PPL Ground School
Key topics for Private Pilot Licence ground school preparation — from principles of flight to air law and human factors.
The Private Pilot Licence (PPL) requires passing multiple written examinations. The exact subjects and exam format vary by authority (FAA, EASA, UK CAA, etc.) but core topics are consistent worldwide. This guide covers the principal subject areas.
Core PPL Subject Areas
Principles of Flight
Lift, drag, thrust, weight. Four forces, angle of attack, stall theory, stability.
Aircraft General Knowledge
Airframe, engine types (piston), propellers, fuel systems, hydraulics.
Meteorology
Atmosphere, pressure, fronts, clouds, icing, thunderstorms, fog types.
Navigation
Dead reckoning, VOR, NDB, chart reading, track and heading calculations.
Communications
VHF radio, ICAO phraseology, ATIS, Q-codes, distress procedures.
Air Law
ICAO conventions, national regulations, ROW, airspace, lights, licences.
Human Factors
IMSAFE, hypoxia, spatial disorientation, decision-making, CRM basics.
Flight Planning
NOTAMs, weather briefing, fuel planning, W&B, performance.
Principles of Flight
The Four Forces
| Force | Direction | Source |
|---|---|---|
| Lift | Upward | Wing aerodynamics (Bernoulli + Newton) |
| Weight | Downward | Gravity |
| Thrust | Forward | Propeller / jet engine |
| Drag | Rearward | Aerodynamic resistance |
Stall: A stall occurs when the critical angle of attack (typically ~15°) is exceeded, regardless of airspeed. A high-speed stall (e.g., in a steep turn) can occur well above Vs.
Recovery: Reduce angle of attack (stick forward), apply full power, level wings.
Stability
- Longitudinal stability: nose-up/down tendency — provided by tailplane (horizontal stabiliser)
- Lateral stability: roll tendency — provided by dihedral, sweepback, high wing design
- Directional stability: yaw tendency — provided by fin (vertical stabiliser)
- Static stability: initial tendency to return to equilibrium
- Dynamic stability: subsequent motion after displacement (positive = oscillations dampen)
Aircraft Systems
Piston Engine Operation (4-stroke cycle)
| Stroke | Piston | Valves | Event |
|---|---|---|---|
| Induction | Down | Intake open | Fuel/air mixture drawn in |
| Compression | Up | Both closed | Mixture compressed |
| Power | Down | Both closed | Spark ignites, combustion pushes piston |
| Exhaust | Up | Exhaust open | Burnt gases expelled |
Fuel Systems
- AVGAS 100LL (low-lead) — blue colour — for most piston engines
- Fuel grades must match engine requirements exactly
- Sumping (water checks): always drain fuel from each sump point before flight
- Fuel starvation vs fuel exhaustion: starvation = fuel present but not reaching engine; exhaustion = fuel depleted
Air Law Essentials
Rules of the Air (ICAO Annex 2)
| Rule | Detail |
|---|---|
| Right of way — general | Less manoeuvrable aircraft has right of way |
| Aircraft converging | Aircraft on the right has right of way |
| Head-on | Both turn right |
| Overtaking | Overtaking aircraft gives way; passes on the right |
| Landing | Aircraft on approach/landing has right of way over those in level flight |
| Emergency | Emergency aircraft always has priority |
VFR Minima (ICAO — below FL100, not in Class A/B/C/D)
- Distance from cloud: 1500 m horizontally, 300 m (1000 ft) vertically
- In-flight visibility: 5 km (1500 m below 3000 ft AMSL at ≤140 kt — Special VFR in some airspace)
Aircraft Lighting Requirements
- Day VFR: No lights required (but recommended)
- Night VFR: Anti-collision (strobe/beacon), nav lights (red left, green right, white tail), landing light
Human Factors
IMSAFE Personal Checklist
| Letter | Factor | Consider |
|---|---|---|
| I | Illness | Any active medical condition affecting fitness to fly? |
| M | Medication | Any drugs (prescribed or OTC) affecting performance? |
| S | Stress | Emotional or mental stress impairing judgement? |
| A | Alcohol | Within legal limits? (Generally 8 hrs bottle-to-throttle, <0.04% BAC) |
| F | Fatigue | Adequate sleep? Cumulative fatigue? |
| E | Eating | Properly nourished? Blood sugar stable? |
Hypoxia
- Onset typically above 10,000 ft (varies by individual)
- Symptoms: euphoria, impaired judgment, cyanosis, loss of consciousness
- Treatment: supplemental oxygen, descend immediately
- Night vision impaired above ~5,000 ft
Spatial Disorientation
Common illusions:
- Leans: false sense of bank after returning to level flight
- Graveyard spin: feels like level flight during undetected spin
- Somatogravic illusion: forward acceleration feels like nose-up pitch
- Trust instruments, not body sensations
Study Resources
- Official PPL syllabus varies by authority. Refer to:
- EASA Part-FCL for European requirements
- FAA FAR/AIM for US requirements
- UK CAA CAP 804 for UK requirements
- Always study from your authority's current approved materials