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Backup Rings
INSTALLATION - 14018_95

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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durable than leather. Precautions similar to those If unpackaged rings are stored for a long period of applicable to O-rings must be taken to avert time without the use of mandrels, a condition of contamination of backup rings and damage to overlap may develop. To eliminate this condition, hydraulic components. Teflon® backup rings may be stack Teflon® rings in a mandrel of a diameter stocked in individual sealed packages similar to those comparable to the desired diameter of the spiral ring, in which O-rings are packed, or several may be Stack and clamp the rings with their coils flat and installed on a cardboard mandrel. parallel. Then place the rings in an oven at a Figure 2-47.—O-ring installation. 2-36







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