The combat aircrafts are designed to perform in cold conditions at high altitude field areas with high reliable control systems. The control systems include hydraulic filters operatingin extreme cold conditions. The design ofsophisticated aircraft filters involve strict compliance to the International standards for higher reliability and efficient performance of the hydraulic systems. Generally the glass fibre and stainless steel mesh medias are used in aircraft  hydraulic filters. The hydraulic filters are subjected to high differential pressures during cold environment operating conditions. The present work describes the comparative performance of hydraulic filters with glass fibre and stainless steel mesh under cold environment conditions.