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Engine Lubrication
O&P(P)
| Question | Answer |
|---|---|
| What is straight mineral oil? | It is the lubricating oil as obtained by fractional distillation of crude oil. It does not have any addatives |
| What is ashless dispersant (AD) oil? | A mineral lubricating oil containing additives that disperse the contaminants throughput the oil so they will not clump and clog oil passages. There are no ash-forming additives in AD oil |
| What is synthetic oil? | A lubricating oil that is made by chemically changing the nature of an oil base to give the needed characteristics. Synthetic oil is the primary oil in turbine engines |
| Is automotive oil suitable for use in aircraft engines? | No, automative oil and aviation oils are formulated for entirely different operating conditions |
| What is meant by a multiviscosity oil? | It is a lubricating oil with a viscosity index improver that increases the viscosity of the oil when it is hot and decreases the viscosity when its cold |
| What are six functions of the oil in an aircraft engine? | Reduce friction; Seals and cushions; Removes heat; Cleans inside of engine; Protects against corrosion; Performs hydraulic action |
| What is the purpose of an air-oil separator, or deaerator, in a turbine engine oil tank? | In normal operation, the oil picks up a quantity of air and it is swirled as it enters the deaerator. The swirling action releases the air from the oil, and the air is used to pressurize the oil tank |
| How is oil pressure regulated in an aircraft engine? | A pressure relief valve senses the desired pressure and sends excess oil back into the engine sump |
| What is the purpose of the restricted orifice in the line between the oil pressure gauge and the engine? | The restricted fitting helps dampen any pulsations in the oil pressure caused by the pump |
| What is a hot tank lubrication system for a turbojet engine? | A lubrication system in which the oil cooler is in the pressure subsystem, and the scavenged oil is not cooled before it is returned to the tank |
| Where does a wet sump oil system store oil | In a reservoir inside the engine |
| What is a cold tank lubrication system for a turbojet engine? | A lubrication system in which the oil cooler is in the scavenge subsystem, and the scavenged oil is cooled before it is returned to the tank |
| Where can you find the grade of engine oil specified for a particular aircraft? | In the airplane flight manual of the pilot's operating handbook for the aircraft |
| Where does a dry sump oil system store oil? | In a reservoir outside the engine through the use of a scavenge pump and external tubing |
| What is the purpose of the chip detector | Magnetic chip detectors are used in the oil system to detect and catch ferrous particles present in the oil. During maintenance, The chip detectors are removed from the engine and inspected for metal. If metal is present, an investigation should be made t |
| What components in a recip engine lubrication system must be inspected on a 100 hour annual inspection | The oil sump and tank, oil strainer screen, the oil filter, the oil cooler and the temp control valve, the oil pressure and temp gauges and any transmitters associated with them, and the entire engine for indication of oil leaks |
| What two instruments show the condition of a recip engine lubrication system | Oil pressure and oil temp gauges |
| What must be done to an oil filter when it is removed from the engine | It should be cut open and the pleated element examined to determine the type and amount of contaminant carried by the oil |
| What is a spectrometric oil analysis program | A program in whic a sample of oil is taken from the engine at regular intervals and sent to a lab, where it is burned in an electric arc. The resulting light is analyzed foe the wavelengths of the elements that are present in the oil sample. Traces of alu |
| What type of oil quantity indicator is used in most aircraft engines | A dipstick that measures the quantity of oil in the tank or sump |
| When should the engine oil quantity be checked on a turbine engine | As soon as practical after the engine is shutdown |
| Where is the oil temp measured on a recip engine | Usually at the oil pressure screen before the oil goes into the engine passages |
| Why do engine manufactures recommend that engine lubricating oil be changed at specific intervals | The oil picks up contaminants and carries them through the engine where they can cause wear, The oil also becomes acidic and causes corrosion in the engine |
| What problem can improper piston ring conditioning (also known as run-in or break-in) lead to | High oil consumption |
| What are causes of high oil consumption in a recip engine | Failing or failed bearing; Worn or broken piston rings; Incorrect installation of piston rings; External oil leakage; Leakage through engine fuel pump vent; Engine breather or vacuum pump breather |
Created by:
tbarth
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