This Standard covers the basic requirements for the design, construction, and testing of smooth bore, wire reinforced, polytetrafluoroethylene (PTFE) hose assemblies for use in medium and high pressure fluid systems (except oxygen) in aircraft throughout a temperature range of -55°C to 232°C for medium pressure (Type 1) hoses, and of -55°C to 204°C for high pressure (Types 2 and 3) hoses.

The hose assemblies are classified according to their pressure range and/or weight characteristics as follows:

Type 1A - Medium pressure up to 8750 kPa (87.5 bar) depending on hose size

Type 1B - Medium pressure up to 10 500 kPa (105 bar)

Type 2A - High pressure up to 21 000 kPa (210 bar) , standard weight

Type 2B - High pressure up to 21 000 kPa (210 bar), lightweight

Type 3 - High pressure up to 28 000 kPa (280 bar)

(NOTE: Types 2A and 2B hose assemblies are described for convenience in terms of relative weight. However, it is possible to have hose assemblies conforming to Type 2A dimensions yet as light as equivalent sizes conforming to Type 2B dimensions.)

This Standard also includes the requirements for those hose assemblies which are required to satisfy a specified minimum grade of resistance to fire.

In addition, this Standard includes in annex C the basic requirements for the design, construction, and testing of reinforced PTFE hose (without end fittings) for use in the manufacture of PTFE hose assemblies. Annex C may, therefore, be used as a separate specification to facilitate the supply of hose (inner liner plus reinforcement) from a hose manufacturer to a hose assembly manufacturer or other user.