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ASSIGNMENT 3-Cont. - 14018_718
ASSIGNMENT 3-Cont.

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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3-52. What type of rings are used with the MS28775 packing in most modern aircraft with hydraulic system pressures up to 3,000 psi? 1. O-rings 2. U-rings 3. V-rings 4. Backup rings 3-53. O-rings identified by colored dots, dashes, or stripes are only authorized for use on aircraft hydraulic systems that have less than 1,500 psi operating pressure? 1. True 2. False 3-54. O-ring age is computed by what means? 1. From the 2. From the 3. From the 4. From the cure date service life replacement schedules operational conditions 3-55. A torn O-ring package should be secured with which of the following materials? 1. Staples 2. Moistureproof glue 3. Pressure-sensitive, moisture- proof tape 4. Hermetically sealed, heatproof barrier paper 3-56. Which of the following materials should NOT be used to fabricate tools for use in replacing and installing O-rings and backup rings? 1. Wood 2. Steel 3. Brass 4. Phenolic rod 3-57. What method should you use to inspect the inner diameter of an O-ring for cracks? 1. Perform NDI 2. Use a small mirror 3. Roll it onto an inspection cone or dowel 4. Stretch it between two fingers and visually examine it 3-58. 3-59. 3-60. 3-61. 3-62. 3-63. 3-64. When an O-ring installation requires spanning or inserting through sharp threaded areas, ridges, slots, and edges, which of the following devices or procedures should you use? 1. O-ring expanders 2. O-ring entering sleeves 3. A rolling motion of the O-ring 4. Light coating of threads with MIL-S-8802 What are the two types of backup rings used in naval aircraft? 1. Teflon® single and double spiral 2. Leather and polyvinyl 3. O-ring and V-ring 4. Flat and parallel What is the specified shelf life, if any, of Teflon® backup rings? 1. 1 year 2. 2 years 3. 3 years 4. None Teflon® backup rings are identified by which of the following means? 1. Color coding 2. Coded symbols 3. Package labels 4. Visual appearance When you installing Teflon® spiral rings in an internal groove, you must use a right-hand spiral. 1. True 2. False A metallic wiper is installed in what position? 1. The lip facing inward 2. The lip facing outward 3. The groove facing inward 4. The groove facing outward Which of the following protective closures are approved for sealing hydraulic equipment? 1. Metal caps only 2. Metal caps and plugs only 3. Plastic caps and plugs only 4. Plastic or metal caps and plugs 15







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