Exam (elaborations)
T6 PROPULSION SYSTEMS EXAM QUESTIONS AND VERIFIED ANSWERS
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T6 PROPULSION SYSTEMS EXAM QUESTIONS AND VERIFIED ANSWERS....
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What is the function of the propulsion system and what systems does it power -ANSWER Provides thrust for the aircraft
Provides power to aircraft systems like electrical, hydraulic, and fuel pumps
Engine Cowling - ANSWER Metal panels covering engine components
1) Protect components
2) decrease drag
3) Supplies engine with airflow
Purpose of the engine - ANSWER Generate power to turn the propeller to
produce thrust
Three elements necessary for engine operation - ANSWER 1)Compressed air
(provided by starter)
2) Fuel (provided by Fuel Management Unit FMU)
3) Heat (provided by ignition system)
Type of engine - ANSWER Free-turbine, reverse flow design, turboprop
engine
What does free turbine mean? - ANSWER compressor and power turbines are
not physically connected
What does reverse flow design mean? - ANSWER air enters the engine at the
rear and moves forward during combustion cycle
, Major sections of the engine - ANSWER Accessory Compartment (rear
section)
Gas Generation Section (middle section)
Power Turbine Section (front section of engine)
where is the Accessory Compartment located - ANSWER (Major section of
aircraft)
Location: Rear of engine
Gas Generation Section - ANSWER (Major section of aircraft)
Location: Between accessory compartment and the power turbine section
Components: Compressor inlet, compressor, combustion chamber, compressor
turbine
Function: Inlet air enters the engine through the compressor inlet, compressed
by a 4 stage axial flow compressor and single stage centrifugal flow
compressor, the air is then mixed with fuel and ignited in the combustion
chamber, causing the gas to expand which then drives the compressor turbine
Power Turbine Section - ANSWER (Major section of aircraft)
Location: Front section of engine
Components: Power Turbines, exhaust case, reduction gearbox, propeller shaft
Function: Expanding gas passes through the compressor turbine and drives the
power turbines (they rotate in opposite directions AKA free turbine), the gases
flow through exhaust system back to the atmosphere.
The power turbine drives the reduction gearbox, which drives the propellor
shaft at reduced RPM to produce horsepower
Engine Exhaust system - ANSWER Location: exhaust ports located on either
side of engine
Components: Exhaust ports, exhaust stacks
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