1.1.1 NFPA 423 establishes the minimum fire safety practices regarding location,construction,services,utilities,fire protection,operation,and maintenance of aircraft engine test facilities. 1.1.2 These facilities include test cells and test stands. 1.1.3 This standard does not apply to engines and engine accessories or to engine test facilities where fuels other than hydrocarbon fuels are used. 1.2 Purpose.The purpose of this standard is to provide aircraft engine test facilities with a reasonable degree of life safety and protection from fire,based on sound engineering principles,test data,and field experience. 3.1 General.The definitions contained in this chapter shall apply to the terms used in this standard.Where terms are...