flight at low altitudes.


History


First World War

The first aircraft that would now be identified as maritime patrol aircraft were flown by the
Royal Naval Air Service The Royal Naval Air Service (RNAS) was the air arm of the Royal Navy, under the direction of the Admiralty's Air Department, and existed formally from 1 July 1914 to 1 April 1918, when it was merged with the British Army's Royal Flying Corps t ...
and the French Aéronautique Maritime during the
First World War World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, primarily on anti-submarine patrols. France, Italy and Austria-Hungary used large numbers of smaller patrol aircraft for the
Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the e ...
,
Adriatic The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Sea) ...
and other coastal areas while the Germans and British fought over the North Sea. At first,
blimp A blimp, or non-rigid airship, is an airship (dirigible) without an internal structural framework or a keel. Unlike semi-rigid and rigid airships (e.g. Zeppelins), blimps rely on the pressure of the lifting gas (usually helium, rather than hydr ...
s and
zeppelin A Zeppelin is a type of rigid airship named after the German inventor Count Ferdinand von Zeppelin () who pioneered rigid airship development at the beginning of the 20th century. Zeppelin's notions were first formulated in 1874Eckener 1938, pp ...
s were the only aircraft capable of staying aloft for the longer ten hour patrols whilst carrying a useful payload while shorter-range patrols were mounted with landplanes such as the
Sopwith 1½ Strutter The Sopwith Strutter was a British single- or two-seat multi-role biplane aircraft of the First World War.Lake 2002, p. 40. It was the first British two-seat tractor fighter and the first British aircraft to enter service with a synchronised ...
.Jarrett 2009, p. 59. A number of specialized patrol balloons were built, particularly by the British, including the
SS class airship SS (''Submarine Scout'' or ''Sea Scout'') class airships were simple, cheap and easily assembled small non-rigid airships or "blimps" that were developed as a matter of some urgency to counter the German U-boat threat to British shipping during ...
of which 158 were built including subtypes.SS class airship.
Airship Heritage Trust. Retrieved on 18 March 2009.

Charles Vivian, E., ''A History of Aeronautics'' pt.3, ch.V. Retrieved on 28 March 2009.
As the conflict continued, numerous aircraft were developed specifically for the role, including small flying boats such as the
FBA Type C The FBA Type A and the similar Type B and C were a family of reconnaissance flying boats produced in France prior to and during World War I. Development All three were unequal-span pusher biplane flying boats with a single step hull with ash ...
, as well as large
floatplane A floatplane is a type of seaplane with one or more slender floats mounted under the fuselage to provide buoyancy. By contrast, a flying boat uses its fuselage for buoyancy. Either type of seaplane may also have landing gear suitable for land, ...
s such as the
Short 184 The Short Admiralty Type 184, often called the Short 225 after the power rating of the engine first fitted, was a British two-seat reconnaissance, bombing and torpedo carrying folding-wing seaplane designed by Horace Short of Short Brothers. It ...
, or
flying boat A flying boat is a type of fixed-winged seaplane with a hull, allowing it to land on water. It differs from a floatplane in that a flying boat's fuselage is purpose-designed for floatation and contains a hull, while floatplanes rely on fusela ...
s such as the
Felixstowe F.3 The Felixstowe F.3 was a British First World War flying boat, successor to the Felixstowe F.2 designed by Lieutenant Commander John Cyril Porte RN at the naval air station, Felixstowe. Design and development In February 1917, the first pro ...
.Thetford 1978, p. 198. Developments of the Felixstowe served with the
Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) and ...
until the mid 20s, and with the
US Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of ...
as the
Curtiss F5L The twin-engine F5L was one of the Felixstowe F series of flying boats developed by John Cyril Porte at the Seaplane Experimental Station, Felixstowe, England, during the First World War for production in America. A civilian version of the air ...
and
Naval Aircraft Factory PN The Naval Aircraft Factory PN was a series of open cockpit American flying boats of the 1920s and 1930s. A development of the Felixstowe F5L flying boat of the First World War, variants of the PN were built for the United States Navy by Douglas, ...
whose developments saw service until 1938. During the war, Dornier did considerable pioneering work in all aluminium aircraft structures while working for
Luftschiffbau Zeppelin Luftschiffbau Zeppelin GmbH is a German aircraft manufacturing company. It is perhaps best known for its leading role in the design and manufacture of rigid airships, commonly referred to as ''Zeppelins'' due to the company's prominence. The name ...
and built four large patrol flying boats, the last of which, the
Zeppelin-Lindau Rs.IV The Zeppelin-Lindau Rs.IV (known incorrectly postwar as the Dornier Rs.IV) was a ''Riesenflugzeug'' (Giant aircraft) monoplane all metal flying boat with a stressed skin hull and fuselage developed for the Imperial German Navy to perform long ra ...
, influenced development elsewhere resulting in the replacement of wooden hulls with metal ones, such as on the
Short Singapore The Short Singapore was a British multi-engined biplane flying boat built after the First World War. The design was developed into two four-engined versions: the prototype Singapore II and production Singapore III. The latter became the Royal ...
. The success of long range patrol aircraft led to the development of fighters specifically designed to intercept them, such as the
Hansa-Brandenburg W.29 The Hansa-Brandenburg W.29 was a German two-seat fighter floatplane which served in the closing months of World War I with the Imperial German Navy's () Naval Air Service () from bases on the North Sea coast. Background and description Hansa ...
.


