ATPL Cheat Sheet: All 13 Subjects on One Page
The must-know facts of every EASA ATPL paper on one page: formulas, numbers, limits and rules, then the traps the exams set. Every line comes from the explanations in our question banks and the v1prep Library, which cite the regulation or manual behind them. Use Test yourself to hide the answers and tap each one to check, or print a clean sheet for each paper. The first section of every paper is free to read; the rest is for v1prep members on any paid plan.
✓ Unlocked: your plan includes the full cheat sheet.
Air Law
44 questions · 1 h 00The international conventions and ICAO, licensing and medical rules, the rules of the air, airspace and air traffic services, and the PANS-OPS procedures.
Diagram: The class sets who is separated and who is only told: A and B separate everything, C separates VFR from IFR, D only IFR from IFR.

ICAO and the conventions
- Chicago Convention
- Signed December 1944; created ICAO, Montreal; SARPs in 19 Annexes, Annex 19 being Safety Management
- Key Annexes
- 1 Licensing, 2 Rules of the Air, 6 Operation, 7 Registration marks, 11 ATS, 13 Investigation, 14 Aerodromes, 17 Security, 18 Dangerous goods
- Tokyo, Hague, Montreal
- Tokyo 1963: offences on board, State of Registration has jurisdiction; Hague 1970: hijacking; Montreal 1971: unlawful acts against safety
Licences and medicals (Part-FCL, Part-MED)
- Theory exams
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- Recent experience
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- Class 1 medical
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- Ages
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Rules of the Air
- VMC, classes A to E
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- Right of way
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- Semicircular rule
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- IFR minimum level
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Airspace and air traffic services
- Airspace classes
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- Special squawks
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- Alerting phases
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- Vertical separation
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- Wake turbulence
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Procedures (PANS-OPS)
- Holding pattern
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- Holding speeds
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- Approach categories
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- Gradients and clearances
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Exam traps
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Aircraft General Knowledge
80 questions · 2 h 00Airframe structure and systems (hydraulics, pressurisation, oxygen, fire protection and fuel), aircraft electrics, and piston and gas turbine powerplants.
Diagram: The CSD or IDG holds 400 Hz, and four things must match before two alternators are paralleled: voltage, frequency, phase and phase sequence.

Structure and hydraulics
- Design philosophies
- Safe-life: retired at a set life. Fail-safe: multiple load paths. Damage-tolerant: slow cracks found at normal inspections
- Catastrophic failure (CS-25)
- Must be extremely improbable: of the order of 1 × 10⁻⁹ per flight hour or less
- Hydraulic fluids
- Mineral DTD 585: red, neoprene seals. Skydrol phosphate ester: purple or green, butyl seals, fire resistant. Never mix
- Transport hydraulic pressure
- Typically 3,000 psi (some 4,000, A380 and A350 5,000) from constant-pressure, variable-volume pumps
- Power transfer unit
- Hydraulic motor driving a pump: moves power between two systems without transferring fluid
Pressurisation, oxygen, fire and fuel
- Cabin altitude
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- Crew oxygen (CAT.OP.MPA.285)
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- Engine fire protection
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- Jet A-1
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Electrics
- Ohm's law and power
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- Resistors
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- Battery cells (on load)
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- Aircraft AC
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- Paralleling alternators
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Engines
- Jet thrust
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- Compressor stall or surge
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- Abnormal starts
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- Bleed air extraction
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- Constant-speed unit
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Exam traps
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Instrumentation
60 questions · 1 h 30Pitot-static and air data instruments, magnetism and compasses, gyroscopes and inertial systems, the radio altimeter, warning systems and automatic flight.
Diagram: Pitot gives total pressure (static + dynamic) to the ASI and Machmeter only; static feeds all four instruments.

