The INRAT covers 13 subject categories. Transport Canada doesn't publish how many questions come from each one, which means most candidates go in without knowing where their time is best spent. Here's what each category actually tests and where people tend to lose marks.
The 13 categories
1. Air Law and Airspace high frequency
CARs, airspace classifications, rules of the air, and IFR-specific regulatory requirements. Questions here tend to be straightforward if you've read the relevant sections of the CARs — the tricky ones usually involve specific IFR clearance rules or ATC authority. This category shows up consistently across every exam.
2. Meteorology high frequency common loss area
Weather theory, icing conditions, turbulence, GFA interpretation, and TAFs. Meteorology is one of the heavier categories on the exam and one of the most commonly failed. GFA reading in particular trips people up because it requires actually practicing with real charts, not just reading about them. If you're not spending time on GFAs during prep, you're leaving marks on the table.
3. Instrument approaches high frequency
ILS, VOR, NDB, and RNAV approaches. Minimums, decision heights, missed approach procedures. This is dense material and the exam tests both theoretical understanding and the ability to read approach plates correctly. Candidates who fly a lot of actual approaches tend to do well here. Those who haven't flown much IFR recently often underestimate it.
4. Enroute and holding common loss area
Holding entries, holding procedures, enroute navigation. Holding entry geometry (direct, parallel, teardrop) is a consistent source of errors on the exam. The questions are usually scenario-based — they give you a heading, an inbound course, and a fix, and ask which entry applies. This is learnable with practice but not something you can read your way through. You need to have drawn the diagrams enough times that it's automatic.
5. Departure procedures
Standard instrument departures (SIDs), obstacle departure procedures (ODPs), and takeoff minimums. Less heavily weighted than approaches but still present. Questions often involve reading a specific departure procedure and identifying the correct action or restriction.
6. Navigation
VOR, DME, GNSS, ADF, and RMI use in IFR operations. Radial intercepts, position fixes, and navigation system errors. Most candidates with solid instrument time do fine here. It's a straightforward category if you understand how the systems work rather than just what buttons to push.
7. Human factors
Spatial disorientation, hypoxia, hyperventilation, fatigue, and aeronautical decision-making. Leans more conceptual than the other categories. Questions test whether you understand the physiological and cognitive mechanisms, not just the symptoms. Easier to prepare for than it looks — the TP 691E covers it well.
8. Instrument systems
Pitot-static system, gyroscopic instruments, magnetic compass, and their failure modes. Questions often involve identifying which instruments are affected by a specific failure (blocked static port, failed vacuum system, etc.) and what indications the pilot would see. Common gotcha: the altimeter and airspeed indicator both use static pressure — block the static port and both are affected.
9. Flight planning
IFR flight plan requirements, fuel planning, alternate aerodrome selection and weather minimums, NOTAM interpretation. Canada-specific requirements here differ enough from FAA rules that any FAA-based study material will mislead you. Alternate minimums in Canada are calculated differently than in the US.
10. Communications
IFR phraseology, clearance readback requirements, position reporting. Most candidates find this straightforward — the language follows patterns and the exam tests whether you know the correct format for specific communications. Studying real ATC transcripts alongside the regulatory requirements helps.
11. Two-way comm failure common loss area
7600 squawk procedures, what to do when you lose radio contact in IMC, clearance adherence rules. This category intimidates people and gets skipped during study. That's a problem because the questions are specific and procedural — there's a correct sequence of actions, and the exam tests whether you know it. Spending two focused hours on this category is usually enough to get it solid.
12. Aeronautical charts common loss area
LO chart reading, approach plate interpretation, TAC charts. Like GFAs, you can't study this passively. You need to spend time with actual charts. The exam questions involve reading specific chart elements and answering questions about what they mean or require. Candidates who've only read descriptions of charts (rather than working through actual charts) often struggle here.
13. Aircraft performance
Density altitude, weight and balance, performance chart interpretation. Usually straightforward for candidates with solid PPL foundations. The IFR-specific wrinkle is understanding how performance changes in IMC conditions and how to apply performance data to IFR operations specifically.
Where to focus your prep time
If you're building a study plan, prioritize the categories marked as high frequency or common loss areas above. In practice, that means spending the most time on Meteorology (especially GFAs), Instrument Approaches, Holding Entries, Two-Way Comm Failure, and Chart Reading.
The best diagnostic is to run a set of practice questions across all 13 categories early in your prep, score yourself by category, and then study to your weaknesses. Understanding the scoring breakdown helps you know exactly how much each category costs you. You'll likely find two or three categories that are pulling your overall score down significantly. Fix those first.
See your scores by category
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