Second World War

Many of the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
patrol airplanes were converted from either
bomber A bomber is a military combat aircraft designed to attack ground and naval targets by dropping air-to-ground weaponry (such as bombs), launching aerial torpedo, torpedoes, or deploying air-launched cruise missiles. The first use of bombs dropped ...
s or
airliner An airliner is a type of aircraft for transporting passengers and air cargo. Such aircraft are most often operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an ...
s, such as the
Lockheed Hudson The Lockheed Hudson is a light bomber and coastal reconnaissance aircraft built by the American Lockheed Aircraft Corporation. It was initially put into service by the Royal Air Force shortly before the outbreak of the Second World War and prim ...
which started out as the
Lockheed Model 14 Super Electra The Lockheed Model 14 Super Electra was an American civil passenger and cargo aircraft built by the Lockheed Aircraft Corporation during the late 1930s. An outgrowth of the earlier Model 10 Electra, the Model 14 was also developed into larger, ...
, as well as older biplane designs such as the
Supermarine Stranraer The Supermarine Stranraer is a flying boat designed and built by the British Supermarine Aviation Works company at Woolston, Southampton. It was developed during the 1930s on behalf of its principal operator, the Royal Air Force (RAF). It wa ...
, which had begun to be replaced by monoplanes just before the outbreak of war. The British in particular used obsolete bombers to supplement purpose-built aircraft for maritime patrol, such as the
Vickers Wellington The Vickers Wellington was a British twin-engined, long-range medium bomber. It was designed during the mid-1930s at Brooklands in Weybridge, Surrey. Led by Vickers-Armstrongs' chief designer Rex Pierson; a key feature of the aircraft is its g ...
and
Armstrong-Whitworth Whitley The Armstrong Whitworth A.W.38 Whitley was a British medium bomber aircraft of the 1930s. It was one of three twin-engined, front line medium bomber types that were in service with the Royal Air Force (RAF) at the outbreak of the Second World ...
,Andrews 1967, p. 14.Moyes 1967, p. 13. while the US relegated the
Douglas B-18 Bolo The Douglas B-18 Bolo is an American heavy bomber which served with the United States Army Air Corps and the Royal Canadian Air Force (as the Digby) during the late 1930s and early 1940s. The Bolo was developed by the Douglas Aircraft Company f ...
to the same role until better aircraft became available. Blimps were widely used by the
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
, especially in the warmer and calmer latitudes of the
Caribbean Sea The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...
,
the Bahamas The Bahamas (), officially the Commonwealth of The Bahamas, is an island country within the Lucayan Archipelago of the West Indies in the Atlantic Ocean, North Atlantic. It takes up 97% of the Lucayan Archipelago's land area and is home to ...
,
Bermuda ) , anthem = "God Save the King" , song_type = National song , song = " Hail to Bermuda" , image_map = , map_caption = , image_map2 = , mapsize2 = , map_caption2 = , subdivision_type = Sovereign state , subdivision_name = , e ...
, the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an oceanic basin, ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of ...
,
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...
,
Trinidad Trinidad is the larger and more populous of the two major islands of Trinidad and Tobago. The island lies off the northeastern coast of Venezuela and sits on the continental shelf of South America. It is often referred to as the southernmos ...
, and later
the Azores ) , motto =( en, "Rather die free than subjected in peace") , anthem= ( en, "Anthem of the Azores") , image_map=Locator_map_of_Azores_in_EU.svg , map_alt=Location of the Azores within the European Union , map_caption=Location of the Azores wi ...
. A number of special-purpose aircraft were also used in the conflict, including the American-made twin-engine
Consolidated PBY Catalina The Consolidated PBY Catalina is a flying boat and amphibious aircraft that was produced in the 1930s and 1940s. In Canadian service it was known as the Canso. It was one of the most widely used seaplanes of World War II. Catalinas served w ...
flying boats, and the large, four-engine British
Short Sunderland The Short S.25 Sunderland is a British flying boat patrol bomber, developed and constructed by Short Brothers for the Royal Air Force (RAF). The aircraft took its service name from the town (latterly, city) and port of Sunderland in North East ...
flying boats of the
Allies An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...
.Norris 1967, pp. 7, 10–11. In the Pacific theatre, the Catalina was gradually superseded by the longer-ranged
Martin PBM Mariner The Martin PBM Mariner was an American Maritime patrol aircraft, patrol bomber flying boat of World War II and the early Cold War era. It was designed to complement the Consolidated PBY Catalina and Consolidated PB2Y Coronado, PB2Y Coronado in s ...
