What Firefighting Vehicle Level Does an Airport Category Correspond To?

At international airports, rescue and firefighting capability is directly linked to passenger safety. Many people confuse “airport category” with “firefighting category,” yet these are two entirely different standards. This article clarifies the distinction through three key sections.

What Is Airport Category?

What is commonly referred to as “airport category” is more accurately called the Aerodrome Reference Code, as defined by ICAO and set out by SKYbrary (2022) in relevant documents. It is determined primarily by two factors:

• Runway length (represented by numbers 1–4)

• Wingspan and outer main gear wheel span of aircraft that can operate (represented by letters A–F)

Common corresponding relationships are as follows:

The Aerodrome Reference Code determines what size of aircraft an airport can accommodate. It does not directly prescribe how firefighting vehicles should be configured.

What Is the Firefighting Category? Why Is It Not the Same as Airport Category? And What Firefighting Vehicles Does It Correspond To?

The firefighting category is an independent ICAO standard, summarized by SKYbrary (2026) specifically for airport Rescue and Fire Fighting Services (RFFS), ranging from Category 1 to Category 10.

Its classification is based on only one criterion: the overall length + maximum fuselage width of the longest aeroplane normally using the aerodrome.

Why Airport Category ≠ Firefighting Category?

The Aerodrome Reference Code (e.g., 4E, 4F) answers “what aircraft can take off and land,” while the RFF Category (1–10) answers “how strong the firefighting and rescue capability must be.”

It should be noted that there is no fixed one-to-one correspondence between Aerodrome Reference Code 4E and RFF Category. Taking a 4E aerodrome as an example: if the highest-category aeroplanes normally operating at the airport include Category 9 aircraft such as the A350-900, and the number of movements of such passenger aeroplanes reaches or exceeds 700 in the busiest consecutive three months, the RFF level of protection at the airport typically needs to reach the corresponding Category 9. If the number of movements of the highest-category aeroplanes during that period is less than 700, the RFF level of protection may be reduced by one category in accordance with relevant rules of the European Union Aviation Safety Agency (2026).

Therefore, 4E represents the aerodrome infrastructure and aircraft operating conditions, while RFF Category represents the level of protection required for aircraft rescue and firefighting at the aerodrome. Although both are related to aircraft size, their classification purposes and practical applications are different and should not be equated.

Why Do Large International Airports Typically Use ARFF Firefighting Vehicles?

Large international airports generally require a higher level of rescue and firefighting capability. As the RFF category increases, airports require more comprehensive firefighting capabilities, including a greater number of ARFF vehicles, larger firefighting capacities, and more advanced equipment, while maintaining rapid response and sufficient mobility. ARFF airport firefighting vehicles have therefore become a common configuration at major airports. The reasons can be set out in four respects.

Rapid Response

According to the European Union Aviation Safety Agency (2026), in optimum visibility and surface conditions the rescue and firefighting response time shall not exceed three minutes, with an operational objective of reaching any point of each operational runway and commencing discharge within two minutes. ARFF airport firefighting vehicles typically have a maximum speed of about 110–120 km/h, with acceleration from 0 to 80 km/h generally in the mid-20s to around 30 seconds. That performance still needs to be available close to gross weight, so that runways, taxiways and unpaved grassland or soft ground beyond the paved surface can be covered.

Greater Water and Foam Capacity

As the airport RFF category increases, the required firefighting capacity rises significantly. Under ICAO requirements, the minimum available water for foam production increases from 11,800 liters for Category 6 to 18,200 liters for Category 7, 27,300 liters for Category 8, 36,400 liters for Category 9, and 48,200 liters for Category 10. The required complementary dry chemical agent also increases from 225 kg for Categories 6–7 to 450 kg for Categories 8–10. These requirements are not intended to be met by a single vehicle alone. Instead, airports deploy multiple ARFF vehicles with sufficient individual firefighting capacity to provide the required overall volume of extinguishing agents, while ensuring rapid response and continuous firefighting capability.

High-Flow Firefighting Systems

ARFF vehicles are equipped with high-flow firefighting systems designed for rapid and powerful fire suppression. The front-mounted fire pump works together with the large-capacity water tank and roof-mounted monitor to deliver approximately 8,000–10,000 liters of water or foam per minute. This high discharge capacity enables firefighters to quickly attack aircraft fires, cover a large fire area, and maintain effective fire suppression during the critical initial stage of an emergency.

Cab Design and Crew Protection

ARFF vehicles typically feature a wide and relatively low-profile cab design, which is driven by operational requirements rather than styling. A wider and lower body helps keep the vehicle’s center of gravity low, improving stability during high-speed emergency response and maneuvering. It also provides sufficient space for the large-capacity firefighting systems and equipment carried by the vehicle, while offering the crew a wide field of view when approaching an aircraft incident.

Summary

ARFF vehicles are purpose-built to combine rapid response, high firefighting capacity, high-volume discharge, strong off-road mobility, and enhanced crew protection. Together, these capabilities enable ARFF vehicles to reach aircraft incidents quickly, deliver effective initial fire suppression, and support continuous firefighting and rescue operations during the critical early stages of an emergency.

Choosing the right ARFF vehicle depends on the airport’s RFF category, aircraft types, operational environment, and firefighting requirements.

Sources

SKYbrary Aviation Safety. (2022, June 24). ICAO Aerodrome Reference Code. SKYbrary.https://skybrary.aero/articles/icao-aerodrome-reference-code

SKYbrary Aviation Safety. (2026, January 25). Rescue and Fire Fighting Services. SKYbrary. https://skybrary.aero/articles/rescue-and-fire-fighting-services

European Union Aviation Safety Agency. (2026, March 13). Easy Access Rules for Aerodromes (Regulation (EU) No 139/2014). EASA. https://www.easa.europa.eu/en/document-library/easy-access-rules/online-publications/easy-access-rules-aerodromes-regulation-eu