Planning an IFR flight in Canada requires far more than selecting a route and filing paperwork. It demands a systematic integration of regulatory requirements, fuel logic, weather analysis, and contingency planning that reflects real-world operational decision-making. For INRAT students, this topic represents one of the most heavily tested areas of the exam, drawing questions from Air Law, Procedures, and Route & Flight Planning categories as defined in TP 691E. We created this guide to help you understand not just the individual planning components, but how they connect into a coherent, exam-ready framework that mirrors how professional pilots approach every IFR flight.
Who This Article Is For
This article is written specifically for Canadian pilots preparing for the INRAT written examination who need to understand the planning phase of IFR flight operations. If you are working through your instrument rating ground school and want clarity on how fuel requirements, alternate selection, route planning, and regulatory compliance come together, this content is for you.
This article is not intended for pilots seeking basic VFR planning guidance, those unfamiliar with fundamental IFR concepts, or anyone looking for FAA-specific procedures. We focus exclusively on Transport Canada requirements and Canadian IFR operations.
IFR Flight Planning for the INRAT Exam
The INRAT examination includes scenario-based questions that simulate real IFR flight planning decisions. You will encounter situations requiring you to calculate fuel requirements, select appropriate cruising altitudes, and demonstrate understanding of route structures. These questions are designed to assess whether you can apply planning principles under pressure rather than simply recall isolated facts.
Transport Canada expects INRAT candidates to demonstrate competency across several interconnected planning domains:
- Route structure and airway navigation
- Fuel calculations including reserves and contingencies
- Alternate aerodrome selection criteria
- Minimum altitude requirements and obstacle clearance
- Integration of weather products into planning decisions
- Regulatory compliance under CARs Part VI
Our INRAT Ground School course covers each of these areas with video lessons, practice questions, and detailed explanations aligned with Transport Canada’s testing standards.
IFR Flight Plan Filing Requirements
Canadian Aviation Regulations mandate that no pilot-in-command shall operate an aircraft in IFR flight unless an IFR flight plan or IFR flight itinerary has been filed. This requirement applies to all IFR operations within Canadian airspace.
When IFR Flight Plans Are Mandatory
Under CARs 602.73, an IFR flight plan must be filed before conducting any IFR operation. An IFR flight itinerary may only be used when the flight is conducted wholly or partially outside controlled airspace, or when communication facilities are inadequate to permit flight plan information transmission to air traffic services. For most instrument flights in Canada, a full IFR flight plan is required.
ICAO Format Requirements
Your IFR flight plan must contain specific elements in ICAO format:
- Aircraft identification and type
- Equipment codes indicating navigation and communication capabilities
- Departure aerodrome and proposed time
- Cruising altitude or flight level
- Route of flight including airways, fixes, and navigation aids
- Destination aerodrome and estimated time enroute
- Alternate aerodrome(s) when required
- Fuel endurance
- Persons on board and other required information
ATC Notification for Changes
Once airborne, any intended changes to your filed flight plan must be communicated to ATC as soon as practicable. This includes changes to cruising altitude, route of flight, destination, true airspeed variations exceeding five percent, or Mach number changes of 0.01 or greater. When operating in controlled airspace, you must receive ATC clearance before making the intended change. This regulatory framework ensures ATC maintains situational awareness of all aircraft under their jurisdiction.
Fuel Requirements for IFR Flights
Fuel planning represents one of the most critical and frequently tested INRAT topics. Transport Canada expects you to understand the logic behind fuel requirements rather than simply memorizing minimum numbers.
Fuel Planning
For propeller-driven aircraft operating IFR when an alternate airport is specified, the regulations require fuel sufficient to:
- Fly to the destination airport
- Execute an approach and missed approach procedure
- Fly to and land at the alternate airport
- Continue flying for an additional 45 minutes at normal cruising speed
When no alternate is required, the aircraft must carry fuel to reach the destination, execute an approach and missed approach, then continue for 45 minutes at normal cruise. Turbojet aircraft follow similar requirements but with a 30-minute reserve instead of 45 minutes.
Understanding the Fuel Logic
INRAT questions test your understanding of why these requirements exist, not just what they are. The fuel logic accounts for several operational realities:
- Holding fuel: You may need to hold at the destination awaiting clearance or improved weather
- Missed approach fuel: Initial approaches may not result in landing
- Diversion fuel: Destination weather may deteriorate below minimums
- Contingency reserves: Unexpected headwinds, routing changes, or ATC delays
When calculating fuel requirements, use your flight computer and aircraft performance charts to determine actual fuel burn rates at planned power settings and altitudes.
Alternate Aerodrome Planning
Alternate airport selection involves evaluating forecast weather against published approach minimums and assessing whether the alternate can serve its intended purpose: providing a safe landing option when your destination becomes unavailable.
Alternate Selection Criteria
Not every airport can serve as a suitable alternate. Your selection should consider:
- Published IFR approaches: The alternate must have an approach procedure compatible with your aircraft equipment
- Forecast weather: Standard alternate minimums require 600-foot ceiling and 2 statute miles visibility for precision approaches, or 800-foot ceiling and 2 statute miles for non-precision approaches
- Lighting and runway availability: Night operations require appropriate lighting systems
- Facility suitability: Fuel availability, services, and runway length for your aircraft
- Terrain and weather patterns: Choose alternates in different weather systems when conditions are deteriorating along your route
Interpreting Weather for Alternate Acceptability
You must be able to read TAFs and METARs to determine whether a proposed alternate meets regulatory requirements at your estimated time of arrival. Remember that legal alternate minimums represent minimum requirements. Establishing personal minimums that exceed regulatory thresholds provides an additional safety margin, particularly when you are building instrument experience.