flying boat.Dorr 1987, p. 116. For the
Axis Powers The Axis powers, ; it, Potenze dell'Asse ; ja, 枢軸国 ''Sūjikukoku'', group=nb originally called the Rome–Berlin Axis, was a military coalition that initiated World War II and fought against the Allies. Its principal members were ...
, there were the long-range Japanese
Kawanishi H6K The Kawanishi H6K was an Imperial Japanese Navy flying boat produced by the Kawanishi Aircraft Company and used during World War II for maritime patrol duties. The Allied reporting name for the type was Mavis; the Navy designation was . Design ...
and
Kawanishi H8K The Kawanishi H8K was a flying boat used by the Imperial Japanese Navy Air Service during World War II for maritime patrol duties. The Allied reporting name for the type was "Emily". The Kawanishi H8K was a large, four-engine aircraft designed ...
flying boats, and the German
Blohm & Voss BV 138 The Blohm & Voss BV 138 ''Seedrache'' (Sea Dragon), but nicknamed ''Der Fliegende Holzschuh'' ("flying clog",Nowarra 1997, original German title of the Schiffer book. from the side-view shape of its fuselage, as well as a play on the title of th ...
diesel-engined trimotor flying boat, as well as the converted
Focke-Wulf Fw 200 Condor The Focke-Wulf Fw 200 ''Condor'', also known as ''Kurier'' to the Allies (English: Courier), was a German all-metal four-engined monoplane originally developed by Focke-Wulf as a long-range airliner. A Japanese request for a long-range maritime p ...
airliner landplane.Seifert, Karl-Dieter. "Der Deutsche Luftverkehr 1926 - 1945." Bernard & Graefe Verlag, Bonn, 1996. . (in German) pp. 303-304."Concise Guide to Axis Aircraft of World War II." Compiler: David Mondey, Temple Press Aerospace. 1984. . pp. 73-74. To finally close the
Mid-Atlantic gap The Mid-Atlantic gap is a geographical term applied to an undefended area beyond the reach of land-based RAF Coastal Command antisubmarine (A/S) aircraft during the Battle of the Atlantic in the Second World War. It is frequently known as The Bla ...
, or "Black Gap", a space in which Axis submarines could prey of Allied shipping historically out of reach of MPAs, the British
Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) and ...
, the
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...
, and the
US Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...
introduced the American
Consolidated B-24 Liberator The Consolidated B-24 Liberator is an American heavy bomber, designed by Consolidated Aircraft of San Diego, California. It was known within the company as the Model 32, and some initial production aircraft were laid down as export models des ...
bomber A bomber is a military combat aircraft designed to attack ground and naval targets by dropping air-to-ground weaponry (such as bombs), launching aerial torpedo, torpedoes, or deploying air-launched cruise missiles. The first use of bombs dropped ...
, which had a very long
range Range may refer to: Geography * Range (geographic), a chain of hills or mountains; a somewhat linear, complex mountainous or hilly area (cordillera, sierra) ** Mountain range, a group of mountains bordered by lowlands * Range, a term used to i ...
for the era. The B-24 was also used at the basis for the
PB4Y-2 Privateer The Consolidated PB4Y-2 Privateer is an American World War II and Korean War era patrol bomber of the United States Navy derived from the Consolidated B-24 Liberator. The Navy had been using B-24s with only minor modifications as the PB4Y-1 Lib ...
, a dedicated MPA variant adopted in large numbers by the US Navy, which saw service late on in the Pacific theatre. During the conflict, there were several developments in
Air-to-Surface Vessel radar Radar, Air-to-Surface Vessel, or ASV radar for short, is a classification used by the Royal Air Force (RAF) to refer to a series of aircraft-mounted radar systems used to scan the surface of the ocean to locate ships and surfaced submarines. The fi ...
and
sonobuoy A sonobuoy (a portmanteau of sonar and buoy) is a relatively small buoy – typically diameter and long – expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic resea ...
s, which enhanced the ability of aircraft to find and destroy submarines, especially at night and in poor weather.Anonymous, "Ocean's Depth Measured By Radio Robot," ''Popular Mechanics'', December 1938, pp. 828-830.
/ref> Another area of advancement was the adoption of increasingly effective
camouflage Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the leopard's spotted coat, the ...
schemes, which led to the widespread adoption of white paint schemes in the Atlantic to reduce the warning available to surfaced
U-boat U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic warfare role ...
s, while US Navy aircraft transitioned from an upper light blue-gray and lower white to an all-over dark blue due to the increasing threat of Japanese forces at night-time.


