Airport fire service: ICAO fire categories and crash tenders like the Panther

A yellow or red giant with a roof turret, accelerating across the apron in seconds – airport crash tenders are among the subjects that many spotters only notice on a second look. Yet behind every fire station at an airport lies a fairly precise set of rules. The ICAO fire category determines how much water, foam and dry powder has to be on hand, how many vehicles roll out and how quickly they reach the runway. This guide explains how categories 1 to 10 are determined, which aircraft fall into which level and how to recognize vehicles like the Rosenbauer Panther.

Fire category: the short answer

Every commercial airport is assigned a rescue and firefighting category from 1 to 10. The basis is Annex 14 to the Chicago Convention (ICAO Annex 14), implemented in Europe through EASA’s aerodrome rules. What counts is the largest aircraft that regularly uses the field – rated by overall length and maximum fuselage width. From the category follow minimum quantities of extinguishing agents, discharge rates and the number of fire trucks.

A regional airport with turboprops and A320-class jets gets by with a mid-range category. Anyone regularly handling widebodies such as the Airbus A350-900 needs at least category 9. For the Airbus A380 and the Boeing 747-8, category 10 is required – the highest level.

How the category is calculated

The principle has two steps. First you look at the aircraft’s overall length and find the matching length range. Then you check the fuselage width: each category allows a certain maximum width. If the fuselage is wider, the next higher category applies. The logic behind it: a wider fuselage means a larger area that has to be protected with foam in a fire so that passengers can get out via the escape slides.

Category	Overall length	Max. fuselage width	Typical types (examples)
1	under 9 m	2 m	Light aircraft
2	9 to under 12 m	2 m	Small twin-engine aircraft
3	12 to under 18 m	3 m	Business jets, small turboprops
4	18 to under 24 m	4 m	Larger business jets, regional turboprops
5	24 to under 28 m	4 m	ATR 72
6	28 to under 39 m	5 m	A319, A320, Embraer E190, Dash 8-400
7	39 to under 49 m	5 m	A321, Boeing 737-800, Boeing 757-200
8	49 to under 61 m	7 m	Boeing 787-8, A330-200
9	61 to under 76 m	7 m	A330-300, A350, Boeing 787-9, 777-300ER
10	76 to under 90 m	8 m	Boeing 747-8, Boeing 777-9, A380

The examples come from the manufacturers’ lengths. A few calculations for orientation:

• The Airbus A320 is around 37.6 meters long and thus clearly category 6. The A321, at around 44.5 meters, jumps to category 7 – one reason why the differences within the A320 family also matter for airport operations.
• The Boeing 737-800, at around 39.5 meters, is just above the boundary to category 7, while the shorter 737-700 stays in category 6.
• The Boeing 787-8, at around 57 meters, is category 8, and the stretched 787-9, at just under 63 meters, is already category 9.
• The A380, at just under 73 meters, is shorter than the 747-8. But its fuselage width of a good seven meters exceeds the limit for category 9 – so category 10 applies.

What the category requires in extinguishing agents

With each category the requirements rise markedly. Annex 14 specifies minimum quantities of water for foam production, a discharge rate in liters per minute and a quantity of complementary agents such as dry powder. The values depend on which foam quality the fire service uses; higher-performance foams need less water. For a medium-performance foam, the guideline values look like this:

Category	Water for foam	Discharge rate	Complementary agent	Minimum number of vehicles
1	230 l	230 l/min	45 kg	1
3	1,200 l	900 l/min	135 kg	1
5	5,400 l	3,000 l/min	180 kg	1
6	7,900 l	4,000 l/min	225 kg	2
7	12,100 l	5,300 l/min	225 kg	2
8	18,200 l	7,200 l/min	450 kg	3
9	24,300 l	9,000 l/min	450 kg	3
10	32,300 l	11,200 l/min	450 kg	3

The figures show why large airports work with several vehicles per station: more than 32,000 liters of water don’t fit into any single fire truck. On top of that come reserves of foam concentrate and powder so that refilling can happen quickly after a callout. Also important: there are no hydrants at runways and taxiways. Everything needed at the scene rides along in the tank.

Three minutes: the response time

The second pillar next to the extinguishing agents is time. Under ICAO, no more than three minutes at any point of an operational runway may pass from the alert to the first vehicles beginning to extinguish, and the rules recommend two minutes as the target. It is measured under good visibility and surface conditions.

Behind this figure lies the experience that a jet fuel fire can burn through an aircraft’s fuselage skin within a few minutes. The goal is to keep an escape route open until the passengers are out – not necessarily to extinguish the fire completely right away. This shapes the architecture of large airports: at Frankfurt Airport and Munich Airport, several fire stations are distributed across the grounds so that every runway can be reached within the prescribed time. An airport with a single runway, by contrast, often gets by with one central station.

