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POWERPLANT ORALS

CHAPTER 12 - PROPELLERS

QuestionAnswer
WHAT IS THE FUNCTION OF A PROPELLER? THE PROPELLER BLADES CREATE THRUST TO PULL OR PUSH AN AIRPLANE THROUGH THE AIR.
WHAT IS THE DIFFERENCE BETWEEN A FIXED PITCH PROPELLER AND A CONTROLLABLE PITCH PROPELLER? A FIXED PITCH HAS A BUILT-IN BLADE ANGLE THAT CANNOT BE CHANGED BY THE PILOT. A CONTROLLABLE PITCH PROPELLER IS ONE THAT CAN BE CHANGED BY THE PILOT.
HOW ARE SOME WOODEN PROPELLER LADES PROTECTED FROM WEAR AND DAMAGE? BY METAL TIPPING FASTENED TO THE LEADING EDGE AND TIP.
WHAT HAPPENS TO THE BLADE ANGLE OF A CONSTANT SPEED PROPELLER DURING A CONSTANT POWER DIVE? THE BLADE ANGLE INCREASES TO PREVENT AN OVERSPEED.
WHAT ARE THE FUNCTIONS OF A CONSTANT SPEED PROPELLER GOVERNOR? IT BOOSTS ENGINE OIL PRESSURE BEFORE IT ENTERS THE PROPELLER HUB, IT SENSES ROTATIONAL SPEED OF THE PROPELLER, AND THEN ADJUSTS THE OIL FLOW TO THE PROPELLER HUB TO CHANGE PITCH AND, THEREFORE, SPEED OF THE PROPELLER.
WHAT IS THE PURPOSE OF PROPELLER COUNTERWEIGHTS? CENTRIFUGAL FORCE ACTING ON THE COUNTERWEIGHTS CAUSES THE BLADE ANGLE TO INCREASE.
WHAT IS MEANT WHEN A PROPELLER GOVERNOR IS IN AN "ON-SPEED" CONDITION? THE GOVERNOR IS NOT ACCELERATING OR DECELARATING AND THE SPEEDER SPRING AND FLYWEIGHT FORCES ARE IN BALANCE.
HOW IS A CONSTANT SPEED FEATHERING PROPELLER FEATHERED? BY RELEASING OIL PRESSURE IN THE GOVERNOR, THE COUNTERWEIGHTS AND FEATHERING SPRING MOVE THE PROPELLER INTO FEATHER. THIA HAPPENS AUTOMATICALLY IF THE GOVERNOR OIL PRESSURE DROPS TO ZERO, OR CAN BE MANUALLY CONTROLLED BY THE PILOT.
WHAT IS "ALPHA RANGE" AND "BETA RANGE" AND WHERE ARE THEY FOUND? OPERATING MODES OF TURBOPROP REVERSIBLE-PITCH PROPELLERS. ALPHA RANGE , PROPELLER IS OPERATING IN STANDARD, CONSTANT SPEED MODE. (FLIGHT) BETA RANGE, PROP IS OPERATING IN THE ZERO OR MIN THRUST RANGE AND NEGATIVE THRUST OR REVERSE THRUST MODE. (GROUND)
WHAT SYSTEMS ARE COMMONLY USED FOR PROPELLER ICE CONTROL? FLUID (ALCOHOL) AND ELECTRICAL HEAT APPLIED TO THE PROPELLER BLADE ROOT.
WHAT PROPELLER REPAIRS CAN BE PERFROMED BY A CERTIFIED MECHANIC WITH A POWERPLANT RATING? ONLY MINOR REPAIRS AND ALTERATIONS CAN BE PERFORMED BY A CERTIFIED MECHANIC WITH A POWERPLANT RATING. MAJOR REPAIRS MUST BE PERFORMED BY THE MANUFACTURER OR A CERTIFIED REPAIR STATION. THE PROP MANUFACTURER'S MX MANUAL OUTLINES THE SCOPE OF REPAIRS.
HOW ARE WOODEN PROPS GENERALLY CLEANED? WITH A BRUSH OR CLOTH AND WARM WATER WITH MILD SOAP.
WHERE WOULD YOU FIND THE CORRECT METHOD AND TECHNIQUE FOR CLEANING AN ALUMINUM PROP AND HUB? THE PROP MANUFACTURER'S MX INSTRUCTIONS.
WHAT TYPE OF NDT SHOULD BE ACCOMPLISHED TO A PROPELLER AFTER BLENDING? THE PROCEDURES RECOMMENDED BY THE MANUFACTURER'S
WHAT ARE THE TWO CRITERIA USED BY MANY MANUFACTURERS TO DETERMINE THE AMOUNT OF BEND DAMAGE THAT CAN BE REPAIRED BY COLD BENDING OF ALUMINUM PROPS.? THE EXTENT OF THE BEND AND ITS BLADE STATION LOCATION.
HOW CAN REPAIR FILE MARKS BE REMOVED FROM AN ALUMINUM PROP? WITH VERY FINE SANDPAPER.
WHEN PERFORMING A STATIC BALANCE ON A TWO BLADED PROP, WHAT POSITIONS MUST THE PROP BE PLACED IN WHEN MEASUREMENTS ARE TAKEN? VERTICAL AND HORIZONTAL POSITIONS.
WHAT IS A PROP PROTRACTOR USED FOR? IT IS USED TO MEASURE PROP BLADE ANGLE.
WHAT BLADE CONDITIONS CAN CAUSE ENGINE VIBRATION? VIBRATION CAN BE CAUSED BY A PROP BEING OUT OF TRACK AND/OR BALANCE, AS WELL AS INCORRECT BLADE ANGLE SETTING.
WHAT IS BLADE TRACKING? BLADE TRACKING IS A PRROCEDURE THAT COMPARES THE POSITION OF THE PROP BLADE TIPS RELATIVE TO EACH OTHER.
WHAT CONTROLS BOTH MANIFOLD PRESSURE AND RPM ON AN ENGINE EQUIPPED WITTH A FIXED PITCH PROP? THE THROTTLE.
Created by: brookburns34924
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