Cold War era

In the decades following the Second World War, the MPA missions were partially taken over by aircraft derived from civilian airliners. These had range and performance factors better than most of the wartime bombers. The latest jet-powered bombers of the 1950s did not have the endurance needed for long, overwater patrolling, and they did not have the low loitering speeds necessary for antisubmarine operations. The main threat to NATO maritime supremacy throughout the 1960s, 1970s, and the 1980s was Soviet Navy and
Warsaw Pact The Warsaw Pact (WP) or Treaty of Warsaw, formally the Treaty of Friendship, Cooperation and Mutual Assistance, was a collective defense treaty signed in Warsaw, Poland, between the Soviet Union and seven other Eastern Bloc socialist republic ...
submarines. These were countered by the NATO fleets, the NATO patrol planes mentioned above, and by sophisticated underwater listening systems. These span the so-called "GIUK Gap" of the North Atlantic that extends from Greenland to Iceland, to the
Faroe Islands The Faroe Islands ( ), or simply the Faroes ( fo, Føroyar ; da, Færøerne ), are a North Atlantic island group and an autonomous territory of the Kingdom of Denmark. They are located north-northwest of Scotland, and about halfway bet ...
, to Scotland in the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
. Air bases for NATO patrol planes have also been located in these areas: U.S. Navy and Canadian aircraft based in Greenland, Iceland, and Newfoundland; British aircraft based in Scotland and
Northern Ireland Northern Ireland ( ga, Tuaisceart Éireann ; sco, label= Ulster-Scots, Norlin Airlann) is a part of the United Kingdom, situated in the north-east of the island of Ireland, that is variously described as a country, province or region. Nort ...
; and Norwegian, Dutch, and German aircraft based in their home countries. During the late 1940s, the RAF introduced the
Avro Shackleton The Avro Shackleton is a British long-range maritime patrol aircraft (MPA) which was used by the Royal Air Force (RAF) and the South African Air Force (SAAF). It was developed by Avro from the Avro Lincoln bomber, which itself had been a devel ...
a specialised MPA derivative of the
Avro Lancaster The Avro Lancaster is a British Second World War heavy bomber. It was designed and manufactured by Avro as a contemporary of the Handley Page Halifax, both bombers having been developed to the same specification, as well as the Short Stirlin ...
bomber in anticipation of a rapid expansion of the Soviet Navy's submarine force.Jones 2002, p. 43. An improved model of the Shackleton, the ''MR 3'', was introduced, featuring various structural improvements, along with homing torpedoes and Mk 101 Lulu nuclear depth bombs.''World Aircraft Information Files'' 1997. During the late 1960s, a jet-powered replacement in the form of the
Hawker Siddeley Nimrod The Hawker Siddeley Nimrod is a retired maritime patrol aircraft developed and operated by the United Kingdom. It was an extensive modification of the de Havilland Comet, the world's first operational jet airliner. It was originally designed ...
, a derivation of the
De Havilland Comet The de Havilland DH.106 Comet was the world's first commercial jet airliner. Developed and manufactured by de Havilland in the United Kingdom, the Comet 1 prototype first flew in 1949. It featured an aerodynamically clean design with four d ...
airliner, begun to be introduced. During the 2000s, an improved model, the
BAE Systems Nimrod MRA4 The BAE Systems Nimrod MRA4 was a planned maritime patrol and attack aircraft intended to replace the Hawker Siddeley Nimrod MR2. The rebuilt aircraft would have extended the operating life of the Nimrod fleet by several decades and signific ...
, was in development, but was cancelled and eventually substituted for by the
Boeing P-8 Poseidon The Boeing P-8 Poseidon is an American maritime patrol and reconnaissance aircraft developed and produced by Boeing Defense, Space & Security, and derived from the civilian Boeing 737-800. It was developed for the United States Navy (USN). Th ...
. The U.S. Navy flew a mixture of MPAs, including the land-based
Lockheed P2V Neptune The Lockheed P-2 Neptune (designated P2V by the United States Navy prior to September 1962) is a Maritime patrol aircraft, maritime patrol and anti-submarine warfare (ASW) aircraft. It was developed for the US Navy by Lockheed Corporation, Lockh ...
(P2V) and the
carrier-based Carrier-based aircraft, sometimes known as carrier-capable aircraft or carrier-borne aircraft, are naval aircraft designed for operations from aircraft carriers. They must be able to launch in a short distance and be sturdy enough to withstand ...
Grumman S-2 Tracker The Grumman S-2 Tracker (S2F prior to 1962) was the first purpose-built, single airframe anti-submarine warfare (ASW) aircraft to enter service with the United States Navy. Designed and initially built by Grumman, the Tracker was of conventiona ...
. During the 1970s, the P2V was entirely replaced by the
