Compressor Section
In the dual axial-flow or "twin spool" compressor system, the first stage turbine drives this part of the compressor.
What is the high-pressure compressor, usually referred to as N2?
Continued and/or excessive heat and centrifugal force is likely to cause turbine blades to lengthen, also known as this term.
What is Creep?
This is considered the hottest point in the engine.
What is the turbine nozzle, or turbine entrance?
Dust and sand in the intake air of a turbine engine will cause this condition to be seen during inspection of a compressor blade.
What is erosion?
Generally, when starting a turbine engine, the starter should be disengaged when the engine has reached this speed.
What is self-accelerating (or self-sustaining)?
In a turbine engine, gas pressures are highest at this point in the engine.
What is the Compressor Outlet? (or Diffuser Inlet)
Turbine blades can generally be grouped into these three design types.
What are Impulse, Reaction, and Impulse-reaction?
These are the three main types of combustion section designs used in aircraft turbine engines.
What is Can, Annular, and Can-Annular?
Manufacturers typically require inspections based on the number of these that have accumulated.
What are hours or cycles?
During engine shutdown, this is the position of the dump valve in a fuel pressurization and dump (P & D) system.
What is open?
These are the two functional elements in a centrifugal compressor.
What are the Impeller and diffuser?
Turbine blades are generally more susceptible to this type of damage due to exposure to high temperatures.
What is cracking or rupture?
This type of combustion chamber requires flame propagation tubes.
What is the Can type?
A cool-off period prior to shutdown of a turbine engine is accomplished in order to cool this component before the case contracts around it.
What is the turbine?
This acronym refers to a complete package for replacing an aircraft engine.
What is QEC?
DAILY DOUBLE$$
These are used in turbine engines to aid in stabilization of compressor airflow during low-thrust engine operation.
What are Variable Inlet Guide Vanes, and/or Variable Stator Vanes, and/or compressor bleed valves?
Turbine nozzle diaphragms, also known as turbine nozzle guide vanes or turbine inlet guide vanes, direct the gas flow onto the turbine blades while also doing this to the gasses.
What is Increase the velocity?
DAILY DOUBLE $$
In a gas turbine engine, combustion occurs at a constant ___________.
What is Pressure?
This is the first engine instrument indication of a successful start of a turbine engine.
What is a rise in exhaust gas temperature (EGT)?
A drawback to this compressor design is higher manufacturing costs.
What is axial flow?
The name of this air, derived from the compressor section, can be equated to a hemorrhage.
What is bleed air?
Components in this area of a turbine engine may NOT be marked with pencils made of wax, grease, or lead.
What is the Hot section?
Hot streaks or hot spots found in a combustion section are indicators that these components are malfunctioning.
What are Fuel Nozzles?
This instrument may be used to accomplish internal inspection of an assembled turbine engine.
What is a Borescope?
These two sets of numbers represent Standard sea level pressure in inches of mercury and in pounds per square inch.
What are 29.92 and 14.7?