EASA PPL common mistakes
EASA PPL · Understand the traps and how to avoid them.
Treating altimeter setting changes as a simple 'add/subtract' rule, so when flying from a high-pressure area to a low-pressure area the candidate computes the wrong cleared altitude or misstates the direction of the altimeter error.
Candidates memorise the mnemonic 'high to low, look out below' but never derive it, so under exam pressure they invert the correction or forget that the altimeter over-reads when flying toward lower pressure. Questions are usually posed as 'what does the altimeter indicate' rather than 'which way does the error go', which breaks the memorised phrasing.
What to do instead
Re-derive the rule from first principles each time: the altimeter is a pressure gauge calibrated to ISA, so flying into lower pressure at constant indicated altitude means the true altitude is lower. Practise by drawing two columns (actual pressure, indicated altitude) and filling them in for four scenarios before checking the answer. Do ten such derivations in a row until the reasoning, not the phrase, is what you retrieve.
Answering airspace and clearance questions using the airspace classes or radio-failure rules of the candidate's home country rather than the ICAO/EASA framework the question is testing.
Many candidates train in one state and assume national differences (transponder requirements, VMC minima, clearance limits) are universal. PPL questions are written against ICAO Annex 2/11 and SERA, which differ from some national rules in detail, particularly VMC visibility and cloud-distance minima by class and by altitude band.
What to do instead
Build a single reference table of SERA airspace classes A–G with columns for VMC visibility, distance from cloud, and clearance requirement, and learn it as the examinable source. When a question cites a class, answer from that table, not from memory of local practice. Flag any national difference you know and consciously set it aside unless the question names the state.
Confusing engine and propeller control effects, e.g. stating that the mixture control sets power in cruise or that carburettor heat should be applied to clear icing at full power without leaning.
Candidates learn the controls as a list (throttle, mixture, carb heat, propeller) without a mental model of what each physically does. Because the throttle 'feels' like the power lever, mixture leaning is treated as an economy nicety rather than a power and detonation control, and carb heat is treated as a universal remedy.
What to do instead
Write one sentence per control describing the physical quantity it changes (manifold pressure, fuel/air ratio, intake air temperature, blade angle) and one sentence on the consequence of misusing it. Then answer questions by asking 'which physical quantity does this question change?' rather than by matching keywords. Include the carb-heat icing sequence (heat on, expect RPM drop, heat off after recovery) in the same notes.
Computing mass and balance or take-off/landing distance by plugging numbers into a formula without checking the units and datum convention, producing an answer that is numerically plausible but wrong by a factor or a sign.
Candidates rush the arithmetic and mix inches with millimetres, kilograms with pounds, or arm measured from the wrong datum. In graphical performance questions they read the chart at the wrong intersection because they do not first identify which variable is the input and which is the output.
What to do instead
Adopt a fixed written procedure: list every given value with its unit, convert all to one system before any calculation, state the datum explicitly, and compute total moment as the sum of (mass × arm). For charts, write the input variable and output variable at the top of your working before touching the graph. Do three worked examples per session with units written at every step.
Assuming performance figures are achievable regardless of surface, slope, wind, and density altitude, so the candidate selects the book take-off distance as the answer for a grass strip on a hot day at a high-elevation airfield.
Candidates treat the POH table as a single number rather than a baseline to be corrected. The correction factors (grass, slope, wet runway, headwind component, pressure altitude, temperature) are applied in a sequence that candidates skip under time pressure, and density altitude is often confused with pressure altitude.
What to do instead
Memorise the correction sequence as a checklist and apply it in the same order every time: pressure altitude, then temperature (density altitude), then wind component, then surface and slope. Practise by taking one POH table and generating five variants of the same question with different surfaces and temperatures, computing each fully. Always show the correction factors in your working so a missed factor is visible.
Answering hypoxia and decompression questions by altitude alone, ignoring time of useful consciousness, individual variation, and the difference between hypoxic and hypemic hypoxia.
