Aircraft Bearing Maintenance and Inspection

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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?

It is ground into the race by the bearing Signup and view all the answers

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

In a box on a shelf Signup and view all the answers

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

To inspect the bearing Signup and view all the answers

What is the primary cause of galling in bearings?

Metal-to-metal contact Signup and view all the answers

What is similar to the deformation caused by brinelling?

The deformation caused by a Brinell Hardness Tester Signup and view all the answers

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

Material is transferred from one surface to another Signup and view all the answers

What type of bearings are typically rejected automatically?

Split-shell plain bearings Signup and view all the answers

What is the common cause of flaking in bearings?

Rolling fatigue Signup and view all the answers

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

Discoloration due to overheating Signup and view all the answers

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

They accelerate wear of the rings and balls Signup and view all the answers

What is the relationship between inspection and testing of bearings?

Inspection and testing go hand in hand Signup and view all the answers

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

Brinelling Signup and view all the answers

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

The ring and ball become rough and coarse Signup and view all the answers

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

Rough and coarse Signup and view all the answers

What is the source of guidance for inspecting aircraft bearings?

Appropriate maintenance manuals Signup and view all the answers

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

To act as a cushion between metal parts Signup and view all the answers

What is the purpose of the oil filtration system?

To collect foreign matter and deposit it Signup and view all the answers

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

Splash Lubrication Signup and view all the answers

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

Re-oiling by vacuum impregnation Signup and view all the answers

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

To lift the oil to the top of the gearbox Signup and view all the answers

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

Dry lubricant Signup and view all the answers

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

To protect them from corrosion and damage Signup and view all the answers

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

30–90 days 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?

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

What is required for local storage of bearings?

A cool, dry area with minimal disturbance Signup and view all the answers

What information must be included on the container storing bearings?

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

What is recommended for storing small bearings?

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