GJB 380.8-1998 Contamination test of aircraft hydraulic system using microscope comparison method to determine the solid contamination degree of working fluid (English Version)
2015GJB 380.8A-2015 Aviation working fluid contamination test Part 8: Determination of solid particle contamination by microscopic contrast method
2004GJB 380.8A-2004 Contamination test method of operating fluid for aviation Part 8:Determination of solid particle contamination level by compare method using a microscope
1998GJB 380.8-1998 Contamination test of aircraft hydraulic system using microscope comparison method to determine the solid contamination degree of working fluid