Lockheed P-3 Orion The Lockheed P-3 Orion is a four-engined, turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner."P-3C."
''history.navy.mil.'' Retrieved: 14 July 2010.
Produced in
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
and
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
, the P-3 has been operated by the air forces and navies of United States, Japan, Canada, Australia, Brazil, Germany, the Netherlands,
New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
,
Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
, Spain, and Taiwan. The Canadian version is called the
CP-140 Aurora The Lockheed CP-140 Aurora is a patrol aircraft, maritime patrol aircraft operated by the Royal Canadian Air Force. The aircraft is based on the Lockheed P-3 Orion airframe, but mounts the electronics suite of the Lockheed S-3 Viking. Aurora ( ...
. During the 1960s, in response to
North Atlantic Treaty Organization The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
(NATO) issuing a Request for Proposals (RFP) for a new MPA, the
Breguet 1150 Atlantic Breguet or Bréguet may refer to: * Breguet (watch), watch manufacturer **Abraham-Louis Breguet (1747–1823), Swiss watchmaker **Louis-François-Clement Breguet (1804–1883), French physicist, watchmaker, electrical and telegraph work * Bréguet ...
was developed by a French-led multinational consortium, ''Société d'Étude et de Construction de Breguet Atlantic'' (SECBAT). Operators of the type include the
French Navy The French Navy (french: Marine nationale, lit=National Navy), informally , is the maritime arm of the French Armed Forces and one of the five military service branches of France. It is among the largest and most powerful naval forces in t ...
, the
German Navy The German Navy (, ) is the navy of Germany and part of the unified ''Bundeswehr'' (Federal Defense), the German Armed Forces. The German Navy was originally known as the ''Bundesmarine'' (Federal Navy) from 1956 to 1995, when ''Deutsche Mari ...
, the
Italian Air Force , colours = , colours_label = , march = (Ordinance March of the Air Force) by Alberto Di Miniello , mascot = , anniversaries = 28 March ...
, the
Pakistan Navy ur, ہمارے لیے اللّٰہ کافی ہے اور وہ بہترین کارساز ہے۔ English language, English: Allah is Sufficient for us - and what an excellent (reliable) Trustee (of affairs) is He!(''Quran, Qur'an, Al Imran, 3:173' ...
, and the
Royal Netherlands Navy The Royal Netherlands Navy ( nl, Koninklijke Marine, links=no) is the naval force of the Kingdom of the Netherlands. During the 17th century, the navy of the Dutch Republic (1581–1795) was one of the most powerful naval forces in the world an ...
. During the 1980s, an updated version, the ''Atlantic Nouvelle Génération'' or ''Atlantique 2'', with new equipment and avionics was introduced, which included a new radar, sonar processor,
forward-looking infrared Forward-looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use a thermographic camera that senses infrared radiation. The sensors installed in forward-looking infrared cameras, as well as those of other thermal ...
camera turret, and the ability to carry the
Exocet The Exocet () is a French-built anti-ship missile whose various versions can be launched from surface vessels, submarines, helicopters and fixed-wing aircraft. Etymology The missile's name was given by M. Guillot, then the technical director ...
anti-shipping missile. By 2005, French manufacturer
Dassault Aviation Dassault Aviation SA () is a French Aerospace manufacturer, manufacturer of military aircraft and business jets. It was founded in 1929 by Marcel Dassault, Marcel Bloch as Société des Avions Marcel Bloch or "MB". After World War II, Marc ...
had decided to terminate marketing efforts for the Atlantic, promoting a MPA variant of the
Dassault Falcon 900 The Dassault Falcon 900, commonly abbreviated as the F900, is a French-built corporate trijet aircraft made by Dassault Aviation. Development The Falcon 900 is a development of the Falcon 50, itself a development of the earlier Falcon 20. Th ...
corporate jet instead."Dassault offers Falcon 900 for maritime patrol."
''Flight International'', 28 June 2005.
Japan has developed multiple purpose-designed MPAs during this period. The
Shin Meiwa PS-1 The Shin Meiwa PS-1 and US-1A is a large STOL aircraft designed for anti-submarine warfare (ASW) and air-sea rescue (SAR) work respectively by Japanese aircraft manufacturer Shin Meiwa. The PS-1 anti-submarine warfare (ASW) variant is a flying ...
flying boat was designed to meet a Japanese requirement for a new ASW platform. A modernised derivative of the PS-1, the
ShinMaywa US-2 The ShinMaywa US-2 is a large Japanese short takeoff and landing amphibious aircraft developed and manufactured by seaplane specialist ShinMaywa (formerly ''Shin Meiwa''). It was developed from the earlier Shin Meiwa US-1A seaplane, which was ...
amphibian, was introduced during the early twenty-first century to succeed the PS-1.Simpson, James
"Japan's defense industry is super excited about this amphibious plane."
''The Week'', 10 September 2015.
Wright, Tim

