ACAD2 - SY190 (Systems) Prep v1
Systems 1 (UPT 2.5)
2026-2027
Expert-Verified Questions and
Answers
(With A+ Grades Guarantee)
,This piece protects the engine components, decreases Engine Cowling
drag, and provides an engine air intake.
Causes air molecules to turn 90 degrees to the engine Inertial Separator
compartment, where heavier particles (water or debris)
are not able to make the turn.
What type of engine does the T-6A have? Pratt & Whitney PT6A-68 free turbine, reverse flow design, turboprop engine
Refers to the fact that the compressor and power Free Turbine
turbines are not physically connected.
What three elements are necessary for engine Air, Fuel, and Heat
operation?
What three areas make up the engine compartment? Gas generation section, Power turbine section, and Accessory Compartment
What components make up the gas generation section? Compressor Inlet
Compressor
Combustion Chamber
Compressor Turbine
What causes the power turbine to turn? Expanding gases
True or False: Gases released from the exhaust stacks True
provide a small amount of thrust.
In what switch position does the ignition switch allow the NORM position
PMU to energize/de-energize the igniters as required
during the start sequence?
To find the start position on the PCL, you should push Green "ST READY" light
the PCL forward until you see what annunciation?
Where is the power management unit (PMU) located? Underneath the engine in the accessory compartment
What is the purpose of the PMU? To keep the engine and propeller within operating limits
What does an amber PMU STATUS annunciator light after PMU needs maintenance
landing signify?
What happens to the starter after engine start is Acts as a generator
successfully completed?
, True or False: The MANUAL switch position on the starter False
switch is used under normal engine starting
circumstances.
If the main oil filter gets clogged, what allows unfiltered oil Filter Bypass Valve
to continue lubricating the engine?
What is the purpose of the chip detector sensor, and Detects metallic particles in the oil
where is it located? Located in the reduction box
What annunciator will you see if oil pressure is 15psi Red "OIL PX" lights
or below at IDLE, or 40psi or below above IDLE?
What annunciator will you see if oil pressure remains Both red and amber "OIL PX" lights
between 15-40psi at IDLE power for 5 seconds or more?
What is the purpose of the reduction gearbox? Reduces engine output from 30,000 RPM to propeller operating speed of 2,000
RPM
What is the purpose of the propeller interface unit (PIU)? Regulates oil pressure to the pitch change mechanism
Which propeller position produces the least amount of Feathered
drag?
What does the pitch change mechanism use to change the Oil Pressure
angle of the propeller blades?
What happens to the propeller if there is an engine failure Moves back to feathered
and oil pressure is lost?
What is the purpose of the ignition system? Ignite the air and fuel mixture in the combustion chamber
What monitors propellor speed? (Np) Phase shift torque probe
During aerobatic flight, oil pressure should be at or 40psi
above ______?
Where is the Engine Data Manager (EDM) located? Left avionics bay
In the event of abnormal engine operations, what happens They change color
to the scales on the Primary Engine Data Display (PEDD)?
Systems 1 (UPT 2.5)
2026-2027
Expert-Verified Questions and
Answers
(With A+ Grades Guarantee)
,This piece protects the engine components, decreases Engine Cowling
drag, and provides an engine air intake.
Causes air molecules to turn 90 degrees to the engine Inertial Separator
compartment, where heavier particles (water or debris)
are not able to make the turn.
What type of engine does the T-6A have? Pratt & Whitney PT6A-68 free turbine, reverse flow design, turboprop engine
Refers to the fact that the compressor and power Free Turbine
turbines are not physically connected.
What three elements are necessary for engine Air, Fuel, and Heat
operation?
What three areas make up the engine compartment? Gas generation section, Power turbine section, and Accessory Compartment
What components make up the gas generation section? Compressor Inlet
Compressor
Combustion Chamber
Compressor Turbine
What causes the power turbine to turn? Expanding gases
True or False: Gases released from the exhaust stacks True
provide a small amount of thrust.
In what switch position does the ignition switch allow the NORM position
PMU to energize/de-energize the igniters as required
during the start sequence?
To find the start position on the PCL, you should push Green "ST READY" light
the PCL forward until you see what annunciation?
Where is the power management unit (PMU) located? Underneath the engine in the accessory compartment
What is the purpose of the PMU? To keep the engine and propeller within operating limits
What does an amber PMU STATUS annunciator light after PMU needs maintenance
landing signify?
What happens to the starter after engine start is Acts as a generator
successfully completed?
, True or False: The MANUAL switch position on the starter False
switch is used under normal engine starting
circumstances.
If the main oil filter gets clogged, what allows unfiltered oil Filter Bypass Valve
to continue lubricating the engine?
What is the purpose of the chip detector sensor, and Detects metallic particles in the oil
where is it located? Located in the reduction box
What annunciator will you see if oil pressure is 15psi Red "OIL PX" lights
or below at IDLE, or 40psi or below above IDLE?
What annunciator will you see if oil pressure remains Both red and amber "OIL PX" lights
between 15-40psi at IDLE power for 5 seconds or more?
What is the purpose of the reduction gearbox? Reduces engine output from 30,000 RPM to propeller operating speed of 2,000
RPM
What is the purpose of the propeller interface unit (PIU)? Regulates oil pressure to the pitch change mechanism
Which propeller position produces the least amount of Feathered
drag?
What does the pitch change mechanism use to change the Oil Pressure
angle of the propeller blades?
What happens to the propeller if there is an engine failure Moves back to feathered
and oil pressure is lost?
What is the purpose of the ignition system? Ignite the air and fuel mixture in the combustion chamber
What monitors propellor speed? (Np) Phase shift torque probe
During aerobatic flight, oil pressure should be at or 40psi
above ______?
Where is the Engine Data Manager (EDM) located? Left avionics bay
In the event of abnormal engine operations, what happens They change color
to the scales on the Primary Engine Data Display (PEDD)?
