Air Law & Airspace is the largest category on the INRAT — 95 questions in the pool, more than any other section. Airspace classifications alone account for a significant chunk of those. If you're treating this as a skim-and-move-on topic, you're giving up marks you could be keeping.
Canadian airspace uses the ICAO classification system — Classes A through G — but how Canada implements each class differs from both the US and other ICAO member states. Don't rely on FAA knowledge here.
Class A
Class A airspace in Canada exists from 18,000 feet ASL to FL600. All operations require IFR clearance. VFR flight is not permitted. ATC separation is provided to all aircraft. This is the High Level airspace where jet routes operate.
Class B
Class B runs from 12,500 feet ASL up to but not including 18,000 feet ASL. Both IFR and VFR aircraft are permitted, but all require ATC clearance and are provided separation. Think of it as controlled airspace with full participation required from everyone in it.
Class C
Class C surrounds most major Canadian airports with significant IFR traffic. IFR aircraft receive separation from all other aircraft. VFR aircraft need a clearance and receive traffic information, but ATC does not provide separation between two VFR aircraft in Class C — that's on the pilots.
Class D
Class D typically surrounds airports with a control tower but lower traffic volumes than Class C airports. IFR aircraft are separated from other IFR aircraft. VFR aircraft need a clearance to enter but receive only traffic information — no separation from ATC. Both IFR and VFR must establish two-way communication before entry.
Class E
Class E is controlled airspace that doesn't fit the other controlled categories. In Canada, Class E includes low-level airways (from 2,200 feet AGL to 17,999 feet ASL along defined routes) and transition areas around some airports. IFR aircraft in Class E receive ATC separation. VFR aircraft can operate without a clearance but must meet IFR and VFR weather minimums including visibility and cloud clearance requirements.
Low-level airways and high-level airways both exist in Class E — an important distinction for chart reading questions on the INRAT.
Class F
Class F is unique to Canada. It covers special use airspace — restricted, advisory, and danger areas. The designator tells you what it is:
- CYR — Restricted area. Entry requires permission from the controlling authority. The exam will give you a CYR designator and ask what's required to enter.
- CYA — Advisory area. Activity is occurring that pilots should be aware of. Entry is permitted but caution is advised.
- CYD — Danger area. Hazardous activities may be occurring. Not prohibited, but the pilot accepts responsibility.
Class G
Class G is uncontrolled airspace — everything that isn't classified as A through F. No ATC clearance is required, and ATC does not provide separation. IFR flight is permitted in Class G, but the pilot is responsible for terrain and traffic separation. This surprises a lot of candidates — IFR doesn't require controlled airspace. It's also one of the few situations where an IFR flight plan is not required — once you enter controlled airspace, that changes.
Canadian airspace classification — quick reference table
This table covers the core of what the INRAT tests on Canadian airspace classification. Print it, memorize it, then test yourself on the exceptions.
| Class | Altitude (typical) | IFR clearance | VFR clearance | ATC separation |
|---|---|---|---|---|
| A | 18,000 ft ASL – FL600 | Required | Not permitted | All aircraft |
| B | 12,500 ft – 17,999 ft ASL | Required | Required | All aircraft |
| C | Around major airports | Required | Required | IFR from all; VFR/VFR — traffic info only |
| D | Around tower airports | Required | Required | IFR from IFR; VFR — traffic info only |
| E | Low-level airways, transitions | Required | Not required | IFR from IFR only |
| F | Special use (various) | Depends on type | Depends on type | Advisory only (FA) |
| G | All other airspace | Not required | Not required | None |
Canada vs. US airspace classification
Canadian airspace classification follows ICAO, but it is not the same as US airspace. The differences catch candidates who've done FAA ground school or studied American resources:
- Canada has Class B from 12,500 to 18,000 ft ASL — in the US, Class B is around busy terminal areas near the surface
- Canada has Class F for special use airspace — the US does not use Class F
- The US has Class B, C, D near airports — Canada uses Class C and D differently, based on traffic volume and services
- Canadian Class G allows IFR operations — this is the same as the US, but it surprises pilots trained on Transport Canada VFR material
If you're using any American study material for your INRAT, the airspace section will actively mislead you. Canadian airspace classification has to be learned from Canadian sources.
What the exam actually tests
Memorizing the classifications is the starting point. The INRAT goes further. It asks about equipment requirements for each class, what separation services are provided, what happens when a VFR aircraft enters without clearance, and how airspace is depicted on LO and VTA charts.
The most common errors: confusing Class C and Class D separation rules, misidentifying Class F designators, and assuming Class G doesn't allow IFR. Work through the full category list — Air Law questions often combine airspace knowledge with CARs regulatory requirements in a single question.
One thing worth noting: the INRAT uses the term airspace classification and airspace classes interchangeably. Some questions will describe a scenario and ask you to identify the airspace class — others will name a class and ask what services or requirements apply. Both directions show up on the exam.
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