''Air & Space Magazine'', January 2003.
The land-based
Kawasaki P-1 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 purp ...
was introduced during the 2010s by the
Japan Maritime Self-Defense Force , abbreviated , also simply known as the Japanese Navy, is the maritime warfare branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The JMSDF was formed following the dissolution of the Imperial Japanese Navy (IJN) ...
(JMSDF) as a replacement for the aging
P-3C Orion The Lockheed P-3 Orion is a four-engined, turboprop Anti-submarine warfare, anti-submarine and maritime patrol aircraft, maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed Corporation, Lockh ...
."Sky-High Expectations for Japan's P-X and C-X Aircraft."
''Kawasaki Heavy Industries Scope Quarterly Newsletter'', No.73. October 2007.
Both the
Royal Australian Air Force "Through Adversity to the Stars" , colours = , colours_label = , march = , mascot = , anniversaries = RAAF Anniversary Commemoration ...
and the
Royal Australian Navy The Royal Australian Navy (RAN) is the principal naval force of the Australian Defence Force (ADF). The professional head of the RAN is Chief of Navy (CN) Vice Admiral Mark Hammond AM, RAN. CN is also jointly responsible to the Minister of ...
met their early postwar MPA needs via a stretched-fuselage modification of the
Avro Lincoln The Avro Type 694 Lincoln is a British four-engined heavy bomber, which first flew on 9 June 1944. Developed from the Avro Lancaster, the first Lincoln variants were initially known as the Lancaster IV and V; these were renamed Lincoln I and ...
bomber. However, the type was soon supplemented and eventually replaced by new aircraft, such as the P2V and later the P-3C, which later became the sole ASW type operated by the service. The
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
developed the
Ilyushin Il-38 The Ilyushin Il-38 "Dolphin" ( NATO reporting name: May) is a maritime patrol aircraft and anti-submarine warfare aircraft designed in the Soviet Union. It was a development of the Ilyushin Il-18 turboprop transport. Design and development T ...
from a civilian airliner. Similarly, the
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...
derived the
Canadair CP-107 Argus The Canadair CP-107 Argus (company designation CL-28) is a maritime patrol aircraft designed and manufactured by Canadair for the Royal Canadian Air Force (RCAF). In its early years, the Argus was reputedly the finest anti-submarine patrol bombe ...
from a British airliner, the
Bristol Britannia The Bristol Type 175 Britannia is a retired British medium-to-long-range airliner built by the Bristol Aeroplane Company in 1952 to fly across the Commonwealth. During development two prototypes were lost and the turboprop engines proved sus ...
. The Argus was superseded by the CP-140 Aurora, derived from the Lockheed Electra. Since the end of the
Cold War The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
, the threat of a large-scale submarine attack is a remote one, and many of the air forces and navies have been downsizing their fleets of patrol planes. Those still in service are still used for search-and-rescue, counter-smuggling, anti
piracy Piracy is an act of robbery or criminal violence by ship or boat-borne attackers upon another ship or a coastal area, typically with the goal of stealing cargo and other valuable goods. Those who conduct acts of piracy are called pirates, v ...
, antipoaching of marine life, the enforcement of the exclusive economic zones, and enforcement of the laws of the seas.


