201.028 REV 1 Date of Issue: 18 June 2018
11.5 NAS1638 Cleanliness Code System (now defunct, replaced by SAE AS4059E Table 1) ................................. 76
11.6 SAE AS4059 REV E Cleanliness Classification for Hydraulic fluids .................................................................. 76
11.7 Recommendations .......................................................................................................................................... 77
11.8 Hydraulic System Target Cleanliness Levels ................................................................................................... 78
11.9 New ISO Medium Test Dust and its effect on ISO Contamination Control Standards ................................... 79
11.10 Clean Working Practices ............................................................................................................................... 83