Operational Requirement
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An Operational Requirement, commonly abbreviated OR, was a
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed. The Guardian' and Telegraph' use Britain as a synonym for the United Kingdom. Some prefer to use Britain as shorth ...

United Kingdom
(UK)
Air Ministry The Air Ministry was a department of the Government of the United Kingdom ga, Rialtas na Ríochta Aontaithe sco, Govrenment o the Unitit Kinrick , image = HM Government logo.svg , image_size=220px, date_established = , state = United ...
document setting out the required characteristics for a future (i.e., as-yet unbuilt)
military aircraft A military aircraft is any fixed-wing A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane An airplane or aeroplane (informally plane) is a fixed-wing aircraft that is propelled forward by thrust from a j ...
or
weapon system#REDIRECT Weapon System Legend for Numeric Designations CL: Lockheed D: Douglas NA: North American WS (Weapon System) Weapon System was a United States Armed Forces The United States Armed Forces are the Military, military forces of the U ...
. The numbered OR would describe what intended role the
aircraft An aircraft is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or by using the Lift (force), dynamic lift of an airfoil, or in ...

aircraft
would be used for, e.g.,
bomber A bomber is a 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 from an ...
,
fighter
fighter
, etc., or what type of
weapon A weapon, arm or armament is any implement or device that can be used with the intent to inflict physical damage or harm. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime, law enforcement, self-defe ...
was required, e.g.,
gun A gun is a ranged weapon A ranged weapon is any weapon A weapon, arm or armament is any implement or device that can be used with the intent to inflict physical damage or harm. Weapons are used to increase the efficacy and efficien ...

gun
,
armament A weapon, arm or armament is any implement or device that can be used with the intent to inflict physical damage or harm. Weapons are used to increase the efficacy and efficiency of activities such as hunting Hunting is the practice of s ...
,
bomb A bomb is an explosive weapon that uses the Exothermic process, exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-tr ...

bomb
type, etc. In conjunction with any official specification, prospective manufacturers would then choose whether to design an aircraft or weapon for this particular requirement. Operational Requirements were carried over with the dissolution of the Air Ministry and the creation of the
Ministry of Defence Ministry of Defence or Ministry of Defense may refer to: * Ministry of defenceMinistry of Defence or Ministry of Defense may refer to: * Ministry of defence, a type of government department responsible for matters of defence Current ministries ...
(MoD).


Other requirements

An Experimental Requirement (ER) was for an aircraft for
research Research is "creative and systematic work undertaken to increase the stock of knowledge". It involves the collection, organization and analysis of information to increase understanding of a topic or issue. A research project may be an expa ...

research
purposes; e.g., ER.100 in support of development of the
English Electric Lightning The English Electric Lightning is a British fighter aircraft Fighter aircraft are fixed-wing A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane An airplane or aeroplane (informally plane) is a fi ...
.


Further reading

*


See also

* List of Operational Requirements for nuclear weapons Cold War military equipment of the United Kingdom United Kingdom defence procurement British military aircraft {{mil-aviation-stub