How important the areas around the runway are for a response is explained in the article on runway safety areas and EMAS. The fire trucks also have to be able to drive where there is no asphalt – on grass, wet ground or in snow.

Upgrades on request and alternate airports

The category is not a fixed value for all eternity. Many smaller airports publish a base category and offer an upgrade on request. Additional personnel and vehicles are then provided for an announced flight. Erfurt-Weimar Airport is an example: it is set up for category 7 and can go to category 9 on request. At Vienna Airport, by contrast, the fire service is permanently set up for category 10 because the A380 lands there regularly.

For airlines, the fire category is a planning criterion. When selecting alternate airports, it counts alongside runway length, weather and opening hours. More on this is in the article Diversion to an alternate airport. For spotters, that means: when a widebody lands unscheduled at a small airport, it’s not only exciting photographically but also a special day for the fire service on site. How to spot such diversions live is described in the guide Spotting diversions.

You can look up the category in the aeronautical information publication (AIP) of the respective country. In the aerodrome part, the rescue and firefighting category is listed under section AD 2.6, often with notes on times or upgrades. How to read the associated charts is explained in Reading AIP aerodrome charts.

Airport crash tenders: engineering to the extreme

An airport crash tender has little in common with an ordinary fire truck. Because it isn’t built for road traffic, it may be wider and heavier – many large vehicles are around three meters wide and weigh well over 30 tonnes, the largest even over 50 tonnes. Typical features:

• Enormous power: Large vehicles often have over 1,000 hp, spread across one or two engines. That lets them accelerate to 80 km/h in around 20 to 30 seconds despite full tanks.
• All-wheel drive: Two, three or four axles, all driven, so the vehicle can make progress beside the runway too.
• Roof turret: A remote-controlled monitor on the cab roof discharges foam even while approaching.
• Front turret and underbody spray nozzles: A turret at the bumper and nozzles under the vehicle protect the vehicle itself when it has to drive through a burning pool.
• Boom: Many modern vehicles have an extendable telescopic boom with a piercing nozzle. The nozzle can penetrate the fuselage skin and deliver extinguishing agent directly inside, for example in a cabin or cargo hold fire.

Besides the big extinguishers, airport fire services deploy fast first-response vehicles, aerial ladders, heavy rescue trucks, command vehicles and vehicles for stairs and rescue platforms. Well-known manufacturers of airport crash tenders besides Rosenbauer include, for example, Oshkosh with the Striker, Ziegler and E-One.

The Rosenbauer Panther up close

No other airport crash tender is seen as often at German-speaking airports as the Panther from the Austrian manufacturer Rosenbauer of Leonding near Linz. It came onto the market in 1991 as the successor to the Simba and has since been built in several generations. Rosenbauer showed the fourth generation in 2015 at the Interschutz trade fair.

Version	Axles	Water (depending on version)	Typical use
Panther 4×4	2	around 6,000 l	Smaller airports, supplement in the response group
Panther 6×6	3	around 9,000 to 12,500 l	Backbone of many mid-size and large airports
Panther 8×8	4	around 12,500 to over 14,000 l	Major airports with category 9 and 10

The exact quantities differ by generation and order, and foam concentrate and, on many vehicles, dry powder come on top. For the fourth-generation 8×8, an acceleration to 80 km/h in around 20 seconds and a top speed of about 140 km/h are cited. With the Panther electric there is also a variant with electric drive, in which a diesel engine charges the batteries as a backup.

How to recognize the Panther

• Cab: The panoramic cab sits far forward and is heavily glazed so the crew can see obstacles directly in front of the vehicle. The fourth generation looks more angular and has slim LED light bars.
• Count the axles: Two, three or four axles tell you the version right away – the simplest type identification at the fence.
• Roof turret or boom: A compact turret on the roof is standard. Vehicles with a boom have a long, folded arm above the body, often with a piercing nozzle at the tip.
• Color: The paint scheme is determined by the operator. In Germany red is common, while many airports worldwide use bright lime yellow.

The airport fire service as a spotter subject

At the airport, the fire service comes in front of your lens in several situations:

For real callouts, a clear rule applies: keep your distance, leave access roads clear and don’t obstruct the emergency crews. What you can and can’t do as a witness is summarized in the article Witnessing an emergency landing or incident. For pictures of injured people, criminal law also has to be considered; more on that under Photos of aviation accidents and emergency landings.

If you’re thinking about a job in this field yourself, the article Working for the airport fire service explains training and daily life.

Conclusion

The fire category is one of an airport’s most important key figures, even though it appears on no departure board. The length and fuselage width of the largest regularly operating aircraft determine the level from 1 to 10, and from it follow water quantities, discharge rates, complementary agents and the number of vehicles. Three minutes to every point of the runway is the upper limit. Vehicles like the Rosenbauer Panther put these requirements on wheels – and are a subject with a charm of its own for spotters.