100+ Free SACAA PPL Principles of Flight Practice Questions

Pass your SACAA Private Pilot Licence (Aeroplane) Principles of Flight Theoretical Knowledge Examination exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More SACAA Pilot Licence Theory Subjects (South Africa)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

SACAA PPL General Navigation Exam

Practice Questions100 questions

SACAA PPL Human Performance & Limitations Exam

Practice Questions100 questions

Sample SACAA PPL Principles of Flight Practice Questions

Try these sample questions to test your SACAA PPL Principles of Flight exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the International Standard Atmosphere (ISA), what are the sea-level temperature and pressure used as the reference?

A.15 °C and 1013.25 hPa

B.0 °C and 1000 hPa

C.20 °C and 1013.25 hPa

D.15 °C and 29.92 hPa

Explanation: ISA sea-level conditions are 15 °C and 1013.25 hPa (29.92 inHg). These values define the standard datum used for performance and altimetry comparisons.

2As altitude increases in the troposphere under ISA conditions, what generally happens to air density?

A.It decreases

B.It remains constant

C.It increases

D.It doubles every 1000 ft

Explanation: Pressure and temperature both fall with altitude in the troposphere, and air density decreases. Lower density reduces engine power, propeller thrust, and aerodynamic force for a given TAS.

3Density altitude is best described as:

A.Pressure altitude corrected for non-standard temperature (and humidity effects where considered)

B.True altitude above mean sea level

C.Indicated altitude with QNH set

D.Flight level always equal to pressure altitude

Explanation: Density altitude is the altitude in the standard atmosphere corresponding to the ambient density. It is commonly obtained from pressure altitude adjusted for temperature (and humidity when considered), and it drives performance.

4If temperature increases while pressure altitude stays the same, what happens to air density?

A.Density decreases

B.Density increases

C.Density is unchanged

D.Density becomes equal to ISA density

Explanation: At a given pressure, warmer air is less dense. Higher than ISA temperatures at a given pressure altitude raise density altitude and reduce aerodynamic and engine performance.

5Approximate ISA temperature lapse rate in the troposphere is closest to:

A.2 °C per 1000 ft

B.10 °C per 1000 ft

C.1 °C per 100 ft

D.5 °C per 1000 m only, never per 1000 ft

Explanation: ISA tropospheric lapse rate is about 1.98 °C per 1000 ft (≈6.5 °C/km). Pilots commonly use ≈2 °C/1000 ft for PPL calculations.

6Compared with dry air at the same pressure and temperature, humid air is:

A.Less dense

B.Denser

C.Identical in density

D.Always colder

Explanation: Water vapour has a lower molecular weight than dry air. At the same pressure and temperature, moist air is slightly less dense, which can slightly raise density altitude.

7The two main gases in the atmosphere by volume are approximately:

A.Nitrogen ≈78% and oxygen ≈21%

B.Oxygen ≈78% and nitrogen ≈21%

C.Carbon dioxide ≈78% and oxygen ≈21%

D.Nitrogen ≈50% and oxygen ≈50%

Explanation: Dry air is roughly 78% nitrogen and 21% oxygen, with argon and other gases making up the remainder. Carbon dioxide is only a small fraction by volume.

8Pressure altitude is the altitude indicated when the altimeter subscale is set to:

A.1013.25 hPa (standard pressure)

B.Local QFE

C.Local QNH always

D.Field elevation in feet

Explanation: Pressure altitude is height above the standard datum plane of 1013.25 hPa. Setting 1013.25 hPa on the altimeter gives pressure altitude (used for flight levels and performance charts).

9In a venturi, as airflow speeds up through the constriction, static pressure:

A.Decreases

B.Increases

C.Remains exactly equal to total pressure

D.Becomes equal to dynamic pressure

Explanation: Bernoulli’s principle (for incompressible flow along a streamline) links higher speed with lower static pressure. The venturi demonstrates the same relationship used in explaining lift.

10Angle of attack is the angle between the:

A.Chord line and the relative airflow

B.Longitudinal axis and the horizon

C.Wing span and the relative airflow

D.Thrust line and the chord line

Explanation: Angle of attack (α) is measured between the aerofoil chord line and the relative airflow (free-stream direction).

