Turbine Engines Flashcards
How are the four strokes of a reciprocating engine similar to the sections of a turbine engine?
Intake=air inlet section
Compression=compressor section
Ignition and power=combustion and turbine section
Exhaust=exhaust section
What type of turbojet engine in commonly used in commercial aviation due to lower noise and better fuel consumption?
High-bypass turbofan engines
What four types of gas turbine engines are used in aircraft?
Turbofan
Turboprop
Turboshaft
Turbojet
What are the two types of turbine compressors?
Centrifugal flow
Axial flow
What is meant by trimming a turbine engine?
Adjusting the fuel control so the engine develops the correct idle and trim speed RPM.
What type of equipment should be used to determine that a turbine engine is performing up to the standards specified by the engine manufacturer?
A JetCal analyzer/trimmer has all of the instrumentation and cables to determine the EGT,EPR, and other parameters specified by the engine manufacturer.
What is meant by a hot-section inspection?
An inspection of the hot section of a turbine engine. The hot section includes the combustors, the turbine, and the exhaust system.
What checks of a turbine engine are necessary to verify preflight conditions?
a. Inspect the cowling and all air inlet areas and attachment of the engine to the airframe.
b. Inspect the inlet guide vanes and the first stage of the compressor or fan blades.
c. Check for unusual noise when the compressor is rotated.
d. Inspect the rear turbine and exhaust system.
e. Check the quantity of the lubricating oil for the engine and the constant-speed drive unit.
f. Check the ignition system for operation by listening for the sparks.
What is meant by on-condition maintenance of a turbine engine?
The monitoring of the engine performance at regular intervals and determining when maintenance is required based on certain operating parameters specified by the engine manufacturer.
What engine instruments are monitored during the start of a turbine engine?
Tachometer
Oil pressure
Internal gas temperatures
What checks are performed after the installation of a turbine eninge?
After starting and idle speed is obtained, the engine should stabilize, and the engine instrument values are monitored. Takeoff thrust is checked by adjusting the throttle to obtain a single, predicted reading on the engine pressure ratio indicator. The manufacturer’s procedures and limitations must be followed during all engine operations. After engine shut down, inspect the engine for fuel and oil leaks and general condition.
What engine fault could cause a turbine engine to have high exhaust gas temperature, low RPM, and high fuel flow at all engine pressure ratio settings?
Possible turbine damage and/or loss of turbine efficiency due to excessive wear.
What would be the indications of an engine bleed-air valve malfunction?
Engine has higher-than-normal exhaust gas temperature during takeoff, climb, and cruise. RPM and fuel flow are higher than normal.
What is the primary purpose of bleeding air off the compressor section?
To unload the compressor at low speed and to control the flow of air to the combustion burners.
What is the secondary purpose or use of bleed air?
Bleed air is used in a variety of aircraft systems including cabin pressurization, heating and cooling, deicing and anti-icing systems, pneumatic starting of engines and auxiliary drive units, and vortex dissipaters.
