SACAA ATPL(H) Principles of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles of Flight Examination Exam - SACAA ATPL(H) Principles of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles of Flight Examination Exam

Question 1

In the International Standard Atmosphere (ISA) at sea level, what standard temperature and pressure values are used as baseline references for rotorcraft aerodynamic calculations?

+15 °C and 1013.25 hPa 0 °C and 1000.00 hPa +20 °C and 1013.25 hPa +15 °C and 1000.00 hPa

Correct Answer:

+15 °C and 1013.25 hPa

Question 2

How does an increase in density altitude affect main rotor performance and power required to maintain a hover?

Rotor thrust decreases for a given pitch and RPM, requiring higher pitch angles and more engine power to hover Rotor thrust increases due to lower air resistance, reducing required hover power Air density has no effect on rotor lift production, affecting only tail rotor efficiency Rotor profile drag increases significantly while induced power drops to zero

Correct Answer:

Rotor thrust decreases for a given pitch and RPM, requiring higher pitch angles and more engine power to hover

Question 3

What is the aerodynamic difference between blade pitch angle (pitch attitude) and blade angle of attack (AoA)?

Pitch angle is measured between the chord line and the mechanical reference plane, whereas AoA is measured between the chord line and the relative airflow Pitch angle and AoA are identical parameters measured relative to the horizon AoA is fixed mechanically by collective input, while pitch angle varies continuously with induced flow Pitch angle accounts for rotor disc inclination, whereas AoA ignores relative wind velocity

Correct Answer:

Pitch angle is measured between the chord line and the mechanical reference plane, whereas AoA is measured between the chord line and the relative airflow

Question 4

What is induced flow (downwash) in a hovering helicopter, and how does it influence blade angle of attack?

Downward air velocity drawn through the rotor disc that reduces the effective angle of attack for a given mechanical pitch setting Upward flow created by ground reflection that increases the effective angle of attack Horizontal airflow caused by forward airspeed that shifts the lift vector aft Spanwise centrifugal airflow that delays boundary layer separation at the blade tip

Correct Answer:

Downward air velocity drawn through the rotor disc that reduces the effective angle of attack for a given mechanical pitch setting

Question 5

Ground effect (IGE hover) significantly reduces required engine power primarily because:

The proximity of the ground restricts downwash velocity, reducing induced flow and decreasing induced power required Ground cushion increases engine air intake compression, raising turbine shaft power output Tail rotor thrust becomes unnecessary when hovering within one main rotor diameter of the surface Rotor blade parasite drag drops to zero due to surface boundary layer interference

Correct Answer:

The proximity of the ground restricts downwash velocity, reducing induced flow and decreasing induced power required

Question 1

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About this Exam

Prepare with the SACAA ATPL(H) Principles of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles of Flight Examination Exam practice quiz. This question bank includes 100 questions covering rotor, helicopter, main, blade, and power. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SACAA ATPL(H) Principles of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles of Flight Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on rotor, helicopter, main, blade, and power. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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SACAA ATPL(H) Principles of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles of Flight Examination Exam

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