5.1 General Safeguards. 5.1.1* Where objects, such as supports, nuts, and bolts, are located such that they might be ingested into an aircraft turbine engine, one of the following criteria shall be met: (1) The objects shall be secured by safety wires, tack welding, adhesive, or approved aircraft-type locking devices. (2) An inlet screen of a design that protects an engine from foreign object damage shall be used. 5.1.2 All materials likely to become exposed to fuels, oils, or hydraulic fuids shall be resistant to deterioration from the fuels being used. 5.2 Drainage Systems. 5.2.1* Drainage systems shall be provided...

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...