T6 General Knowledge questions with correct answers

T6 General Knowledge questions with
correct answers



What is the rated shaft horsepower output of the PT6A-68 engine? - answer-1100 SHP
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What are the two section of the T-6's engine? - answer-Gas generation section
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Power turbine section v v




What components make up the gas generator section of the engine? (aft) - answer-Four
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stage axial flow compressor
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Single-stage centrifugal flow compressor v v v v


Combustion chamber v v


Single stage compressor turbine
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What components make up the Power turbine section? (front) - answer-2 stage axial
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flow power turbine
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Reduction gearbox v




What is the capacity of the oil system? - answer-18.5 quarts
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What components does the oil system supply oil to? - answer-Engine bearings
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Reduction Gears v v


Accessory drives v v


Propeller

What are the components of the oil system? - answer-Pressure system
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Scavenge system v v


Cooling system v v


Breather system v




When must oil be checked and where to get an accurate reading? When must oil be
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serviced? - answer-Check oil 15-20 minute after engine shutdown for the most accurate
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results (using the dipstick and not the sight glass). Service oil within 30 minutes of
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engine shutdown. Oil level should be between ADD and MAX hot. Service to MAX hot if
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at or below ADD.
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When will the amber OIL PX annunciator activate? - answer-PCL at IDLE
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Oil pressure between 15 and 40 psi
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,or v




PCL above IDLE v v


Oil pressure between 40 and 90 psi for 10 seconds
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When will the amber OIL PX and red OIL PX annunciator activate? - answer-PCL at
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IDLE
v v


Oil pressure between 15 and 40 psi for 5 seconds or more
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When will the red OIL PX annunciator activate? - answer-PCL at IDLE
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Oil pressure 15 psi or below
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or

PCL above IDLE v v v


Oil pressure 40 psi or below
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What electrical components are on the Hot Battery Bus? (BEFORE TIME) - answer-
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Battery Switch v v


ELT v


FDR mx light v v v


OBOGS
Ram air v v


Emergency flaps v v


Clock

Engine oil may still display up to what PSI after engine shutdown due to the design of the
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oil pressure transmitter? - answer-4 psi
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What is the function of the reduction gearbox? - answer-To reduce the power turbine
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output from 30,000 RPM to propeller operating speed of 2,000 RPM
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What drives the RGB? - answer-Hot gasses impinging on the 2 stage power turbine
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What does a red CHIP annunciator indicate? - answer-Possible metal contamination in
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the engine oil supply. The CHIP detector is located in the RGB.
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What components are located on the RGB? - answer-Chip detector on the bottom
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PIU, torque probe, PMA mounted on top
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Air conditioning compressor mount on the right
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When should an emergency engine shutdown on the ground be executed? - answer-1.)
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Chip light
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2.)Prop strike v v


3.) Departing a prepared surface
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, 4.) Fire v v


5.) Any other ground emergency where you deem necessary
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The propeller systems is designed to maintain a constant speed of what during most
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flight conditions? - answer-2,000 RPM (100% Np)
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At 100% Np, the engine is producing approximately how many ft lbs of torque at the prop
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shaft? - answer-2,900 ft lbs
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What are the 3 basic condition of propeller pitch? - answer-1.) feathered
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2.) low pitch (flat or fine)
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3.) high pitch
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What is the approximate blade angle of the propeller at low pitch? - answer-15 degrees
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Describe the T6 prop - answer-97 inch, aluminum, four blade, constant speed, variable
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pitch, non-reversing, feathering propeller
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Normally, propeller governing is automatically set by what? - answer-the PMU and PIU
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What happens to the propeller if there is an engine failure with the PCL out of the cut-off
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position? - answer-The prop will slowly begin to feather due to the loss of oil pressure
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but may not reach a fully feathered position
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Power for the feather dump solenoid valve is provided through which circuit breaker? -
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answer-PROP SYS circuit breaker
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How is the pitch of the propeller controlled? - answer-The PMU controls the prop RPM
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by varying blade angles with oil pressure through the PIU.
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With the PMU functioning, the mechanical overspeed governor will modulate oil
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pressure to the prop pitch change piston to limit Np to what? Electronic governing will
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keep Np at what? - answer-106% Np
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100% Np v




If the PMU is not functioning, what will modulate oil pressure to maintain Np at or below
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v100 +/- 2% - answer-Flyweight overspeed governor
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What will happen if the PROP SYS CB is pulled, the PMU is off, and the PCL is placed in
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the cut-off position? - answer-The prop will not rapidly feather and may not fully feather
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until after landing.
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During an auto start or normal procedures with the igniters set to NORM, what will
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energize and de-energize the igniters as required? - answer-PMU
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