Which of the following are the three main types of propeller balancing?
A) Static, Hydraulic, and Mechanical Balancing
B) Aerodynamic, Static, and Dynamic Balancing
C) Rotational, Vibration, and Aerodynamic Balancing
B) Aerodynamic, Static, and Dynamic Balancing
When is a rotating body said to be in static balance?
A) When its mass is evenly distributed throughout its volume
B) When its centre of gravity lies on the axis of rotation
C) When it rotates without producing aerodynamic drag
B) When its centre of gravity lies on the axis of rotation
Where is static balancing of a propeller typically carried out?
A) On the aircraft during ground runs
B) In flight using onboard monitoring systems
C) Off the aircraft in a controlled environment
C) Off the aircraft in a controlled environment
In static propeller balancing, how is the balance typically checked?
A) Only in the vertical plane
B) Only in the horizontal plane
C) In both horizontal and vertical planes
C) In both horizontal and vertical planes
What is the term for balancing the propeller to reduce the moment of imbalance during rotation?
A) Static balancing
B) Dynamic balancing
C) Aerodynamic balancing
B) Dynamic balancing
Which type of propeller balancing must be performed on a running engine?
A) Static balancing
B) Aerodynamic balancing
C) Dynamic balancing
C) Dynamic balancing
What is eliminated during dynamic propeller balancing?
A) Axial misalignment of the propeller hub
B) Moment of imbalance caused by lateral CG shift
C) Uneven blade surface wear
B) Moment of imbalance caused by lateral CG shift
Which method is commonly used to perform dynamic balancing of a propeller on a running engine?
A) Placing the propeller on a horizontal table and measuring blade length
B) Using a strobe light to measure propeller speed
C) Attaching a vibration pick-up on the engine and adding a defined weight to each blade alternately
C) Attaching a vibration pick-up on the engine and adding a defined weight to each blade alternately
What is the main purpose of aerodynamic balancing in a propeller?
A) To reduce fuel consumption during flight
B) To equalize the weight distribution of each blade
C) To ensure each blade delivers an equal amount of thrust
C) To ensure each blade delivers an equal amount of thrust
What causes vibrations in propellers?
A) Engine speed fluctuations
B) Differing aerodynamic loads due to varying blade angles
C) Changes in air density
B) Differing aerodynamic loads due to varying blade angles
What does the letter ‘T’ indicate when marked on a propeller blade as part of the Aerodynamic Correction Factor (ACF)?
A) Correction for torque
B) Correction for thrust
C) Correction for temperature
B) Correction for thrust
What does the letter ‘Q’ indicate when marked on a propeller blade as part of the Aerodynamic Correction Factor (ACF)?
A) Correction for thrust
B) Correction for torque
C) Correction for quality
B) Correction for torque
What is the purpose of the Universal Blade Protractor?
A) To measure engine RPM
B) To measure the propeller blade angle at a specific blade station
C) To check the balance of the propeller blades
B) To measure the propeller blade angle at a specific blade station
Before measuring the angle of a propeller blade with a Universal Blade Protractor, what must be determined?
A) The engine power setting
B) The reference blade station
C) The pitch control position
B) The reference blade station
What does blade tracking refer to?
A) The ability of blades to change pitch independently
B) The ability of one blade to follow the other in the same plane of rotation
C) The measurement of blade angle at different stations
B) The ability of one blade to follow the other in the same plane of rotation
Why is blade tracking held to reasonable limits?
A) To increase propeller thrust
B) To prevent roughness and vibration
C) To allow easier blade angle adjustment
B) To prevent roughness and vibration
Where is blade tracking measurement usually conducted?
A) At the blade tip
B) At the hub center
C) At the master station
C) At the master station
What are the two main methods for checking blade tracking?
A) Flat Bench Method and Dial Gauge Method
B) Block or Pointer Method and Laser Alignment Method
C) Flat Bench Method and Block or Pointer Method
C) Flat Bench Method and Block or Pointer Method
What does the Flat Bench Tracking Method require?
A) A smooth board placed just under the tip of the lower blade with paper taped to it
B) A laser device to measure blade deflection at the tips
C) A dial gauge attached to each blade root
A) A smooth board placed just under the tip of the lower blade with paper taped to it
When using the Flat Bench Tracking Method, how far apart should the blade tip lines be?
A) No more than 5 mm (3/16 inch)
B) No more than 3 mm (1/8 inch) or as specified in the maintenance manual
C) Exactly 2 mm (1/16 inch) under all conditions
B) No more than 3 mm (1/8 inch) or as specified in the maintenance manual
What is used in the Block or Pointer Tracking Method to check blade alignment?
A) A torque wrench and blade gauge
B) A digital inclinometer attached to the hub
C) A solid object or a pointer fixed near the blade tip
C) A solid object or a pointer fixed near the blade tip
What is true about normal airworthy damage to propeller blades?
A) It always requires immediate blade replacement
B) It compromises the aerodynamic balance significantly
C) It does not affect the flight safety characteristics of the blades
C) It does not affect the flight safety characteristics of the blades
How should an aircraft maintainer determine if propeller blade damage is airworthy or unairworthy?
A) By performing a flight test
B) By consulting the blade repair manual
C) By visually comparing with undamaged blades
B) By consulting the blade repair manual
Where are airworthy damage limits for propeller blades typically found?
A) ATA chapter 24 of the AMM
B) ATA chapter 61 of the AMM
C) ATA chapter 32 of the AMM
B) ATA chapter 61 of the AMM
