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Flexible line connectors - 14020_94
Installation of rigid line couplings - 14020_96

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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duct sections, as illustrated in figure 3-7, the gap between the duct ends should be 1/8 inch minimum to 3/4 inch maximum. When install- ing the clamps on the connection, the clamp should be 1/4 inch minimum from the end of the connector. Misalignment between the ducting ends should not exceed 1/8 inch maximum. When installing flexible line connectors, such as the one illustrated in figure 3-8, follow the steps listed below to assure proper installation and security: 1. 2. 3. 4. 5. Fold back half of the sleeve seal and slip it onto the sleeve. Slide the sleeve (with the sleeve seal partially installed) onto the line. Position the split sleeves over the line beads. Slide the sleeve over the split sleeves and fold over the sleeve seal so that it covers the entire sleeve. Install the coupling over the sleeve seal and torque to correct value. NOTE: Torque values for the various sizes and types of couplings maybe found by referring to the applicable MIM. Some couplings will have the correct torque value marked on the outside of the band. When installing rigid line couplings, follow the steps listed below and illustrated in fig- ure 3-9: 1. Slip the V-band coupling over the flanged tube. 2. Place a gasket into one flange. One quick rotary motion assures positive seating of the gasket. 3. Hold the gasket in place with one hand while the mating flanged tube is assembled into the gasket with a series of vertical and horizontal motions to assure the seating of the mating flange to the gasket. NOTE: View B of figure 3-9 illustrates the proper fitting and connecting of a rigid line Figure 3-8.—Installation of flexible line connectors. coupling, using a metal gasket between the ducting flanges. 4. While holding the joint firmly with one hand, install the V-band coupling over the two flanges. 5. Press the coupling tightly around the flanges with one hand while engaging the latch. 6. Tighten the coupling firmly with a ratchet wrench. Tap the outer periphery of the coupling with a plastic mallet to assure proper alignment of the flanges in the coupling. This will seat the sealing edges of the flanges in the gasket. Tighten again, making sure the recommended torque is not exceeded. 7. Check the torque of the coupling with a torque wrench and tighten until the specified torque is obtained. 3-10







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