Name Acronym Description
4x4 Response

A voluntary sector organisation that provides 4x4 vehicles & drivers to support emergency responders and voluntary organisations when road or weather conditions prevent their normal vehicles from operating, or their vehicles or drivers are depleted.

Accelerated controlled

An accelerated controlled burn is a technique, which uses positive pressure to increase temperature of the burn and, therefore, decrease the combustion time.

Access Control Point ACP

Controlled point through which essential non-emergency service personnel may gain access through the outer cordon

ACCess OverLoad Control ACCOLC

Replaced by Mobile Telephone Privileged Access Scheme (MTPAS)

Access point

A location designated for the use of fire and rescue services and provided with facilities to ease an emergency intervention. (for example landside to airside on an airport or to the rail network)


Unplanned, unexpected, unintended and undesirable happening which results in or has the potential for injury, harm, ill-health or damage

Accord européan relatif au
transport international des marchandises Dangereuses par Route

European agreements concerning the international carriage of dangerous goods by road.

Accredited Media

Card carrying member of the National Union of Journalists, or one who has been issued with a pass in connection with a particular incident


A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.


The activation of a mechanism or system


An actuator is a type of motor that is responsible for moving or controlling a mechanism or system. It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. Actuators are commonly used for aircraft controls.


Severe, often dangerous, condition in which relatively rapid changes occur.

Additional personal

Code used in the UK Emergency Action Code list (also known as HAZCHEM) to suggest when gas tight chemical protective clothing may be required.

Aerial fuels

Any fuels found in tree canopies at a height of over 3.5 metres

Aerial Locations Of
Hazardous Atmospheres

Atmospheric dispersion model used for evaluating releases of hazardous chemical vapours.


Means any area of land or water designed, equipped, set apart or commonly used for affording facilities for the landing and departure of aircraft and includes any area or space, whether on the ground, on the roof of a building or elsewhere, for which it is designed.

Aeronautical rescue co-
ordination centre

Royal Air Force facility at Kinloss responsible for the co-ordination of all airborne assets deployed in a rescue operation


A colloidal suspension of liquid or solid particles dispersed in gas having a negligible falling velocity (generally considered to be less than 0.25 m/s).

Affected council

(Local authority guidance term for) Local council requesting mutual aid of another council


1. A generic term, widely used as synonymous with organisation 2. Agencies: collective term often used, especially within Central Government, to describe the
Intelligence Agencies

Agricultural and Food
Countermeasures Working

A group, established in 1997, to involve stakeholders in the development of strategies for managing agricultural land and products following a nuclear accident.

Air Accidents Investigation

An independent organisation embedded within the Department for Transport and responsible for the investigation of civil aircraft accidents and serious incidents within the UK.

Air Ambulance

Aircraft (usually a helicopter) used primarily to transport medical or paramedical staff to the site of an incident or emergency and casualties to specialist trauma centres and/or designated hospitals

Air Consumption Rate
(Notional) – Planning
Guidance Rate/s

An operational safety planning guide appropriate to the rate of air consumption expected for the average BA wearer during operational activity. This guidance figure, along with pre- determined calculations for safety margin and working duration of the cylinder, will ascertain an expected time for the low pressure warning device to operate and provide long-stop planning guidance for the deployment of emergency teams, in the absence of any mitigating information available or arrangements already in place at the entry control point.

Air consumption rate –

The actual rate at which compressed air is used by a BA wearer using self-BA during operational (or training) activity.