Aircraft Bearing Maintenance and Inspection
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Questions and Answers

What is similar to false brinelling, but results from vibration during transport?

  • Brinelling
  • Hydroplaning
  • EHD film formation
  • Shipping or Vibration Brinelling (correct)

    • What is the effect of ambient vibration on a bearing?

  • It causes EHD film to form
  • It increases the bearing's hardness
  • It leads to false brinelling (correct)
  • It prevents false brinelling

    • What is the main difference between brinelling and false brinelling?

  • The duration of vibration
  • The amplitude of vibration
  • The presence of a load exceeding elastic limits (correct)
  • The type of vibration

    • What happens to the corrosion oxide during vibration in false brinelling?

    <p>It is ground into the race by the bearing</p> Signup and view all the answers

    What is a common location to find bearings susceptible to false brinelling?

    <p>In a box on a shelf</p> Signup and view all the answers

    What is the primary purpose of disassembling a component in bearing maintenance?

    <p>To inspect the bearing</p> Signup and view all the answers

    What is the primary cause of galling in bearings?

    <p>Metal-to-metal contact</p> Signup and view all the answers

    What is similar to the deformation caused by brinelling?

    <p>The deformation caused by a Brinell Hardness Tester</p> Signup and view all the answers

    What is the result of metal-to-metal contact in galling?

    <p>Material is transferred from one surface to another</p> Signup and view all the answers

    What type of bearings are typically rejected automatically?

    <p>Split-shell plain bearings</p> Signup and view all the answers

    What is the common cause of flaking in bearings?

    <p>Rolling fatigue</p> Signup and view all the answers

    What is a common visible fault found in bearings during inspection?

    <p>Discoloration due to overheating</p> Signup and view all the answers

    What is the effect of very fine dust particles on bearing wear?

    <p>They accelerate wear of the rings and balls</p> Signup and view all the answers

    What is the relationship between inspection and testing of bearings?

    <p>Inspection and testing go hand in hand</p> Signup and view all the answers

    What is a less visible but serious defect common to bearings?

    <p>Brinelling</p> Signup and view all the answers

    What is the result of hard particles getting into the bearing ringways?

    <p>The ring and ball become rough and coarse</p> Signup and view all the answers

    What is the characteristic of the surface of a bearing that has undergone flaking?

    <p>Rough and coarse</p> Signup and view all the answers

    What is the source of guidance for inspecting aircraft bearings?

    <p>Appropriate maintenance manuals</p> Signup and view all the answers

    What is one of the functions of oil in an engine?

    <p>To act as a cushion between metal parts</p> Signup and view all the answers

    What is the purpose of the oil filtration system?

    <p>To collect foreign matter and deposit it</p> Signup and view all the answers

    What is the most common method of lubricating gears and bearings?

    <p>Splash Lubrication</p> Signup and view all the answers

    What is required for oil-impregnated plain bearings that have been cleaned or machined?

    <p>Re-oiling by vacuum impregnation</p> Signup and view all the answers

    What is the purpose of the pump in a pressure feed lubrication system?

    <p>To lift the oil to the top of the gearbox</p> Signup and view all the answers

    What type of lubricant is applied to some bearings during assembly?

    <p>Dry lubricant</p> Signup and view all the answers

    What is the primary purpose of applying a preservative coating to oil-lubricated bearings during storage?

    <p>To protect them from corrosion and damage</p> Signup and view all the answers

    How long can oil-lubricated bearings be stored with a coating of mineral or synthetic oil?

    <p>30–90 days</p> Signup and view all the answers

    What is done to bearings returning to supply or for overhaul or being prepared for local short-term storage?

    <p>They are lubricated followed by an ‘intimate’ wrapping, then sealing into a heat-sealable plastic bag</p> Signup and view all the answers

    What is required for local storage of bearings?

    <p>A cool, dry area with minimal disturbance</p> Signup and view all the answers

    What information must be included on the container storing bearings?

    <p>Part numbers, stock numbers, name and quantity of bearings, type of preservation, date and place of packing</p> Signup and view all the answers

    What is recommended for storing small bearings?

    <p>They may be expected to operate for their life on their initial oil lubricant</p> Signup and view all the answers

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