Specifications

73
The Navy Standard for Hydraulic Fluids used for aircraft hydraulic systems is de ned in the Aviation
Hydraulics Manual (1989), Table 2-1, Navy Standard for Particulate Cleanliness.
NAVY STANDARD FOR HYDRAULIC FLUIDS – USED FOR AIRCRAFT HYDRAULIC SYSTEMS
Particle Contamination Level by Class
Particle size in μm 0 1 2 3 4 5 6
Number of particles per 100ml
5–10 2,700 4,600 9,700 24,000 32,000 87,000 128,000
10–25 670 1,340 2,680 5,360 10,700 21,400 42,000
25–50 93 210 380 780 1,510 3,150 6,500
50–100 16 28 56 110 225 430 1000
>100 1 3 5 11 21 41 92
NAV AIR 10-1A-17 Table