Air data
- Dynamic pressure
- Pitot (total) − static = ½ρV²; the ASI measures it, calibrated for ISA sea-level density (1225 g/m³)
- IAS to TAS
- IAS → CAS (instrument and position error) → EAS (compressibility) → TAS (density)
- Climb schedules
- Constant CAS: TAS and Mach rise. Constant Mach: CAS and TAS fall in the troposphere; TAS constant in an isothermal layer
- Speed of sound
- LSS = 38.95 × √T (kelvin): 661 kt at ISA sea level; Mach = TAS ÷ LSS
- Air temperatures
- TAT = SAT + full ram rise. From the probe reading: SAT = reading ÷ (1 + 0.2 Kr M²), in kelvin (Kr = recovery factor)
- Altimeter errors
- About 30 ft per hPa; subscale unchanged, flying towards lower pressure or colder air it over-reads: the aircraft is lower than shown
Compass and gyroscopes
- Acceleration errors (N hemisphere)
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- Turning errors (N hemisphere)
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- Gyro rigidity
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- Earth rate
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- Rate 1 turn
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Inertial and radio altimeter
- INS principle
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- Ring laser gyro
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- Radio altimeter
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Warnings and automatic flight
- GPWS modes
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- Stall warning margin
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- TCAS II
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- Aural priority
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- Autoland status
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- EFIS colours
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Exam traps
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Mass and Balance
25 questions · 1 h 15Mass definitions and structural limits, standard masses and weighing, and how the centre of gravity is found, moved and kept within limits.
Diagram: The lowest limit wins: take-off mass is capped by MTOM, the performance limit, MZFM + take-off fuel and MLM + trip fuel.

Mass definitions
- Basic empty mass
- Airframe, engines, fixed equipment, unusable fuel and full operating fluids; no crew, usable fuel or load
- Dry operating mass
- BEM + crew and their baggage, catering and passenger service equipment, potable water, lavatory chemicals
- Operating mass
- DOM + take-off fuel
- Zero fuel mass and traffic load
- ZFM = DOM + traffic load; traffic load = TOM − operating mass
- Useful load (EASA)
- Traffic load + take-off fuel = TOM − DOM
- Ramp and landing mass
- Ramp mass = TOM + start-up and taxi fuel; landing mass = TOM − trip fuel
Limits
- Maximum zero fuel mass
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- Regulated take-off mass
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- Take-off mass for a flight
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- Maximum traffic load
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Centre of gravity
- CG position
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- CG in %MAC
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- Moving mass
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- Adding or removing mass
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- Forward CG
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- Aft CG
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Standard masses, weighing and fuel
- Standard passenger masses
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- Which table
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- Weighing
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- Fuel mass
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Exam traps
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Performance
45 questions · 2 h 00Performance classes and runway conditions, take-off speeds and field lengths, the take-off climb and obstacle clearance, climb, cruise and en-route performance, and landing.
Diagram: Twin, one engine out: segment 1 positive, segment 2 2.4%, segment 4 1.2%; the net path is 0.8% lower and must clear obstacles by 35 ft.

Classes and dispatch
- Performance class A
- All multi-engine turbojets; multi-engine turboprops with more than 9 seats or MTOM above 5,700 kg
- Wind for dispatch
- Take-off and landing data: no more than 50% of the reported headwind, at least 150% of the reported tailwind
- Class B field length
- No stopway or clearway: gross take-off distance × 1.25 ≤ TORA
Take-off
- V1 limits
- ut ad lorem elit labore minim
- V2 (Class A)
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- Balanced field
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- Field length (Class A)
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- Wet runway (Class A)
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- Reduced thrust (assumed temperature)
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Take-off climb and en route
- Climb segments
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- Gross gradients, twin OEI
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- Net flight path
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- En route, one engine out
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- Climb gradient
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Cruise and landing
- Range and endurance speeds
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- Jet landing distance
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- Class B landing distance
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- Go-around gradients (Class A)
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- VREF
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- Hydroplaning speed
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Exam traps
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Flight Planning and Monitoring
42 questions · 2 h 00Fuel planning under the EASA fuel scheme, air and ground distance, the point of equal time and point of safe return, the ICAO flight plan, ETOPS and chart minimum altitudes.
Diagram: Each fuel block answers a different question: contingency is the higher of 5% of trip fuel and 5 min holding, final reserve 30 min at 1,500 ft for turbines.

