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ARP6408 - External Hydraulic Fluid Leakage Definition for Landing Gear Shock Absorbers

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Document Number: ARP6408
Project Initiation: 2016-03-11 12:41:53.0
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Revision Number:
Sponsor Name: Alex Schonfeld
Title
External Hydraulic Fluid Leakage Definition for Landing Gear Shock Absorbers
Scope
<p>The purpose of this SAE Aerospace Recommended Practice (ARP) is to provide a practical definition of external hydraulic fluid leakage exhibited by landing gear shock absorbers/struts. The definition will outline normal (acceptable weepage) and excessive leakage (unacceptable leakage) of shock absorbers/struts that is measurable. The definition of leakage is applicable to new gear assemblies, refurbished/remanufactured (overhauled) shock absorbers/struts, leakage of shock absorbers/struts encountered during acceptance flights, newly delivered and in-service aircraft. This ARP is intended to provide guidelines for acceptable leakage of landing gear shock absorbers/struts between the ambient temperatures of 65 °F (-54 °C) and 130 °F (54 °C) and to outline the procedure for measuring such leakage. The specific limits that are applied to any particular aircraft shall be adjusted by the aircraft manufacturer before inclusion in the applicable maintenance manual.</p>
Rationale
<p>A clear understanding of leakage definition will result in minimizing what is often the unnecessary removal of landing gear shock absorbers from an aircraft. The leakage definitions are intended to assess and control the quality, assembly and proper functioning of landing gear shock absorbers/struts in service.</p>
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