An index is assigned to each FAA Part 139 certificate holder based on a combination of the air carrier aircraft length and the average number of daily departures. If the longest air carrier aircraft at the airport has five or more average daily departures, the matching index is used. If the longest aircraft has less than five average daily departures, the next lower index is used.[1] That index determines the required number of ARFF vehicles and required amount of extinguishing agents.[2]
| Index | Aircraft length | Vehicles | Extinguishing agents |
|---|---|---|---|
| A | <90 ft (<27m) | 1 | either 500 pounds of sodium-based dry chemical, halon 1211, or clean agent; or 450 pounds of potassium-based dry chemical and water with a commensurate quantity of AFFF to total 100 gallons for simultaneous dry chemical and AFFF application. |
| B | 90 ft (27m) to <126 ft (<38m) | 1 | 500 pounds of sodium-based dry chemical, halon 1211, or clean agent and 1,500 gallons of water and the commensurate quantity of AFFF for foam production |
| 2 | one vehicle carrying the extinguishing agents as specified for Index A; and one vehicle carrying an amount of water and the commensurate quantity of AFFF so the total quantity of water for foam production carried by both vehicles is at least 1,500 gallons. | ||
| C | 126 ft (38m) to <159 ft (<48m) | 2 | one vehicle carrying the extinguishing agents as specified for Index B; and one vehicle carrying water and the commensurate quantity of AFFF so the total quantity of water for foam production carried by both vehicles is at least 3,000 gallons |
| 3 | one vehicle carrying the extinguishing agents as specified for Index A; and two vehicles carrying an amount of water and the commensurate quantity of AFFF so the total quantity of water for foam production carried by all three vehicles is at least 3,000 gallons | ||
| D | 159 ft (48m) to <200 ft (<61m) | 3 | one vehicle carrying the extinguishing agents as specified for Index A; and two vehicles carrying an amount of water and the commensurate quantity of AFFF so the total quantity of water for foam production carried by all three vehicles is at least 4,000 gallons |
| E | 200 ft (61m) and longer | 3 | one vehicle carrying the extinguishing agents as specified for Index A; and two vehicles carrying an amount of water and the commensurate quantity of AFFF so the total quantity of water for foam production carried by all three vehicles is at least 6,000 gallons |
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