NCAA Air Traffic Controller Licence common mistakes
NCAA Air Traffic Controller Licence · Understand the traps and how to avoid them.
Applying the rule for one category of separation (e.g., radar lateral separation minima) directly to another situation (e.g., procedural or vertical separation) without checking which minima table actually governs the case.
The syllabus mixes several separation regimes (radar, procedural, vertical, longitudinal, runway) and candidates memorise one set of numbers, then pattern-match every question to those familiar numbers instead of identifying the applicable regime first.
What to do instead
Before calculating, write down the separation regime the question describes (surveillance vs procedural, same vs crossing track, on approach vs en route). Then recall the minima only for that regime. Build a one-page comparison table of the minima and their conditions and rehearse it until the trigger conditions, not the numbers, come first.
Treating wake turbulence separation as a fixed distance for all aircraft pairs rather than a category-pair and phase-of-flight dependent value.
Candidates remember a single 'heavy behind heavy' figure and forget that minima change with leader/follower weight categories, whether the following aircraft is on approach, departure, or crossing behind, and whether radar or time-based minima apply.
What to do instead
Memorise the category matrix (Super/Heavy/Medium/Light) with the specific minima for approach, departure and en-route crossing, and practise classifying sample aircraft types into categories. For each question, identify leader category, follower category and phase before selecting a value.
Reading a flight strip, flight plan or METAR/TAF and answering from the first salient number rather than interpreting the whole item (units, validity period, trend, or conditional group).
Time pressure encourages scanning for a familiar figure. Candidates miss that pressure is in hPa vs inHg, wind in degrees true vs magnetic, visibility in metres vs statute miles, or that a TEMPO/BECMG group changes the answer.
What to do instead
Adopt a fixed decode order for each message type (e.g., for METAR: station, time, wind, visibility, weather, cloud, temperature, pressure, trend) and say each element aloud mentally before answering. Practise converting units both ways until conversions are automatic.
Confusing magnetic and true directions, or applying magnetic variation in the wrong direction, when computing headings, tracks, bearings or runway-in-use.
Charts and wind reports use different references, and candidates apply variation with the wrong sign or forget it entirely, especially under exam pressure where the question deliberately supplies both values.
What to do instead
Use the mnemonic 'variation east, magnetic least; variation west, magnetic best' and always write the conversion as an equation with the sign shown. Do at least twenty practice conversions mixing east and west variation before attempting mixed-topic questions.
Answering meteorology questions about icing, turbulence, thunderstorms or wind shear with a vague descriptive statement instead of the specific cause, condition or operational consequence the syllabus expects.
These topics are taught descriptively and candidates revise by reading rather than by testing, so they recognise terms but cannot discriminate between, for example, freezing rain and freezing drizzle, or between different turbulence intensities.
What to do instead
Convert each meteorology topic into a cause→condition→hazard→controller action chain and test yourself on the discriminators (temperature range, droplet size, cloud type). Use short answer cards rather than re-reading notes.
Mixing up the meanings of clearances, instructions and information, and answering a phraseology question with a non-standard or incomplete readback.
Candidates learn phraseology by exposure rather than by rule, so they do not distinguish what must be read back in full, what may be acknowledged, and which items (altitude, heading, frequency, runway) are mandatory readback items.
What to do instead
Learn the definitions of clearance, instruction and information as separate categories, then list the mandatory readback items and rehearse full readbacks for representative clearances. Practise spotting the missing element in a faulty readback.
Calculating time, distance, speed or fuel problems without setting out units and the relationship used, leading to arithmetic slips or answers in the wrong unit.
Candidates do mental arithmetic under time pressure and forget that the exam offers distractors in the wrong unit (minutes vs hours, feet vs metres, knots vs km/h).
What to do instead
Always write the formula (time = distance ÷ speed, etc.), convert all inputs to consistent units first, and sanity-check the answer against an estimate. Practise a fixed set of calculation types until the method is automatic.
Answering airspace, classification or service-provision questions from general knowledge rather than from the specific class of airspace and type of service stated in the question.
Airspace classes differ in the services and clearances they require, and candidates generalise from one class to another or from their home-state rules to the international framework the syllabus tests.
What to do instead
Build a class-by-class table (A to G) listing separation provided, clearance required, and services available, and test yourself by covering rows. For each question, first name the airspace class and service type, then answer.
Ignoring the operational context in human factors and safety questions, answering with a generic 'be more careful' or 'follow procedures' statement instead of naming the specific error type, threat or mitigation.
Human factors content feels intuitive, so candidates do not study the vocabulary (slips, lapses, mistakes, violations, situational awareness, workload, threat and error management) and cannot match the correct term to the scenario.
What to do instead
Learn the definitions of each error and threat category with one concrete aviation example each, then practise classifying short scenarios. Always name the category and the specific mitigation rather than offering a general exhortation.
Leaving questions blank or changing correct answers on review because of uncertainty, rather than using a consistent elimination strategy and only changing an answer when a concrete reason is found.
Candidates misinterpret the scoring (no penalty for guessing in most formats) and second-guess themselves, converting correct first answers into wrong ones under anxiety.
What to do instead
Adopt a rule: answer every question, flag uncertain ones, and on review change an answer only when you can state the specific fact that makes the original wrong. Rehearse this under timed mock conditions so the habit is established before the exam.