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MAINTENANCE MANUAL
~.............................................................................. | Hydraulic Fluid, BMS 3-11, Property Limits | | TABLE 601 | ................................................................................ | FLUID | IN-SERVICE | | | PROPERTIES | FLUID LIMITS | TEST PROCEDURE | ................................................................................ |Particulate |NAS 1638, Class 9 *[5] |SAE ARP 598 | |Contamination | | | ................................................................................
|Particle Size |Maximum Number of Particles | |
|Range (Microns) |Allowed | |
| | | |
| 5 to 15 | 128,000 | |
| 15 to 25 | 22,800 | |
| 25 to 50 | 4,050 | |
| 50 to 100 | 720 | |
| Over 100 | 128 | |
2....................…...................................….....................1
*[1] If you think there is contamination, do the procedure in Boeing Document D6-24429, An Analytical Method for Contaminates in BMS 3-11 Fluids and Their Mixtures Using Differential IR Spectroscopy.
*[2] Contamination is a quantity that is more than that in the new fluid. Compare the data from the fluid analysis with the limits put on the new fluid.
*[3] Since the Center system is small, the neutralization number increases faster than the Left and Right systems. It is easier to control neutralization number to 1.5 maximum if you act when neutralization number reaches 0.5. Actions could be draining and refilling the reservoir or complete system flushes, as necessary. Boeing recommends sampling Center system fluid every C-check.
*[4] The precision of | 10 ppm is applicable to total values in the range from 0 to 1000 ppm. In the range from 1000 to 3000 ppm, the precision will decrease to | 50 ppm with some equipment.
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