Fuel planning (EASA basic fuel scheme)
- Fuel blocks
- Taxi, trip, contingency, alternate, final reserve, additional (if required), extra; take-off fuel = block fuel − taxi fuel
- Contingency fuel
- Higher of 5% of trip fuel and 5 min holding at 1,500 ft above the destination, ISA
- Alternate fuel
- From a missed approach at the destination to a landing at the alternate; no contingency is added to it
- Final reserve fuel
- Turbine: 30 min holding at 1,500 ft above aerodrome elevation, ISA. Piston: 45 min
- Additional fuel
- If the other blocks fall short: engine failure or depressurisation at the critical point, divert, hold 15 min at 1,500 ft above the alternate, land
- Isolated aerodrome (turbine)
- Additional + final reserve fuel = 2 h at normal cruise consumption above the destination
- MINIMUM FUEL and MAYDAY FUEL
- MINIMUM FUEL: committed to one aerodrome, any change may mean landing below final reserve; no priority. MAYDAY FUEL: predicted landing below final reserve
Air distance, PET and PSR
- Air and ground miles
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- PET distance
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- PET and wind
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- Engine-failure PET
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- PSR time
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- PSR and wind
- aliqua exercitation consectetur incididunt enim ullamco adipiscin
ATC flight plan
- Filing and delay
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- Item 8
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- Item 9 wake category
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- Item 10 equipment
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- Item 15 speed and level
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ETOPS and minimum altitudes
- ETOPS threshold
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- Grid MORA
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Exam traps
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Human Performance and Limitations
48 questions · 1 h 30The body at altitude, the senses and their illusions, health, sleep and fatigue, and the psychology of error, decision-making and crew cooperation.
Diagram: Classify an error by the intention: slips, lapses and mistakes are honest errors, violations deliberate departures from the rules.

Respiration and altitude
- Gas laws
- Boyle: at constant temperature, volume inversely proportional to pressure. Dalton: total = sum of partial pressures. Henry: dissolved gas ∝ pressure
- Types of hypoxia
- Hypoxic (altitude), anaemic (blood cannot carry oxygen, e.g. CO), stagnant (poor blood flow), histotoxic (cells cannot use it)
- Oxygen thresholds
- Air up to 10,000 ft; oxygen and air mix to 33,700 ft; 100% oxygen to 40,000 ft; pressure breathing above
- Hyperventilation
- Washes out CO₂ and raises blood pH; slow the breathing, but at altitude treat it as hypoxia first
- Decompression sickness
- Nitrogen bubbles (Henry's law): bends, creeps, chokes, staggers; likelier the higher and longer above 18,000 ft
Senses and illusions
- Vestibular organs
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- Somatogravic illusion
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- Runway illusions
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- The eye
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- Collision risk
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Health, sleep and fatigue
- Alcohol
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- Carbon monoxide
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- Circadian rhythm
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- Sleep
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Cognition, error and CRM
- Arousal and performance
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- Short-term memory
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- Error types (Reason)
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- SHELL model
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- Threat and error management
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- Hazardous attitudes
- magna nostrud amet tempor aliqua exercitation consectetu
Exam traps
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Meteorology
84 questions · 2 h 00The atmosphere and altimetry, stability and cloud, wind, weather hazards such as icing, thunderstorms and fog, and the METAR and TAF codes.
Diagram: The ISA in one table: +15 °C and 1013.25 hPa at sea level, 1.98 °C less per 1,000 ft to 36,090 ft, then a constant −56.5 °C.