Armament and countermeasures

The earliest patrol aircraft carried bombs and machine guns. Between the wars the British experimented with equipping their patrol aircraft with the
COW 37 mm gun The COW 37 mm gun was a British automatic cannon that was developed during First World War as a large-calibre aircraft weapon. It was tested in several installations and specified for the Westland C.O.W. Gun Fighter for attacking bombers. Th ...
. During World War II,
depth charge A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive Shock factor, hydraulic shock. Most depth ...
s that could be set to detonate at specific depths, and later when in proximity with large metal objects replaced "anti-submarine" bombs that detonated on contact. Patrol aircraft also carried defensive armament which was necessary when patrolling areas close to enemy territory such as Allied operations in the
Bay of Biscay The Bay of Biscay (), known in Spain as the Gulf of Biscay ( es, Golfo de Vizcaya, eu, Bizkaiko Golkoa), and in France and some border regions as the Gulf of Gascony (french: Golfe de Gascogne, oc, Golf de Gasconha, br, Pleg-mor Gwaskogn), ...
targeting
U-boats U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic warfare rol ...
starting out from their base. As a result of Allied successes with patrol aircraft against U-boats, the Germans introduced U-''flak'' (submarines equipped with more antiaircraft weaponry) to escort U-boats out of base and encouraged commanders to remain on the surface and fire back at attacking craft rather than trying to escape by diving. However, U-flak was short-lived, as opposing pilots adapted their tactics. Equipping submarines with radar-warning devices and the snorkel made them harder to find. To counter the German long-range patrol aircraft that targeted merchant convoys, the
Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...
introduced the " CAM ship", which was a merchant vessel equipped with a lone
fighter plane Fighter aircraft are fixed-wing military aircraft designed primarily for air-to-air combat. In military conflict, the role of fighter aircraft is to establish air superiority of the battlespace. Domination of the airspace above a battlefield p ...
which could be launched once to engage the enemy planes. Later, the small
escort carrier The escort carrier or escort aircraft carrier (U.S. hull classification symbol CVE), also called a "jeep carrier" or "baby flattop" in the United States Navy (USN) or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft ...
s of WW II became available to cover the deep oceans, and the land air bases in
the Azores ) , motto =( en, "Rather die free than subjected in peace") , anthem= ( en, "Anthem of the Azores") , image_map=Locator_map_of_Azores_in_EU.svg , map_alt=Location of the Azores within the European Union , map_caption=Location of the Azores wi ...
became available in mid-1943 from
Portugal Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ...
.


