engines and airframes Flashcards
(38 cards)
what does a turbo/supercharger do
increases altitude at which full power can be maintained
what happens to propellor in loss of oil pressure
single engine - goes closer to fine (becomes fixed-pitch)
multi - full coarse (feather turned on manually)
how does altitude relate to fuel/air mixture
climb = less dense air = richer mixture
descend = more dense air = leaner mixture
What is the main icing hazard for turbocharged engines?
impact ice - visible moisture in air at less than -4 degrees C
below what RPM should a fixed-pitch prop aircraft use the carb heat at all times?
2100RPM
what is throttle ice?
when the throttle is partially closed and at lower power settings, it has the same effect as a venturi, causing the air to speed up and moisture to freeze as a result
what should be done with the mixture when the carb heat is being ran continuously?
The mixture should be leaned (less dense air (hotter) = richer mixture)
advantages of fuel injection system
uniform fuel distribution
more power
better cooling
less icing susceptability
fuel savings
faster throttle response
easier cold start
does an alternator need to provide current at low RPM settings?
yes
4 purposes of engine oil
lubricating
cooling
sealing
cleaning
what are the colors of 80, 100LL, and jet fuels
red, blue, clear
what happens if too high a grade of fuel is used
spark plug fouling
how does a turboprop reverse thrust?
changing propellor pitch
what cases compressor stall
angle of attack of the blades
when a turboprop is operating in the Beta range, the power lever controls
fuel flow and blade pitch
what may indicate abnormally high oil temp
oil level being too low
when will throttle plate icing most likely occur
low power setting and -5 degrees
fuel to air ratio is the
weight of fuel and air entering cylinder
how does a wastegate on a turbocharger reduce manifold pressure
decreasing air compression prior to intake manifold
ignition of mixture due to glowing carbon deposits, not spark plug
pre-ignition
what drives a supercharger’s compressor
gear driven off the prop
what runs supercharger and turbocharger
internal compressor from engine driven and exhaust gas driven
free turbine engine
power turbine and compressor are mechanically free from each other
what does performance do as density altitude increases?
decreases
