Originally posted by Mike Day:
Also, Issue E now gives the option of using two systems, Table 1 which is the same as the 'old' NAS 1638 (thge uUS aircraft industry demanded the change!!) and Table 2 which is the same as AS4059 IssueD. The Off Shore industry is standardising on AS4059 so you should use Table 2.
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I have both tables in front of me (AS4059 Table 1 from Rev. D and Table 2 from rev. E) and they have changed. Not much, but enough for us to have to re-wright some software. The particlie limits has gone from nice round figures to more accurate. Why has this been done?
Also I wonder if the method ISO4407 is accepted for microscopy counts (cumulative counts) for the AS4059E? The rev. E contains: 4.2.2 "Method B. Optical Microscope: Optical microscopic counts shall be conducted in accordance with ARP598."
.. Hope you can comment.