aircraft system M4 Flashcards
is responsible in cooling the engine, reduce friction in the movable parts of
the engine, cleans, provide seals or coating to the internal engine parts.
oil system
THE ENGINE OIL SYSTEM PERFORMS SEVERAL
IMPORTANT FUNCTIONS:
- Lubrication of the engine’s moving parts
- Cooling of the engine by reducing friction
- Removing heat from the cylinders
- Carrying away contaminants
two types of oil system
wet sump, dry sump
There are two lubrication systems in common use, these are the __ Sump and __
Sump systems.
wet, dry
The system used is normally dependant on the_____ of the
engine, and role of the aircraft.
power output
THE WET AND DRY SUMP LUBRICATING SYSTEMS
The principle of lubrication of the engine is the same
whichever system is used, the principle difference between the two systems being the
method used to store the supply of oil.
Most light, non-aerobatic aircraft engines use the ________ system. In this system the
oil is stored in the bottom or sump of the engine
wet sump
THE WET AND DRY SUMP LUBRICATING SYSTEMS
This simplifies construction but has
number of disadvantages:
✓Lubrication difficulties arise during manueuvers.
✓The temperature of the oil is more difficult to control as it is stored within the hot
engine casing.
✓The oil becomes contaminated and oxidizes more easily because of the continual contact
of the oil with hot engine.
✓The oil supply is limited by the sump capacity.
The system that overcomes the above problems by storing the oil in a remotely
mounted “Tank”.
dry system
It circulates the oil through the engine, and so lubricates the moving
parts.
pressure pump
In a dry sump system, _______then return the oil to the tank to prevent the
engine sumps floodin
Scavenge Pumps
OIL SYSTEM BASIC COMPONENTS
Oil Sump • Oil Strainer • Oil Pumps • Oil Filter • Oil Cooler • Oil Pressure Indicator • Oil Temperature Indicator
It is a bowl-shaped reservoir. It stores the engine oil and then
circulates it within the engine
oil sump
It sits below the crankcase and stores the engine oil when the engine is not running. It is located at the bottom of the engine in order to collect and store the engine oil. v
oil sump
use in checking the oil levels during pre-flight inspection
oil dipstick
Integrated part of the oil sump, It prevents any solid contaminants from entering the oil
system.
oil strainer
is a device which helps to circulate the lubricant oil to all the moving parts
inside the engine.
oil pump
It supplies the oil to oil filter which filters and sends it
onward. The oil then reaches different moving parts of the engine through oil galleries.
oil pump
SOME OF THE ENGINE PARTS WHERE OIL FLOWS
FOR LUBRICATION AND COOLING
- Crankshaft main bearings
- Big end bearings
- Piston pins and small end bushes
- Cylinder walls
- Piston rings
- Timing Gears
- Camshaft and bearings
- Valves
- Tappets and push-rods
- Oil pump parts
In order to get better performance and longer engine life, it is essential that the engine oil
quickly reaches the moving parts of the engine. For this purpose, manufacturers provide ____________ within the engine.
oil galleries
It is nothing but series of interconnected passages which supply the oil to the remotest parts of the engine
oil galleries
It consist of big and small passages drilled inside the cylinder block. The bigger
passages connect to the smaller passages and supply the engine oil up to the cylinder head and overhead camshafts. It also supply the oil to the crankshaft, crankshaft bearings and camshaft bearings thru holes drilled in them as well as to valve lifters/tappets.
oil galleries
screens the contaminants that may have pass the oil strainer preventing them to farther enter the oil system.
oil filter
allows heat exchange between the oil and the engine.
oil cooler
Its function is to tell the pilot that the oil pressure is within operating limits, ensuring the engine is getting the lubrication it needs. Most of it are purely mechanical and do not require electricity to operate.
oil pressure gauges
_________ or Indicator is located in the rear instrument panel in the
cockpit. It receives its data electrically from a sensor located on the engine in
front of the oil filter. This indicates the oil temperature in the engine.
Oil Temperature Gauge