Candidates reduce hypoxia to a single altitude threshold and miss that the exam tests the interaction of altitude, duration, and physiological state. They also conflate causes of hypoxia (stagnant, hypoxic, hypemic, histotoxic) and so pick the wrong type for a scenario such as carbon monoxide or high altitude without oxygen.
What to do instead
Learn a four-type hypoxia table with one aviation example each (hypoxic: altitude; hypemic: CO or anaemia; stagnant: G-loading or cold; histotoxic: alcohol). Separately memorise time of useful consciousness at the standard altitudes. For any scenario question, first name the type, then the altitude or cause, then the time factor, before reading the options.
Misreading a METAR or TAF by treating the trend group as current weather, or by misinterpreting the wind group's direction reference and units.
Candidates learn the code groups as vocabulary but not the report's temporal structure, so a BECMG or TEMPO group is read as present conditions. Wind direction is given in degrees true in TAFs and magnetic in ATIS, and candidates forget which product uses which reference, and forget that gusts are reported after the mean speed.
What to do instead
Parse every report in a fixed order and label each group with its time frame: observation time, wind, visibility, weather, cloud, temperature/dewpoint, pressure, then trend. Write 'now' or 'forecast' beside each group as you read. Learn explicitly that METAR and TAF wind directions are true and that ATIS and tower wind is magnetic, and check this in every wind question.
Computing heading and groundspeed without separating true and magnetic values, or applying variation and deviation in the wrong order or direction.
Candidates collapse the true–magnetic–compass chain into a single 'add or subtract variation' step and lose track of which reference the question asks for. Deviation is forgotten entirely because it is small in the training aircraft, and wind triangle work is done with the wrong vector as the result.
What to do instead
Write the full chain on every navigation question: true → (variation) → magnetic → (deviation) → compass, with 'east is least, west is best' applied explicitly at each arrow. For wind triangles, draw the three vectors (true track and groundspeed, wind, heading and TAS) to scale before calculating, and label which vector is the answer. Do five chain conversions with mixed east/west variation until the direction of each correction is automatic.
Treating emergency and abnormal procedures as a memorised list of actions rather than a decision sequence, so the candidate answers 'what do you do first' with a later checklist item.
Candidates memorise the content of checklists but not their priority order. Exam questions test the first action or the decision point (e.g. whether to continue or abandon after an engine failure on the runway), and candidates answer with the most memorable item rather than the first one.
What to do instead
For each major emergency (engine failure after take-off, forced landing, fire, pressurisation loss, radio failure), write the sequence as numbered priorities: aviate, navigate, communicate, then the specific memory items. Learn which actions are memory items and which are checklist items. When answering, ask 'is this the first action or a later one?' and eliminate options that are correct but out of order.
Explaining lift with the equal-transit-time or 'venturi' argument, or confusing induced drag with parasite drag when answering questions about the drag curve and speed stability.
The simplified school explanation is memorable and appears in many secondary sources, so candidates reproduce it even though it is physically wrong. Consequently they misanswer questions on angle of attack, stall, and the back side of the drag curve, and they cannot explain why induced drag falls with speed while parasite drag rises.
What to do instead
Replace the equal-transit-time explanation with the correct one: lift arises from the pressure distribution generated by deflecting air downward, and the wing stalls when the critical angle of attack is exceeded regardless of speed. Draw the total drag curve with its induced and parasite components and mark the minimum-drag speed. For every lift question, ask whether the answer depends on angle of attack rather than on speed or camber alone.
Using non-standard phraseology or omitting the readback of clearances that require one, particularly runway-holding and altitude instructions, in questions about radio communication.
Candidates learn phraseology as vocabulary and do not internalise which transmissions require a full readback. They also mix ICAO standard phraseology with conversational English heard on frequency, and forget that a clearance to line up or hold is not a take-off clearance.
What to do instead
Learn the readback-required list explicitly: runway holding instructions, taxi clearances involving a runway, altitude and heading instructions, and approach clearances. Practise by writing out the correct readback for ten sample clearances, including the callsign at the end. Distinguish 'line up and wait', 'cleared for take-off', and 'hold short' as three separate clearances and never substitute one for another.