About the SACAA PPL Principles of Flight Exam

The SACAA PPL Principles of Flight examination is a mandatory computer-based theoretical knowledge subject for the South African Private Pilot Licence (Aeroplane). It tests aerodynamics and flight mechanics from the official PPL Combined Syllabus §11: atmosphere/ISA, lift and aerofoils, drag and thrust, flying controls and high-lift devices, straight-and-level/climb/descent/turning, stalls and spin avoidance, stability, and load-factor/structural limits.

Questions

30 scored questions

Time Limit

45 minutes

Passing Score

75%

Exam Fee

~R425–R450 per subject (confirm current SACAA Part 187 fee; ATO invigilation may add charges) (South African Civil Aviation Authority (SACAA))

SACAA PPL Principles of Flight Exam Content Outline

Atmosphere

Composition and structure, ISA, atmospheric pressure, density, pressure and density altitude.

15%

Lift and Aerofoils

Bernoulli/Newton, aerofoil geometry, AoA, CL, lift formula, IAS/TAS, centre of pressure, lift curve.

10%

Drag

Parasite and induced drag, total drag curve, L/D ratio, aspect ratio and planform effects.

Thrust and Propeller

Propeller as an aerofoil, thrust force, thrust vs speed, density-altitude effects on thrust.

14%

Flight Controls and High-Lift Devices

Axes and primary controls, adverse yaw, trim tabs, flaps/slats, control effectiveness, mass balance.

16%

Flight Mechanics

Straight-and-level, climb (Vx/Vy), glide/descent, turning, load factor, range/endurance concepts.

14%

Stalls and Spins

Critical AoA, stall factors and recovery, washout, incipient spin recognition and avoidance.

Stability

Static and dynamic stability; longitudinal, lateral and directional stability; CG and spiral dive.

Load Factor and Structure

Limit/ultimate loads, Va, V–n envelope, gusts, flap load limits, landing-gear side loads.

How to Pass the SACAA PPL Principles of Flight Exam

What You Need to Know

Passing score: 75%
Exam length: 30 questions
Time limit: 45 minutes
Exam fee: ~R425–R450 per subject (confirm current SACAA Part 187 fee; ATO invigilation may add charges)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

SACAA PPL Principles of Flight Study Tips from Top Performers

1Memorise ISA sea-level values (15 °C, 1013.25 hPa) and that density falls with altitude/temperature — performance follows density altitude.

2Drill the lift equation L = ½ ρ V² S CL and that stall is an angle-of-attack event, not a fixed airspeed in all conditions.

3Know parasite vs induced drag: induced dominates slow/high-CL flight; parasite dominates fast flight; L/D max is near where they meet.

4Practise turn maths: n = 1/cos(φ); at 60° bank n = 2 and stall speed rises by √2.

5Link stability to CG: aft CG reduces longitudinal stability and can limit elevator authority for stall recovery — a high-risk loading error.

Frequently Asked Questions

What is the pass mark for the SACAA PPL Principles of Flight exam?

CAR 61.01.10 sets the pass mark for SACAA theoretical knowledge examinations at 75%. There is no negative marking, so unanswered questions should still be attempted before time expires.

How many questions and how much time does SACAA PPL Principles of Flight allow?

Principles of Flight is commonly scheduled for about 45 minutes. Question counts are typically in the 20–40 range (often around 30) depending on the paper generated by the SACAA online examination system. Confirm the on-screen timer and count for your sitting.

How much does the SACAA PPL Principles of Flight exam cost?

Expect roughly R425–R450 per theoretical subject under current SACAA fee practice, but always verify the live Part 187 / SACAA fee schedule. Many ATOs add an invigilation or facility charge on top of the Authority fee.

What topics does SACAA PPL Principles of Flight cover?

The PPL Combined Syllabus §11 covers the atmosphere and ISA, lift and aerofoils, drag and thrust/propeller, flying controls and high-lift devices, flight mechanics (level, climb, descent, turning), stalls and spin avoidance, stability, and load-factor/structural considerations including ground loads.

How long are PPL theory passes valid?

All required PPL theoretical subjects must normally be passed within 18 months of the first examination pass. After the final theory pass, candidates typically have 36 months to complete the PPL skills test before theory credits expire.