SY103 Flashcards
Accessory Compartment contains:
accessory gearbox, starter, oil tank, and battery
Gas Generation section contains:
compressor inlet, compressor, combustion chamber, and compressor turbine
Explain Gas Generation flow
Inlet air enters the engine through the compressor inlet and is compressed by a four-stage axial flow compressor and a single stage centrifugal flow compressor. The compressed air is transferred to the combustion chamber. In the combustion chamber the compressed air is mixed with fuel and ignited. Igniting the mixture causes the gases to expand. The expanding gases drive the compressor turbine, which perpetuates the cycle.
Power Turbine section contains:
power turbines, exhaust case, reduction gearbox, and the propeller shaft
Elements necessary for engine operation
air, fuel, and heat
Engine exhaust system contains
exhaust ports and exhaust stacks
The starter provides
initial air flow
The fuel management unit (FMU) provides
fuel
The ignition system provides
the initial heat source
The ignition system consists of
an ignition exciter, two high voltage igniter cables, and two spark igniters.
PMU automatically maintains
Interstage Turbine Temperature (ITT), torque, and RPM limitations (N1 and NP)
Primary power source for the PMU is the
Permanent Magnet Alternator (PMA), mounted on the reduction gearbox
The PMU is located
underneath the engine, in the accessory compartment
The oil system provides a steady flow of filtered oil to
the engine bearings, reduction gears, accessory drives, and the propeller.
The oil system contains
a pressure system, scavenge system, and cooling system.
The chip detector sensor
detects metallic particles in the oil and warns the pilot of possible gear damage.
Oil level must be serviced within
30 minutes of engine shutdown.
Normal oil pressure
90 to 120 PSI
Aerobatic oil pressure
40 to 130 PSI
Amber Oil PX
PCL-Idle
Oil Pressure between 15 and 40 sec
Time delay: None
Red Oil PX, Amber Oil PX
PCL-Idle
Oil Pressure between 15 and 40 Sec
Time delay: 5 sec or more
Red Oil PX
PCL-Idle
Oil Pressure below 15 sec
Time delay: None
Amber Oil PX
PCL- Above Idle
Oil Pressure between 40 and 90 PSI
Time delay: 10 sec
Red Oil PX
PCL-Above Idle
Oil Pressure 40 PSI or below
Time delay: None
Chip detector sensor is located
in the reduction gearbox
T-6A uses what kind of propellor?
four blade, variable pitch, constant speed propeller.
Reduction gearbox RPM converstion
From 30,000 RPM to 2,000 RPM
Propeller speed (Np) is measured by
phase shift torque probe located in the reduction gearbox.
Propeller blade angle conditions based on
measure of the angle between the plane of rotation of the propeller and the chord line of the blade.
Feathered propeller oil
No oil pressure
Low (flat or fine) propeller oil
Max oil pressure
Propeller Interface Unit (PIU) does what?
responds to power requests from the PMU by regulating oil pressure to the pitch change mechanism. The PIU increases the pressure of the oil accordingly.
Engine cowling does what?
Protects the engine components.
Decreases drag.
Includes an air inlet to the engine.
The purpose of the inertial separator is to
keep debris away from the engine.
What three elements are necessary for engine operation?
Air, fuel, and heat
T or F: Once the engine is started and the ignition switch is on the ON positions, igniters are automatically energized and de-energized by the PMU.
True
The primary purpose of the ignition system is to
ignite the air and fuel mixture in the combustion chamber.
When starting the T-6A, the PCL should be
pushed forward until a green ST READY annunciator is illuminated.
The PMU is located
underneath the engine, in the accessory compartment.
THE PMU performs the following functions
maintains operating limits, processes power requests, and determines available power.
The PMU STATUS annunciator illuminates after landing when the PMU
needs maintenance.
The chip detector sensor is located in
the reduction gearbox.
The phase shift torque probe monitors
propeller speed.
