Jet Engines – Bearings, Seals and Oil Consumption

3 Bearing Sumps Sumps are sealed usually by labyrinth seals. Less often carbon seals or brush seals are used. A sump (called a "wet cavity") with labyrinth type seals in hot areas (typically mid-sumps) are usually surrounded by a "dry cavity" that is sealed by a second labyrinth type seal. In this way a double wall design is achieved (Figure 4).

  Consumption, Sump, Oil consumption, Sumps sumps