ISA and altimetry
- ISA at mean sea level
- +15 °C, 1013.25 hPa, density 1225 g/m³
- ISA lapse rate
- 1.98 °C per 1,000 ft (0.65 °C per 100 m) up to 11 km (36,090 ft)
- ISA above 11 km
- Constant −56.5 °C from 11 km up to 20 km (65,617 ft)
- Height per hPa
- 27 ft per hPa at MSL; about 50 ft at 20,000 ft and 100 ft at 40,000 ft
- Temperature error
- 4 ft per °C of ISA deviation per 1,000 ft above the pressure datum
Stability and cloud
- DALR and SALR
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- Absolute stability or instability
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- Conditional instability
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- Cumulus base estimate
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Wind
- Buys Ballot's law
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- Surface wind (northern hemisphere)
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- Jet stream
- ipsum sed et veniam dolor do dolore quis sit eiusmod magna nostrud amet tempor aliqua
Hazards
- Clear and rime ice
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- Thunderstorm mature stage
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- Microburst
- labore minim ipsum sed et veniam dolor do dolore quis sit eiusmod magna nostrud amet tempor
- Radiation fog
- et veniam dolor do dolore quis sit eiusmod magna nostrud amet tempor aliqua exe
METAR and TAF
- CAVOK
- exercitation consectetur incididunt enim ullamco adipiscing ut ad lorem elit labore minim ipsum sed et veniam
- Cloud amounts
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- TEMPO
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- Wind reference
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Exam traps
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General Navigation
55 questions · 2 h 15The Earth, distance and direction, magnetism and the compass, chart projections, time, airspeeds and dead reckoning.
Diagram: On a Lambert chart a straight line is very nearly a great circle; on a Mercator it is a rhumb line. The great circle always lies on the polar side.

The Earth and distance
- Shape of the Earth
- Oblate spheroid, flattening about 1/298; WGS-84 is the reference model for aviation
- Nautical mile
- 1 NM = 1,852 m (about 6,076 ft); 1° of latitude ≈ 60 NM
- Departure
- Departure (NM) = ch.long (minutes) × cos latitude
- Convergency
- Earth convergency = ch.long × sin mean latitude; conversion angle = ½ convergency
- Great circle and rhumb line
- The great circle lies on the polar side of the rhumb line in both hemispheres
Direction and the compass
- Variation and deviation
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- True to magnetic
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- Turning errors (northern hemisphere)
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- Acceleration errors (northern hemisphere)
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Charts
- Mercator
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- Lambert conformal conic
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- Polar stereographic
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- Orthomorphic (conformal)
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Time
- Arc to time
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- International Date Line
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- Civil twilight
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Speeds and dead reckoning
- Airspeed chain
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- Speed of sound
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- Climbing at constant CAS or Mach
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- 1 in 60 rule
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Exam traps
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Radio Navigation
66 questions · 1 h 30Radio waves and propagation, NDB and ADF, VOR, ILS, DME, radar and SSR, GNSS and performance-based navigation.
Diagram: Three satellites fix the position, the fourth the receiver clock; RAIM needs a fifth to detect a fault and a sixth to exclude it.

Radio waves and NDB
- Frequency and wavelength
- λ (m) = 300 ÷ f (MHz); radio waves travel at 300,000,000 m/s
- VHF line-of-sight range
- Range (NM) = 1.23 × (√h1 + √h2), heights in ft
- NDB
- 190 to 1,750 kHz (LF and MF), surface wave; ADF accuracy ±5° within the DOC by day
- ADF bearing to the beacon
- QDM = magnetic heading + relative bearing (subtract 360 if needed)
- Night effect
- Sky wave returns at night and distorts ADF bearings; worst at dusk and dawn
VOR and ILS
- VOR
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- CDI sensitivity
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- ILS frequencies
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- ILS coverage
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- False glide paths
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- Marker beacons
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DME and SSR
- DME
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- DME accuracy and capacity
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- SSR
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GNSS and PBN
- GPS constellation
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- Satellites needed
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- Largest GPS error
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- RNAV and RNP
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- Accuracy figures
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Exam traps
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Operational Procedures
42 questions · 1 h 15Operating rules for commercial air transport: minima, alternates, crew limits, wake turbulence, windshear, contaminated runways, emergencies and dangerous goods.
Diagram: The wake sinks below the path that made it: stay above that path and land beyond that touchdown point.

