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Aerospace MRO

Wheels and Landing Gear

While landing gear accounts for only 2.5-5% of an aircraft's maximum take-off weight (MTOW) and just 1.5-1.7% of its overall cost, it represents nearly 20% of lifetime maintenance expenses. This is in part due to the extreme loads during take-off and landing, as well as factors like temperature variations, which cause many components to require frequent servicing.

Maintaining landing gear performance over its lifespan is therefore critical. To support this, Silmid offers a comprehensive range of chemical consumables approved by leading manufacturers, including Safran Landing Systems and UTC Aerospace Systems.

Landing Gear and Shock Strut Fluids

The shock strut cushions the impact during landing by absorbing energy, which helps control vertical oscillations and minimises bounce. The viscosity of oil inside the shock strut helps to dampen the rebound movement.

Silmid offers a wide range of specialised hydraulic fluids engineered to withstand the extreme pressures experienced by landing gear struts during take-off and landing. Available for rapid worldwide delivery, these include the Nyco Hydraunycoil FH 6 AW—approved for both Airbus and Boeing aircraft and suitable for both storage and in-flight use—as well as AeroShell Landing Gear Fluid (LGF), shown to the right.

Shop All Hydraulic Fluids

Wheel and Bearing Greases

Aircraft wheels are typically lightweight and durable, most often manufactured from aluminium alloy, though magnesium alloy wheels are also used in some cases. The wheel bearings inside are specifically engineered to support the aircraft's weight during take-off and landing. Regular servicing of these bearings is essential to prevent issues such as galling, overheating, or other defects that could compromise the aircraft's airworthiness.

Selecting the correct grease options is critical in avoiding such problems. High-performance greases with extreme pressure tolerance, anti-wear protection, and corrosion resistance properties—such as AeroShell Grease 22 and the newer AeroShell Grease 58, shown to the right—are ideal choices for wheel bearing maintenance.

Speciality Cleaners and NDT

Before beginning any overhaul work, it is crucial to thoroughly clean all parts to remove old grease and other contaminants. Specialised products like Ardrox 5503 Solvent Cleaner and Socomore Diestone DLS, shown to the right, are formulated and approved by landing gear OEMs to support this cleaning process.

In addition, Silmid offers a comprehensive range of non-destructive testing (NDT) products, including both Penetrant Testing (PT) and Magnetic Testing (MT) solutions. These products are used to identify any defects in components before the overhaul process begins.

Corrosion Management

Landing gear are among the most robust, durable components of an aircraft, yet their constant exposure to extreme conditions and forces makes them susceptible to corrosion and stress-related damage. Improper maintenance can shorten their operational lifespan and increase overhaul costs.

A variety of greases, lubricants, and specialty compounds are available in a range of formats, to remove existing corrosion and actively help prevent its recurrence. This includes Rocol Aerospec Protect Spay - which is approved by Airbus for use on main landing gear axle sleeves- as well as Socomore Socopac 65H, shown to the right.