Module 15.9 Lubricants and Fuels Flashcards
(43 cards)
What are aviation fuel additives?
Compounds added to the fuel in very small quantities
How are additives measured?
Parts per million (ppm)
Name a fuel anti-ice additive?
Prist®
How is anti-ice additive added to fuel?
To bulk fuel and directly into the fuel tank, usually during refuelling.
What do anti-ice additives also inhibit?
Bacterial growth
What must be kept to a minimum in fuel?
Water
When stored, what should synthetic oils be protected against?
High temperatures
What should be checked before use of synthetic oils?
Shelf life
Why should open containers not be reused?
It will absorb sufficient moisture from the atmosphere to make it unusable.
What are the four main tasks of oil?
Lubricating
Cooling
Cleaning
Corrosion protection
What cleans the system from contamination?
Oil
Why is lubrication needed?
To reduce friction between metal surfaces.
Why is cooling needed?
To remove heat in the lubricating areas caused by the operating engine.
What are the two types of oil?
Synthetic oils
Mineral oils
What are the types of synthetic oil?
Type 1, 2 and 3
Which type of synthetic oil is mostly used on modern gas turbine engines?
Type 2
How does type 3 synthetic oil differ from type 2?
Type 3 oil has higher thermal stability and viscosity at high temperatures.
What is viscosity measured in?
Centistokes
What is the viscosity of type 1 synthetic oil?
3 centistokes
What is the viscosity of type 2 synthetic oil?
5 centistokes
What is viscosity index?
The effect temperature has on the viscosity of the oil.
A higher number indicates a viscosity least affected by a change in temperature.
What is the most important characteristic of engine oil?
Viscosity
What is viscosity?
The internal resistance of a fluid against deformation.
What does the viscosity of the oil depend on?
Temperature
