Abstract: A ring seal assembly 20 is disclosed for reducing leakage about a part, such as a shaft or a piston cylinder having a surface of circular cross section. The assembly includes primary and secondary seal rings 22, 24, having radially inner and outer peripheral surfaces. The primary seal ring includes a radially extending gap 32 which permits the ring to expand. The rings are disposed in aligned, face-to-face contacting relationship, with the secondary seal ring being bonded to the primary seal ring at a point adjacent one side of the gap formed in the primary seal ring. The diameter of the peripheral surface of the primary seal ring, which is adapted to abut the circular surface of the part, substantially conforms to the diameter of the circular surface. The corresponding peripheral surface of the secondary seal ring includes a first portion or dam 40, which is aligned with the gap in the primary seal ring and has a curvature substantially conforming to the curvature of the primary seal ring.

Abstract: An emergency oil/mist system is embodied in the main lubrication system for a bearing or gear box assembly of a gas turbine engine, and includes an auxiliary reservoir interconnected between the main source of pressurized lubricant and an air aspirating nozzle which is capable of either providing a stream of oil to the bearing, or a mist of lubricant to the bearing. A source of pressurized air is connected to the air aspirating nozzle through a control piston valve, and the latter also is provided in a vent line extending between the auxiliary reservoir and the atmosphere. During normal operation of the main lubrication system, the source of pressurized oil is connected through the auxiliary reservoir to the nozzle for providing a stream of lubricant to the bearing.