SAE ARP6408-2018 PDF

Scope: 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 emanufactured (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 ??(-54 ?? and 130 ??(54 ?? 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. Application This ARP is applicable to all model aircraft and to all in-service aircraft utilizing oleo landing gear shock absorbers. Guidance for acceptable leakage for in-service of aircraft hydraulic components@ excluding shock absorbers/struts@ is governed by ARP1084.

SAE ARP6408-2018 history

2023 SAE ARP6408-2023 External Hydraulic Fluid Leakage Definition for Landing Gear Shock Absorbers
2018 SAE ARP6408-2018 External Hydraulic Fluid Leakage Definition for Landing Gear Shock Absorbers