New Powerplant Flashcards
What is the most critical lubrication point in a gas turbine engine?
The turbine bearing
Why is an oil tank required to have expansion space?
To provide for thermal expansion and air in the return oil.
Name one type of filter used on aircraft engines
Screen , cuno , canister or spin-on
The basic induction system of an aircraft reciprocating engine consists of what components?
Air scoop used to collect the inlet air,
Ducting that transfer the air to the inlet filter
What are the most common ways to control a waste gate?
Either mechanically with linkages to the throttle,
Or an actuator driven by oil pressure.
What causes fuel evaporation ice ?
By decrease in air temperature resulting from evaporation of fuel after it is introduced into the airstream.
What is the function of the turbocharger waste gate?
Controls the volume of exhaust gases that is directed onto the turbine
What may be the indication of leaking intake pipes?
Engine runs rough
What may be the indication if a turbocharger waste gate will not close fully?
Aircraft can not reach critical altitude
What could be the probable cause of a turbocharger engine that surges?
Waste gate or controller malfunction
What is used on many turbocharged engines for the waste gate actuator power?
Oil pressure
How does a divergent shaped jet engine inlet affect the air flowing to the engine when an airplane is in subsonic flight ?
Air velocity decrease and air pressure increase
Bellmouth inlet ducts are used typically on what type of aircraft ?
Helicopters
Where should cowl flaps be positioned during ground operations?
Fully open
What is the purpose of cowl air seal?
They force air to circulate around and through the baffle system
Where must most cooling air flow to cool a turbine engine ?
inside of the engine
What areas of a turbine engine are cooled by air passing through the engine?
The combustion chamber and turbine
What is the relationship between turbine engine upper temperature limits and power produced?
The higher the combustion temperatures that an engine can withstand without damage. The more power it is capable of producing.
What is the approximate percentage of air passing through a turbine engine that is used for cooling rather than combustion?
75%
What are two general types of exhaust systems in use on reciprocating aircraft engines?
Short stack (open )system and collector system
What material is used to make exhaust system muffler shrouds?
Stainless steel
What drawback in using collector type exhaust systems is more than offset when used on turbocharged engines?
The loss of horsepower due to exhaust system back pressure
Why are turbocharged exhaust system leaking very damaging at high altitudes?
Pressure differential will cause the leak to escape with torchlike intensity
What are the components of a typical turbine exhaust nozzle?
A tail cone, exhaust duct, and support struts
