Mauritius DCA PPL Theory common mistakes
Mauritius DCA PPL Theory · Understand the traps and how to avoid them.
When calculating a crosswind component, candidates use the full wind speed instead of the component perpendicular to the runway, or they apply the sine factor to the wrong angle (for example, using the angle between wind and runway centreline in the cosine slot). They then accept or reject a runway based on the wrong number.
The trigonometry is learned once in Principles of Flight and never rehearsed under exam pressure. Candidates also confuse the acute angle between wind and runway with its complement, and in a written paper there is no wind arrow drawn on a diagram to anchor the geometry.
What to do instead
Before the exam, memorise the sine table for 10, 20, 30, 40, 50, 60, 70 and 90 degrees and practise ten crosswind questions using a sketch: draw the runway, draw the wind arrow, mark the acute angle, then apply crosswind = wind speed x sin(angle) and headwind = wind speed x cos(angle). Check your answer is plausible: at 30 degrees the crosswind is half the wind speed, at 60 degrees it is about 0.87 of it.
Candidates calculate mass and balance but forget to re-check the centre of gravity after adding fuel, baggage or a last-minute passenger, or they mix up the datum, arm and moment units and place the CG outside the forward or aft limit without noticing.
Mass and balance is treated as a single arithmetic exercise rather than a sequence of checks. Unit slips (inches versus metres, pounds versus kilograms) and using the wrong arm for a station are common, and candidates rarely sanity-check the final CG position against the envelope.
What to do instead
Use a fixed tabular layout: item, mass, arm, moment, then total and divide. Convert all units to one system before starting. After computing the CG, plot it on the envelope and ask whether the answer is near a limit; if it is, recheck the arms and the fuel figure. Practise one aft-limit and one forward-limit case so you recognise the shape of an out-of-limits answer.
In Air Law, candidates answer from general aviation intuition rather than the specific rule, for example assuming a VFR cloud clearance or visibility that feels safe, or confusing the privileges and validity periods of the PPL, class ratings and medical certificates.
Air Law is memorisation-heavy and candidates skim the numbers, trusting that the 'obvious' answer is right. The Mauritian ANPR and ICAO Annex differences, plus the distinction between licence validity, rating validity and recency, are easy to blur.
What to do instead
Build a one-page table of the numeric limits you must know: VFR visibility and cloud distance by airspace class and altitude, licence and rating validity periods, medical validity by age, and fuel reserves. Learn each number with its source article so you can reconstruct it. When a question asks about privileges, answer strictly from the licence and rating text, not from what instructors allow in practice.
Candidates confuse QNH, QFE and QNE and use the wrong setting when converting between indicated altitude, true altitude and flight level, especially on a question involving a transition altitude or a pressure change along the route.
The three settings look similar and the mnemonic is learned without understanding what each one references. Candidates also forget that the standard pressure setting is used above the transition altitude and that a change of 1 hPa corresponds to roughly 30 ft at low altitude.
What to do instead
Anchor each term to a reference: QNH gives elevation when on the ground, QFE gives height above the aerodrome, QNE is the standard 1013.25 hPa used for flight levels. Learn the 1 hPa = 30 ft rule and practise questions where the pressure changes en route: work out whether the aircraft is higher or lower than the altimeter suggests before choosing an answer.
On radiotelephony questions, candidates write readbacks that omit the mandatory elements, use non-standard phraseology, or fail to read back a clearance, runway holding point or SSR code in the correct order.
Phraseology is practised orally in the aircraft but rarely written out. Candidates reproduce what they say on the radio rather than the standard format, and they forget that a clearance must be read back in full, including the callsign and any level or route instruction.
What to do instead
Write out ten standard exchanges by hand (departure, position report, joining, landing, taxi) and compare them with the standard phraseology in the AIP and the radiotelephony guide. Learn the readback rule: clearances, runway instructions, holding points, SSR codes and frequency changes are always read back. In the exam, check every answer for callsign, instruction and readback completeness.
Candidates treat performance questions as single-formula problems and ignore the effect of density altitude, wind, runway slope and surface on take-off and landing distances, or they read a graph from the wrong axis or at the wrong temperature.
Performance charts are read quickly and the candidate picks the first number that looks close. The compounding of density altitude with mass and wind is not intuitive, and graph-reading under time pressure leads to misread scales.
What to do instead
Work every performance question in a fixed order: pressure altitude, then temperature to get density altitude, then mass, then wind and slope corrections, applying each factor in sequence. Mark the graph with a pencil line and re-read the axis labels before committing. Learn the direction of each effect (higher density altitude increases both take-off and landing distance) so you can reject an answer that moves the wrong way.
In Meteorology, candidates misidentify cloud types and the weather associated with each, or they confuse the conditions for formation of cumulonimbus, icing and turbulence, and they mix up the symbols and meanings on significant weather charts.
Cloud and weather recognition is visual in flight but symbolic in the exam. Candidates memorise names without linking them to stability, moisture and lifting, so they cannot reason out what a given sounding or chart implies.
What to do instead
Learn each cloud family with its stability regime and associated hazards: cumulus and cumulonimbus with instability, stratus with stable moist air, altocumulus castellanus as a warning of instability aloft. For charts, practise decoding a SIGWX and a low-level significant weather chart symbol by symbol. For any weather question, reason from temperature, dewpoint and lapse rate rather than memory alone.
On Navigation questions, candidates plot a course but confuse true, magnetic and compass headings, apply variation in the wrong direction, or forget to allow for wind when converting between heading and track.
The triangle of velocities is taught once and rarely revisited, and the sign convention for variation (east is least, west is best) is memorised as a rhyme without understanding. Candidates also forget that deviation is a property of the aircraft compass, not the location.
What to do instead
Draw the triangle for every wind question: true track and distance, wind vector, then true heading and groundspeed. Convert true to magnetic using variation with the correct sign, then to compass using deviation. Write the conversion chain at the top of your working sheet and follow it mechanically. Practise five questions where variation is east and five where it is west so the sign becomes automatic.
In Human Performance, candidates answer from common sense rather than physiology, for example attributing hypoxia symptoms to fear, confusing hyperventilation with hypoxia, or misjudging the effects of fatigue, alcohol and medication on judgement.
The subject feels intuitive, so candidates do not study the specific symptom lists, time-of-useful-consciousness figures or the legal limits. The overlap between hypoxia and hyperventilation is a classic trap because both cause dizziness and tingling.
What to do instead
Learn the symptom sets side by side: hypoxia causes euphoria, cyanosis and impaired judgement, while hyperventilation causes tingling, dizziness and often improves with controlled breathing and reassurance. Memorise the alcohol, medication and fatigue rules and the time-of-useful-consciousness table. For each question, identify which physiological mechanism is being tested before looking at the options.
On Aircraft General Knowledge and Principles of Flight questions, candidates describe what a system or control does rather than how it works, so they cannot answer questions on the four forces in a turn, load factor, stall speed change with mass and bank, or the effect of a system failure on indications.
Candidates memorise labels and diagrams without building a mental model. Load factor and stall speed relationships are formula-based and are often skipped, and system questions are answered from the POH summary rather than from an understanding of the circuit.
What to do instead
For Principles of Flight, learn the load factor formula n = 1/cos(bank) and the stall speed relationship Vs increases with the square root of load factor, then work numerical examples at 30, 45 and 60 degrees of bank. For systems, trace each circuit from source to consumer and ask what the gauge would read if a component failed. Explain each answer aloud in one sentence; if you cannot, you do not yet know it.