Minima and alternates
- Approach categories (VAT)
- A below 91 kt; B 91-120 kt; C 121-140 kt; D 141-165 kt
- Lowest circling minima
- Cat C: MDH 600 ft, visibility 2,400 m; Cat D: MDH 700 ft, 3,600 m
- CAT I
- DH not below 200 ft; RVR not below 550 m
- Take-off alternate distance
- Two engines: within 1 hour at OEI cruise speed in still air; three or four engines: within 2 hours
Crew limits (Part-CAT, ORO.FTL)
- Alcohol
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- Cumulative duty
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- Cumulative flight time
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- Minimum rest
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- WOCL
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Wake turbulence and windshear
- Wake categories (MTOM)
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- Radar spacing on approach
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- Departure spacing
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- Microburst on approach
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Contaminated runways
- Wet or contaminated
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- Runway condition codes
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- Take-off depth guide
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- Aquaplaning speed
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Emergencies and dangerous goods
- Ditching
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- Evacuation demonstration
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- Dangerous goods rules
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Exam traps
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Principles of Flight
46 questions · 1 h 30Lift and drag, the stall and high-lift devices, stability, climb, glide and turning flight, and high-speed flight.
Diagram: A wing stalls at an angle, never at a speed: weight and load factor move the stall speed with their square root, the angle stays put.

Lift and drag
- Lift equation
- L = ½ ρ V² × CL × S, with V the TAS and ½ ρ V² the dynamic pressure
- Drag and speed
- Parasite drag varies as V², induced drag as 1/V²; CDi = CL² ÷ (π × AR)
- VMD
- Minimum total drag where induced drag = parasite drag; maximum L/D; VMP is slower
Stall and high-lift devices
- Stall speed and mass
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- Stall speed in a turn
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- Trailing-edge flaps
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- Leading-edge slats
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- CS-25 speed margins
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Stability
- Centre of gravity limits
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- Static margin
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- Dutch roll and spiral
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- Phugoid
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Climb, glide and turns
- Climb gradient
- incididunt enim ull
- VX and VY
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- Best glide
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- Turn radius and rate
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High-speed flight
- MCRIT
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- What moves MCRIT
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- Mach tuck
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- Climb at constant IAS
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Exam traps
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Communications
34 questions · 1 h 00VFR and IFR radiotelephony: transmitting technique, standard words, readback, call signs, distress and urgency, communication failure, position reports and VHF.
Diagram: MAYDAY buys silence, PAN PAN buys priority: the message order, frequency and squawk all follow from that one choice.

Transmitting technique
- Numbers
- 3 TREE, 4 FOW-ER, 5 FIFE, 8 AIT, 9 NIN-ER; decimal DAY-SEE-MAL
- Hundreds and thousands
- Whole hundreds and thousands of altitude, height, visibility and RVR: 11,000 ft is WUN WUN TOUSAND
- Frequencies
- All six digits are spoken; only the first four if the last two are zeros
- Readability scale
- 1 unreadable, 2 readable now and then, 3 readable with difficulty, 4 readable, 5 perfectly readable
- Time
- UTC; normally the minutes only; time checks to the nearest half minute
Standard words and readback
- AFFIRM, NEGATIVE, WILCO
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- Mandatory readback
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- TAKE OFF
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- Abbreviated call signs
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Distress and urgency
- Message priority
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- MAYDAY and PAN PAN
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- Distress message order
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- Silence and its end
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- Squawks and frequency
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Communication failure
- In VMC
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- IFR in IMC: level and speed
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- IFR in IMC: landing
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Reports and VHF
- Position report
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- VHF voice band
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Exam traps
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Now practise them under exam conditions
6,000 ATPL questions across all 13 papers, each answer explained and sourced, with timed mock exams at the official length.
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