RA 4502 - Wear Debris Monitoring

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Regulatory Article 4502
RA 4502 - Wear Debris Monitoring
Rationale
Any components within an oil-wetted system that are in moving contact will generate
small particles from the contact surfaces, mainly because of local loading between
these surfaces. Excessive friction or abnormal loading of such components will
increase the rate of particle generation and may change the nature of wear debris. It
is therefore important to recognize the onset and significance of such changes in wear
characteristics; such recognition forms the basis of effective wear debris monitoring
(WDM).
Contents
4502(1): Applicability of Wear Debris Monitoring (WDM)
4502(2): Frequency of WDM Sampling
Regulation
4502(1)
4502(2)
Applicability of Wear Debris Monitoring (WDM)
4502(1) Aircraft shall be subject to either one or a combination of the
following WDM techniques:
a. Spectrometric Oil Analysis.
b. Magnetic Detector Plug and filter debris assessment.
Frequency of WDM Sampling
4502(2) The applicable technique(s) shall be promulgated within the
Topic 1.
Acceptable 1.
Means of
Compliance
4502(1)
4502(2)
Acceptable Means of Compliance is contained within MAP Chapter 11.4.
Guidance
Material
4502(1)
4502(2)
2.
Guidance Material and associated processes are contained within MAP Chapter
11.4.
RA 4502 Initial Issue
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Regulatory Article
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RA Initial Issue

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