The figures are differential counts, and the NAS class is usually reported as a single figure >5µm. >15µm. >25µm. >50µm. >µm. Size code. A. B. C. D. E. F. 76 SAE AS rev E Table Particle Contamination Level by Class. The SAE aerospace standard (AS) ASD defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting. From this basic distribution, a series of 14 classes was created covering very clean SAE A6 Aerospace panel developed AS for aircraft hydraulic systems. . instance NAS Class 6, can be swapped to AS Class 6B through F.

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Toggle navigation Toggle search. The basis of the code is seen in Table 3. Join your peers on the Internet’s largest technical engineering professional sae as 4059 class 6b-f. The author considers AS to be a significant advance over NAS because it offers many benefits. This concept gives AS much more flexibility than was possible with NAS because it is often the control of the cleanliness level that specifiers require rather sae as 4059 class 6b-f a fixed distribution; for example, they can specify improved control over critical sizes or relax controls over those that are not.

Another aspect that is giving rise for concern is the statement in clause 6. Promoting, selling, recruiting, coursework and thesis posting is forbidden. It was also embarrassing for laboratories involved with contamination testing which often had to explain why there was no traceability and control over the dust. The Eng-Tips staff will check this out and take appropriate action. The reasoning behind this is not entirely clear, but thought to be to separate old and new APC data. Red Sae as 4059 class 6b-f This Post Please let us know here why this post is inappropriate.

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Another criticism of NAS was that there was little guidance on how to use or apply it. APC users are recommended to switch to the new AS standard. One aspect of the change, which may be a little unclear, is that of component cleanliness – the scope sae as 4059 class 6b-f the original NAS document.


Digital transformation may be the most frequently misunderstood and misused term in business discourse today. Equally, sizes that are not critical can be omitted. The accuracy, repeatability and speed of analysis allowed class to be used extensively for research into xlass effects of dirt on components and systems.

Click here sae as 4059 class 6b-f see Table 3. The lack of traceability was a problem in the s as more companies endeavored to achieve ISO type quality systems.

SAE AS E Aerospace Fluid Power – Cleanliness Classification for Hydraulic Fluids_图文_百度文库

NAS can be used for existing systems where correlation with earlier data is necessary. NAS was the forerunner of other contamination coding. I’m guessing it’s equivalent to Nas 6 ISO In Table 3 it can be seen that the particle counts are defined by a number relating to sae as 4059 class 6b-f quantity of particles and a letter relating to the size. This is a result of recent changes to the ISO contamination standards for automatic particle counter APC calibration 3which necessitated the review of NAS and resulted in its withdrawal for newly designed systems.

By joining you are opting in to receive e-mail. There are three reporting options: NAS saw widespread sae as 4059 class 6b-f in the s and s by industries xlass reliability was a prerequisite, in areas such as offshore oil production, iron and steel industries, etc. Few aircraft companies adopted this standard, and very few industrial companies even knew it existed despite the fact that it overcame the deficiencies of NAS There sae as 4059 class 6b-f three reporting options:.

Product innovation is speeding up. Many are specified for analyzing oil samples and presenting data to NAS format for existing designs. Close this window and log in. However, users are encouraged to change to AS as soon as possible so that everyone is 66b-f the same language. No coding system existed at the time for completed systems, so it was logical that it would be applied in this area.

National Aerospace Standard NAS 1 is a particulate contami-nation coding system used in the fluid power industry to simplify the commu- nication of data from particle counters.


It also gave the overseeing-ISO committee the opportunity to obtain traceability for the particle size distribution PSD of the calibration material. As products get more complex, so do the supply clas that build them.

The size distribution was derived in using the optical microscope, so in effect, the APC was set-up to record identical numbers of ACFTD particles as the microscope. Medium-Sized Gear Machining Company. Trending these sizes was fraught with problems and inaccuracies.

The introduction of the APC during the s revolutionized the measurement of the size distribution of dirt particles in a hydraulic system. A praiseworthy step because it should give identical results – in theory.

What Happened to NAS 1638?

This, and the fact that all five of the size ranges were not needed, led to the development of ISO in the early s. Engineering designs that include a high percentage of procured-in components and sub-modules from external companies is the responsibility of a broad product stakeholder network. Addressing Challenges of Online Monitoring.

Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Register now while it’s sae as 4059 class 6b-f free!


The method class counting sae as 4059 class 6b-f particles referenced the optical microscope method defined in ARP 4simply because this was the only method in existence at the time. From this basic distribution, a coass of 14 classes was created covering very clean to very dirty levels, where the interval between each class is double the contamination level. Current Issue Archive Advertise.

Because this situation could cause an uproar within the industry when companies would have to change specifications, the ISO committee decided to take the road of least resistance and selected new size descriptors that would give the same particle counts sqe retaining integer sae as 4059 class 6b-f.

The most significant changes are: Students Click Here Join Us! This principle is a feature of many of the classes that have developed since. Machine Oil Case Study: