15.9 lubricants and fuels Flashcards
what is the main task of oil on modern jet engines
- lubrication
- cooling
- cleaning
-corrosion protection
what are the two groups of oil
synthetic
mineral
what are the three types of synthetic oil
type 1 - first generation synthetic,
type 2 - mostly used on modern gas turbine engines
type 3 - higher thermal stability, used on special aircraft ( fighter jets )
what is the advantage of synthetic oil
they have better viscosity, thermal stability and high pressure resistance
what is the disadvantage of synthetic oil
they have a high price
what does the viscosity of oil depend on
the temperature of the oil
what is the flash point
the lowest temperature that the oil will give off enough vapour to flash when flame is applied
what is thermal stability described as
the oils resistance to the decomposition of the oil compounds at high temperatures
what is oil foaming
the measure of resistance of the oil to separate from entrapped air
what is a typical fuel composed of
16% hydrogen and 84% carbon
what are microbes sustained by
fuel and water
what are some of the commonly used additives
anti-oxidants
static dissipator additives
corrosion inhibitors
what provides information of exposure to engine
MSDS
when oils are stored what should they be protected from
extremes of temperature
why should Open containers not be reused
as synthetic oil is hygroscopic and will absorb sufficient moisture from the atmosphere to render it unusable
