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Assignment 4-Cont. - 14020_303
Assignment 4-Cont. - 14020_305

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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ITEMS 4-40 THROUGH 4-45 PERTAIN TO COMMON AIR-CONDITIONING COMPONENTS. 4-40. 4-41. 4-42. 4-43. Which of the following components is used in bleed air ducting to compensate for duct expansion due to high temperatures? 1. Flexible line connectors 2. Marmon clamps 3. Thermal compensators 4. Flexible mounting brackets Which of the following statements is correct concerning the materials bleed air and air- conditioning distribution lines are made of? 1. Air-conditioning lines are made of stainless steel and bleed-air lines of aluminum alloy 2. Air-conditioning and bleed- air lines are both made of stainless steel 3. Bleed-air lines and air- conditioning lines are both made of aluminum alloy 4. Bleed-air lines are made of stainless steel and air- conditioning distribution lines of aluminum alloy Excessive torquing of clamps used in bleed-air air- conditioning systems will cause which of the following results? 1. Sructural loads on the ducting 2. Structural loads on support brackets 3. Structural loads on the clamping devices 4. Ruptures in the system ducting When installing a base between two duct sections, what is the minimum and maximum distance allowed between the duct ends? valve, check clamp for proper position, then retorque to an additional 10 percent of original torque valve Learning Objective: Recognize the components and functions of the cabin cooling and antifog system. 1. 1/8 inch minimum, 1/4 inch maximum 2. 1/8 inch minimum, 3/4 inch maximum 3. 1/4 inch minimum, 1/2 inch maximum 4. 1/4 inch minimum, 3/4 inch maximum 4-44. When installing a hose between two ducts, what is the maximum misalignment allowed between the two duct ends? 1. 1/8 inch 2. 1/4 inch 3. 3/8 inch 4. 1/2 inch 4-45. When installing rigid couplings on ducting, which of the following methods is used to assure proper alignment of the flanges in the couplings? 1. Tighten coupling until gap is completely closed, then back off 1/4 turn on the nut 2. Torque coupling to prescribed torque, tap around coupling with a plastic mallet and retorque to an additional 10 percent of prescribed torque 3. Tighten coupling firmly, tap around outer surface of coupling with a plastic mallet, then tighten coupling to prescribed torque valve 4. Torque coupling to torque ITEMS 4-46 THROUGH 4-52 PERTAIN TO THE CABIN COOLING AND ANTIFOG SYSTEM ON THE F-18 AIRCRAFT. 4-46. When an increase in air temper- ature is desired in the cabin, air is routed through which of the following components? 1. Cabin/defog ram air control valve 2. Cabin add heat valve 3. Cabin flow valve 4. Anti-ice add heat valve 2 6







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