Sensors

Maritime patrol aircraft are typically fitted with a wide range of sensors:Global Security.com - ASW Sensors
accessdate:March 2014 *
Radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...
to detect surface shipping movements. Radar can also detect a submarine snorkel or periscope, and the wake it creates. *
Magnetic anomaly detector A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field. The term refers specifically to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material crea ...
(MAD) to detect the iron in a submarine's hull. The MAD sensor is typically mounted on an extension from the tail or is trailed behind the aircraft on a cable to minimize interference from the metal in the rest of the aircraft; *
Sonobuoy A sonobuoy (a portmanteau of sonar and buoy) is a relatively small buoy – typically diameter and long – expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic resea ...
s - self-contained sonar transmitter/receivers dropped into the water to transmit data back to the aircraft for analysis; *
ELINT Signals intelligence (SIGINT) is intelligence-gathering by interception of ''signals'', whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication ( ...
sensors to monitor communications and radar emissions; *
Infrared camera Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...
s (sometimes referred to as FLIR for
forward looking infrared Forward-looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use a thermographic camera that senses infrared radiation. The sensors installed in forward-looking infrared cameras, as well as those of other thermal ...
) for detecting exhaust streams and other sources of heat and are useful in monitoring shipping movements and fishing activity. * Visual inspection using the aircrew's eyes, in some cases aided by
searchlight A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direc ...
s or
flare A flare, also sometimes called a fusée, fusee, or bengala in some Latin-speaking countries, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, ...
s. A modern military maritime patrol aircraft typically carries a dozen or so crew members, including relief flight crews, to effectively operate the equipment for 12 hours or more at a time.


Examples


References


Citations


Bibliography

* Andrews, C.F. ''The Vickers Wellington I & II (Aircraft in Profile 125)''. Leatherhead, Surrey: Profile Publications Ltd., 1967. * . * Bridgeman, Leonard. "The Consolidated Vultee Privateer." ''Jane's Fighting Aircraft of World War II.'' London: Studio, 1946.'. * . * Dorr, Robert F. "Variant Briefing: Martin Flying Boats: Mariner, Mars and Marlin". ''Wings of Fame'', Volume 7, 1997, pp. 114–133. London: Aerospace Publishing, . * * (new edition 1987 by Putnam Aeronautical Books, .) * * Swanborough, Gordon and Peter M. Bowers. ''United States Navy aircraft since 1911.'' Naval Institute Press, Annapolis, Maryland (USA) 1990, . * Green, William. ''Famous Bombers of the Second World War''. Garden City, New York: Doubleday & Company, 1975. . * Jarrett, Philip. "Database:The Sopwith 1½ Strutter". ''Aeroplane'', Vol. 37, No, 12, Issue No 440, December 2009, pp. 55–70. London:IPC. ISSN 0143-7240. * Jones, Barry. ''Avro Shackleton''. Crowood Press, 2002. . * Johnson, Brian. ''The Secret War''. London: BBC (British Broadcasting Corporation), 1978. . * Moyes, Philip J. R. ''The Armstrong Whitworth Whitley''. Leatherhead, Surrey, UK: Profile Publications, 1967. * Norris, Geoffrey. ''The Short Sunderland (Aircraft in Profile number 189).'' London: Profile Publications, 1967. * Septer, Dirk. "Canada's Stranraers." ''Aeroplane'', Volume 29, no. 4, issue 235, April 2001. * Thetford, Owen. ''British Naval Aircraft since 1912''. London: Putnam, Fourth edition, 1978. . * * ''World Aircraft Information Files,'' File # 023. London: Bright Star Publishing Ltd, 1997. * Winchester, Jim. "Consolidated B-24 Liberator." ''Aircraft of World War II: The Aviation Factfile''. Hoo, Kent, UK: Grange Books plc, 2004. . {{Military aircraft types (roles) Bomber aircraft Patrol aircraft