M1075 Hydraulic System

NAVAIR 17-15-50.4

TM 38-301-4

T.O. 33-1-37-4

CGTO 33-1-37-4

Trend

Normal

0-13

0-14

0-104

0-89

0-15

0-18

Marginal

14-18

15-20

105-128

90-110

16-18

19-22

High

19-29

20-25

129-160

111-137

19-23

23-28

Abnormal

30+

26+

161+

138+

24+

29+

TECHNICAL INFORMATION

NOTES

General information on the metallurgy of the hydraulic system indicates the metals found in hydraulic systems are Iron (Fe),

Aluminum (Al), Magnesium (Mg), and Copper (Cu).

MIL-PRF-2104 fluid is used for all listed components except for the M1000, which requires a hydraulic fluid.

Additives found in products under MIL-PRF-2104 can contain the following elements: Zn, Mg, Mo, Si, Ca, and B (Ca is not currently

included in the AOAP and is only mentioned as reference). The concentrations can vary depending on the technology used. Only the

element Zn is found all the time at concentrations between 1000-1300 ppm. Si is found between 5-20 ppm. The other elements can

range from 0-600 ppm.

The following elements are not recommended to be monitored/used to determine condition of the system: Ag, Cr, Ni, Sn, Ti, Pb, B,

Mo, and Zn are either not part of the metallurgy of the system (at least in any significance) or the oil contributions would overshadow

any wear limits making monitoring worthless. The problem with elements that are in the oil is that they can change in concentration

from 0 to the maximum range indicated above and therefore significantly affect AOAP limits.