What is the function of metering pins in oleo shock struts?

The function of metering pins in oleo shock struts is to control the flow of oil during compression. This mechanism is crucial for managing the damping characteristics of the shock strut system. When the strut is compressed, the metering pins help regulate the amount of hydraulic fluid that moves through the strut. By doing so, they ensure that the strut can effectively absorb and dissipate the energy generated by landing impacts or surface irregularities while providing a smooth and controlled ride.

By controlling the flow of oil, metering pins prevent the strut from compressing too quickly, which could lead to a rough landing and inadequate shock absorption. This regulation also plays a vital role in maintaining the right level of resistance during extension, allowing the shock strut to return to its original position smoothly.

Understanding this function is essential for comprehending how oleo shock struts operate and the overall dynamics of an aircraft's landing gear system, particularly in terms of stability and comfort during landings.