Advisory Circular: Guide Specification for Aircraft Rescue and Fire Fighting Vehicles [open pdf - 192KB]
"This advisory circular (AC) contains information, references and guidelines for a family of aircraft rescue and fire fighting (ARFF) vehicles. Vehicles meeting this standard satisfy Title 14 Code of Federal Regulations (CFR) Part 139, Certification of Airports, and meet the requirements for airport response to aircraft fire fighting." Chapters include: Administration, Definitions, Aircraft Rescue and Fire Fighting Vehicles, Interior Access Vehicle, Acceptance Criteria, Annexes, and Appendices.
United States Federal Aviation Administration: http://www.faa.gov