Norway ATPL Theory common mistakes
Norway ATPL Theory · Understand the traps and how to avoid them.
On mass-and-balance questions, calculating the take-off mass and CG position but stopping there, without re-checking that the CG stays inside the forward and aft limits for landing after fuel burn, or without converting the moment arm units the way the question's loading chart expects.
Candidates learn one 'load sheet' routine (sum masses, sum moments, divide) and apply it mechanically. They forget that the CG moves as fuel is burned and that some items (fuel, crew) sit at stations whose arm must be read from the given data rather than assumed. Unit slips (kg vs lb, inches vs metres, index units vs moment) then survive into the final answer.
What to do instead
Build a fixed four-line table for every M&B item: mass, arm, moment, and cumulative total. Do the arithmetic twice with the units written next to every number. Then explicitly compute the landing CG using landing fuel and compare both take-off and landing CG against the envelope. Practise with the actual loading-manual style tables the exam uses, including index-unit charts, until reading the arm from the table is automatic.
Answering performance questions with a single 'book' figure (e.g. take-off distance) taken straight from a table or graph, ignoring the corrections the question actually demands: pressure altitude vs field elevation, temperature deviation from ISA, wind component, runway slope, and contaminant or wet-runway factors.
The graph or table gives one number and it feels like the answer. Candidates under time pressure skip the sequence of corrections, or apply them in the wrong order, or use QNH instead of pressure altitude. Slope and wind corrections are frequently forgotten entirely because they are 'small'.
What to do instead
Adopt a rigid correction order and write it on your scratch paper before starting: field elevation + QNH → pressure altitude; then temperature → density altitude effect; then wind component (headwind/tailwind, with the tailwind penalty often larger than the headwind credit); then slope; then surface condition. Rehearse on the specific AFM/POH-style charts the syllabus uses until each correction is a reflex, and always sanity-check that a tailwind or upslope makes the answer worse.
Mixing up QNH, QFE, QNE and the transition altitude/level rules: setting QNE below the transition altitude, or failing to reset the altimeter to standard pressure when climbing through the transition altitude, and mis-stating the altimeter reading (altitude vs height vs flight level) in the answer.
The three pressure settings look similar and the rules are procedural, not intuitive. Candidates memorise 'QNH = altitude, QFE = height' but not when each is used, and forget that the transition altitude varies by aerodrome while the transition level varies with pressure. Exam questions deliberately test the boundary case.
What to do instead
Write one sentence you can recite: below the transition altitude the altimeter is set to QNH (or QFE for approach), at or above the transition altitude it is set to 1013.2 hPa and you fly flight levels. Learn that transition level = transition altitude adjusted for the current QNH and is therefore not fixed. Practise ten 'what does the altimeter read and what do you set' scenarios, including climbing and descending through the transition, until the boundary is unambiguous.
On flight-planning and fuel questions, computing trip fuel only and forgetting the reserve structure (contingency, alternate, final reserve, additional/extra fuel), or computing endurance from the wrong fuel figure, or mixing TAS/ground speed when converting distance to time.
Trip fuel is the visible, obvious number. The reserves are defined by regulation and are easy to collapse into one lump or omit. Candidates also forget that time en route uses ground speed (wind-corrected), not TAS, and that the alternate fuel is computed to the alternate at a specified altitude and configuration.
What to do instead
Memorise the fuel policy as a named list and apply it in order every time: taxi → trip → contingency (percentage of trip or specified time) → alternate → final reserve → additional. For every leg, state the ground speed you are using and show the wind triangle. Do timed drills converting distance/speed to time with a wind correction so the TAS-vs-GS distinction becomes automatic.
Confusing indicated, calibrated, true and equivalent airspeed, and the position/installation and compressibility errors behind them, so that a question about 'what the pilot reads' is answered with a TAS figure or vice versa.
The four speeds are taught together and the correction chain (IAS → CAS via position/installation error → EAS via compressibility → TAS via density) is easy to blur. Candidates also forget that TAS increases with altitude for a given IAS, and that Mach number depends on temperature, not just pressure.
What to do instead
Draw the correction chain once and keep it: IAS + position/installation error = CAS; CAS corrected for compressibility = EAS; EAS corrected for density = TAS. Attach one example number to each stage so you can see the direction of each correction. Practise questions phrased as 'the pilot reads…', 'the aircraft is actually moving at…', and 'the Machmeter indicates…' so you identify which speed is being asked before computing.
Treating stability and control questions as definitions to recall rather than applying them: for example, stating that a aft CG improves stability, or confusing static and dynamic stability, or failing to link CG position to stick force, stall recovery and spin behaviour.
