What is used to lubricate the landing gear during maintenance?

The lubrication of landing gear during maintenance is specifically done using MIL-PRF-23699 oil or an equivalent product. This type of oil is a designated aviation turbine engine oil that meets specific performance standards and properties required for the effective lubrication of components subjected to a wide range of temperatures and operational stresses, particularly in aircraft systems.

Using the correct type of oil ensures that the landing gear remains free from corrosion and wear while also maintaining proper functionality. MIL-PRF-23699 oil offers excellent lubricating properties, including thermal stability, low volatility, and protection against foaming and oxidation. These characteristics are crucial for the landing gear, which plays a critical role in the safe operation of the aircraft during takeoff and landing.

While engine oil and hydraulic fluid are important for other systems in the aircraft, they do not provide the specific lubrication requirements set forth for landing gear components. Gear oil, although intended for certain mechanical systems, does not meet the aviation standards necessary for the rigors faced by landing gear in flight operations. Hence, MIL-PRF-23699 oil or its equivalent is the appropriate choice for this maintenance task.