Turbine Prop Flashcards
Grease reduces the frictional resistance of parts and is easily molded into any form under pressure, this statement defines
Anti friction and Plasticity characteristics of grease
Engine operation at speeds lower than those which the constant speed propeller control can govern in the INCREASE RPM position, the propeller will
Remain in the full low pitch position
Determines oil and grease specification for lubrication of propellers
Propeller manufacturer
Blade tracking is the process of determining
Position of the tips of the propeller blades relative to eachother
Aircrafts propeller system beta range
Is used to produce ZERO or NEGATIVE THRUST
Blades station are measured from the
Hub center line
Counterweights on counter speed propellers are used to aid in
Increase blade angle
During what condition will blade pitch be the greatest
High speed and high altitude cruising flight
Force tend to increase propeller blade angle
Aerodynamic twisting force
How is a propeller in a large aircraft with turbo prop controlled
By the engine power lever
Identified as the cambered or curved side of propeller blade corresponding to the upper surface of a wing
Blade back
How is electrical power for propeller de icer system transferred from the ENGINE to propeller HUB
By slip rings and carbon brushes
Removal of blade tips within type certificate data sheets limits when correcting defects is
A major repair
Blade movement of a feathering propeller that is in the HIGH RPM position when feathering action begun
Low pitch THOUGH HIGH PITCH to feather position
Ice formation on propellers during flight will
Decrease thrust and cause excessive vibrations
Renders and aluminum allow propeller unrepairable
Transverse cracks of any size
Critical ranges are established to avoid
Severe propeller vibrations
Manually feathering a “HYDROMECHANICAL” propeller means to
Port governor oil pressure from the cylinder of the propeller
Surface treatment to counter the effects of dye penetrant inspection on prop is accomplished by
Washing off with solvent
Propeller blade stations increase from
Hub centerline to tip
Nico in aluminum allow propeller blades be repaired soon as possible in order to
Eliminate stress concentration point
Blade angle is the angle between
CHORD OF THE BLADE and the ROTATIONAL PLANE of the PROPELLER
Dye penetrant inspection on prop is accomplished to detect
Cracks and other defects
How is speed of propeller changed during flight
By changing the load tension against the flyweights in the governor
Purpose of permanently sealing and partially filling hubs with dyed oil is to
Make the location of cracks readily apparent
How is anti fluid ejected from the slinger ring on props
By centrifugal force
Geometric pitch of prop is defined as the
Effective pitch plus slippage
Angle of attack of rotating propeller blade is MEASURED between the blade chord or face and
Relative airstream
Propeller governor controls the
Oil to and from the changing pitch mechanism
Reason for careful inspection of minor surface scratches on aluminum allow propellers is to prevent
Fatigue failure
If a flanged propeller shaft has dowel pins
The propeller can be installed in a given position
Advantage of dye penetrant
It shows weather visible lines are cracks rather than scratches
When engine power is increased constant speed propellers tries to function so that it will
Maintain RPM, increase blade angle, maintain low angle of attack
Unit that control the output of the anti icing pump
Rheostat
Thrust produced by rotating propeller is a result of
An area of decreased pressure immediately in front of the propeller blades
Constant speed non feathering, mccauley, hartzell WITHOUT counterweights increase pitch angle using
Oil pressure
Force causes the greatest stress on propeller
Centrifugal force
Force tends to bend propellers forward
Thrust bending force
Synchrophasing system allows pilot to reduce noose and vibration by
Adjusting the PHASE ANGLE between propellers
Centrifugal force acting on a propeller
Is greater than aerodynamic TWISTING force and tends to move the blade to a lower pitch angle
Repairs of nicks in aluminum prop must be made
Parallel to the length of the blade
Purpose of a 3 way propeller valve
Direct oil from the engine oil system to the propeller cylinder
Prepairing blade for inspection shouod be cleaned with
Mild soap and water
Primary purpose of a feathering propeller is to
Eliminate the drag created by a windmilling propeller when an engine fails in flight
How propeller speed governor on a turbo prop engine DECREASES RPM
By allowing oil to escape the propeller hub, driving the blades to an increase blade angle
Propeller aerodynamic “Thrust” imbalance can be largely eliminated by
Correct blade contouring and angle setting
Requires the use of propeller blade station
Measuring blade angle
How steel propeller hub be tested for cracks
By magnetic particle inspection
Function of automatic propeller synchronizing on multi engine is to
To control engine rpm and reduce engine vibration
Actuates pilot valve in the governor of propeller
Governor flyweights
Used to inspect aluminum propeller blade when crack is suspected
Dye penetrant
Distance a propeller moves through the air during one revolution
Effective pitch
Cold straightening an aluminum blade is accomplished by
A appropriately rated repair station or manufacturer