The terms are abstract and candidates memorise 'positive, neutral, negative' without the physical picture. The aft-CG trade-off (less longitudinal stability, lighter stick forces, longer stall recovery) is counter-intuitive and is a favourite exam trap.
What to do instead
Anchor each concept to a physical consequence: forward CG → nose-down tendency, higher stick force, longer take-off run, better stall/spin resistance; aft CG → lighter forces, less stability, worse stall recovery. Learn static stability (initial tendency) separately from dynamic stability (subsequent motion: phugoid, spiral, Dutch roll). For each principle, write the operational consequence in one line and test yourself with 'what happens if…' questions.
Misreading meteorological reports and forecasts: decoding a METAR/TAF group by group (wind direction as true vs magnetic, visibility units, cloud base in hundreds of feet, QNH trend, TEMPO/BECMG timing) and then answering a question about the actual or expected conditions with the wrong decoded value.
The coded format is dense and the differences (e.g. 9999 visibility, CAVOK vs SKC, VRB, gust groups, BECMG vs TEMPO validity) are small. Candidates decode the wind as magnetic when METAR/TAF winds are reported in degrees true, and confuse the validity period of a change group with the whole forecast period.
What to do instead
Decode on paper in a fixed order: wind (true direction, speed, gusts, variability) → visibility → weather → cloud → temperature/dewpoint → QNH. Learn the special codes as a list (CAVOK, 9999, VRB, NSC, TEMPO, BECMG, PROB30/40) with their exact meanings. Practise decoding five real-format METARs and TAFs a day and stating the worst expected condition within each change group's validity window.
On radio-navigation questions, mixing up the behaviour of VOR, DME, ILS and NDB: reading a VOR radial as a bearing 'to' when it is a bearing 'from', mis-stating DME as slant range vs ground distance, confusing localiser and glideslope frequencies, or forgetting that an NDB gives a relative bearing that must be converted to a magnetic bearing.
Each aid has its own reference frame, and the exam deliberately tests the frame rather than the definition. The VOR 'from/to' ambiguity and the NDB relative-to-magnetic conversion are the classic errors, and candidates forget that DME measures slant range, which over-reads ground distance at high altitude and close range.
What to do instead
For each aid, write down its reference: VOR radial = magnetic bearing from the station; NDB gives relative bearing, so magnetic bearing = aircraft heading + relative bearing; DME = slant range, so ground distance is less than indicated at short range. Learn the ILS component frequencies and that the localiser is the lateral guidance and glideslope the vertical. Work through ten 'given heading and bearing, what does the instrument show' problems per aid.
Answering air-law and operational-procedure questions from general aviation intuition rather than the specific rule: for example, quoting a visibility or cloud-base minima that is not the one in the applicable rule, confusing the roles and responsibilities of commander vs operator, or mis-stating when an ATC clearance is required and what 'read-back' items are mandatory.
The rules are numerous and similar-sounding, and candidates rely on remembered 'typical' values instead of the exact regulatory figure. The distinction between what the commander decides and what the operator specifies is subtle, and read-back requirements are a short list that is easily half-remembered.
What to do instead
Keep a one-page rule sheet per topic with the exact numbers and the exact wording of responsibilities, and revise it against the syllabus rather than from memory. For each question, identify whether it asks about the commander, the operator, or ATC before choosing. Memorise the mandatory read-back items as a checklist (clearances, runway, altitude, heading, frequency, squawk) and practise questions that turn on 'who decides' and 'what must be read back'.
Rushing human-performance and communications questions by choosing the 'common sense' answer without applying the underlying model: e.g. attributing a hypoxia or decompression symptom to the wrong cause, mis-identifying the stages of a stall or the effects of fatigue, or using non-standard phraseology in a communications scenario.
These domains feel like general knowledge, so candidates answer from intuition and skip the model. Hypoxia, hyperventilation and CO poisoning share symptoms; fatigue and stress effects are easy to blur; and standard phraseology has exact forms that differ from everyday English. Time pressure at the end of the exam makes this worse.
What to do instead
Learn the symptom clusters as a comparison table (hypoxia: euphoria, cyanosis, impaired judgement; hyperventilation: dizziness, tingling, no cyanosis; CO: headache, cherry-red, no response to oxygen) and the time-of-useful-consciousness concept. For communications, memorise the standard phraseology patterns and practise reading them aloud so the exact wording is familiar. Treat these questions with the same rigour as numerical ones: identify the model, then answer.