T-6A Propulsion 1 SY103 Flashcards
(42 cards)
Describe the engine cowling and it’s functions
The metal panels that cover the engine, decreasing drag and providing air intake.
What is the P&W PT6A Free Turbine
This refers to the fact that the compressor and turbines are not physically connected.
Air movement from one turbine to the other provides power to the propeller.
What is Reverse Flow
When air enters the engine at the rear and moves foreword during the combustion process.
What 3 elements are necessary for engine operation
Air
Fuel
Heat
What are the 3 major sections of the engine
Accessory compartment, gas generation section, power turbine section
Gas Generation Section Location and components
-Located between accessory compartment & power turbine section- Compressor inlet Compressor Combustion chamber Compressor turbine
Gas Generation Functions 1
Air enters engine via compressor inlet, compressed by four-stage axial flow compressor and single-stage centrifugal flow compressor
Gas generation functions 2
Compressed air transferred to combustion chamber, compressed air mixed with furs and ignited, ignited mixture expands, expanded gassed drive compressor turbine, this perpetuates the cycle
Power turbine location and components
-locates on the front section- Power turbines Exhaust case Reduction gearbox Propeller shaft
Exhaust components
Exhaust ports
Exhaust stacks
Exhaust purpose and location
-located on either side of the engine-
Gassed released rearward into the atmosphere providing small amount of additional thrust
Ignition system type and purpose
Type: dual ignition
Starter provides airflow, FMU provides fuel, ignition system produces heat source
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PENIS
Ignition location and components
-ignition exciter mounted on the airframe-
Ignition exciter
2 high voltage igniter cables
2 spark igniters
An ignited cable runs from exciter to each igniter. Igniters locates at 4 and 9 o’clock positions around combustion chamber
Ignition control switch 1 location and positions
-located on right foreword switch panel in each cockpit-
Positions:
On
Norm
Power Control Lever (PCL) location and purpose
-located on left console panel in both cockpits-
Controls fuel flow to the engine, producing torque to the engine, thus controlling engine power and aircraft speed
How are PCLs connected
Front and rear PCLs are interconnected with a push-pull rod, providing identical control
PCL positions 1
Max
Idle
Off (aft most position, used for shutdown)
PMU location and purpose
-Located underneath the engine in the accessory compartment-
Processes power requests from PCL, primary function is to keep propeller within operating limits.
PMU Switch 1 positions and location
-located on the right foreword switch panel-
Norm
Off
When I’m Norm, all PMU functions are active
PMU switch 2
With PMU in off position (or if PMU Fails) all system limitation must be monitored manually
PMU Status Indicators
Amber PMU STATUS: illuminates after landing so maintenance can be alerted the PMU has accommodated a fault.
PMU Status light in flight: Indicates in either of, or mismatched between the weight-on-wheels switches (the PMU will not revert to the ground mode upon landing)
PMU Fail Indicators
PMU FAIL Is the second annunciator and is red. Indicates that the PMU is Non-functional
Accompanied by the illumination of the PMU STATUS indicator
MASTER WARN and MASTER CAUT lights flash and aural tone is heard
PMU Power
The primary source of power comes from PMA (Primary Magnet Alternator, mounted on reduction gearbox)
PMA provides 32 VAC, which the PMU converts to DC. If PMA fails, power is provided through 28 VDC battery bus