Minimum Enroute Altitudes and Obstacle Clearance
Understanding minimum altitude designations is essential for safe route planning and frequently appears on the INRAT examination. Each altitude type serves a specific purpose and applies under different conditions.
Key Altitude Definitions
- Minimum Enroute Altitude (MEA): The lowest published altitude between radio fixes that ensures navigation signal coverage and meets obstacle clearance requirements. This is the altitude most commonly flown during IFR operations.
- Minimum Obstruction Clearance Altitude (MOCA): The lowest published altitude that meets obstacle clearance requirements for the entire route segment.
- Minimum Reception Altitude (MRA): The lowest altitude at which reliable navigation signal reception can be established for determining intersections.
Hemispheric Rule for Cruising Altitudes
IFR cruising altitudes in Canada follow the hemispheric rule based on magnetic track. Aircraft on magnetic tracks from 000° through 179° fly at odd thousands of feet (3,000, 5,000, 7,000, etc.). Aircraft on magnetic tracks from 180° through 359° fly at even thousands of feet (4,000, 6,000, 8,000, etc.). This rule applies to all IFR aircraft.
Scenario-Based Altitude Selection
INRAT questions often present scenarios requiring you to select appropriate altitudes considering terrain, navigation aid coverage, and regulatory requirements. You must be able to identify the MOCA, MEA, and how to interpret minimum crossing altitudes that apply to specific fixes.
SIDs, STARs, and Enroute IFR Routing
Standard Instrument Departures and Standard Terminal Arrival Routes are integral to your planning process and affect fuel calculations, altitude selection, and routing decisions.
SIDs and STARs in Planning
When planning an IFR flight, you must consider:
- Required climb gradients: SIDs often specify minimum climb rates. If your aircraft cannot meet these requirements, you cannot accept that departure procedure.
- Transition points: How does the SID connect to the enroute structure? What fix or airway does it transition to?
- STAR selection: Which arrival procedure is appropriate for your destination runway and aircraft capabilities?
- Fuel implications: Some procedures involve significant altitude and distance variations that affect fuel burn
Route Structure and Mandatory Routing
Where mandatory IFR routes have been published for specific city pairs, consider these routes for your flight. Mandatory routes typically offer efficient routing that ATC expects and can process without delays. For flights without published preferred routes, you may plan direct using GPS navigation, but ensure adequate terrain clearance when departing from established airways.
The Canada Flight Supplement contains mandatory routing information and general planning instructions that support efficient route selection.
Navigation Aids in IFR Planning
While our separate article on navigation aids covers system theory in detail, your planning process must account for NAVAID availability and compatibility with your aircraft’s equipment.
Selecting Navigation Aids for Your Route
When planning an IFR flight, ensure that:
- Selected NAVAIDs are operational (check NOTAMs)
- Your aircraft equipment can receive and utilize the planned navigation facilities
- Backup navigation options exist if primary facilities become unavailable
- Enroute charts confirm adequate navigational coverage for your entire route
Equipment Status Considerations
NOTAMs may indicate partial NAVAID unserviceability. Your planning must account for these limitations and determine whether your flight can proceed safely with reduced navigation capability.
Weather and NOTAM Integration
INRAT students are tested on applying weather data to planning decisions, not just decoding formats. You must understand how TAFs, METARs, and GFAs influence your route, fuel, and alternate selections.
Weather Products in Route Planning
Use the following products for comprehensive weather analysis:
- TAF: Aerodrome-specific forecasts for destination and alternate airports
- METAR: Current conditions for departure planning and trend analysis
- GFA: Area forecasts showing clouds, icing, turbulence, and frontal positions
- Upper winds: For groundspeed and fuel calculations at cruising altitude
- PIREPs: Real-world reports of conditions actually encountered
NOTAM Integration
Your planning must incorporate NOTAMs addressing:
- Aerodrome closures or restrictions
- NAVAID unserviceability affecting your route
- Approach procedure limitations
- Runway or taxiway closures at destination and alternate
- Airspace restrictions or special activity areas
Canadian IFR Planning Publications
Effective IFR planning requires proficiency with several NAV CANADA IFR publications that work together to provide complete planning information.
Essential Documents
- LO/HI Enroute Charts: Airways, MEAs, MOCAs, fixes, navigation aids, and airspace boundaries
- CAP (Canada Air Pilot): SIDs, STARs, instrument approach procedures
- CAP GEN: Provides aeronautical information primarily related to the IFR flight
- CFS (Canada Flight Supplement): Mandatory routes, airport-specific details including services, frequencies, and runway data
Publication Currency
All IFR publications follow a 56-day update cycle. Using outdated publications for planning creates both safety and regulatory compliance issues. Ensure your charts and procedures are current before every IFR flight.
Cross-Referencing Procedures
Complete planning requires cross-checking information across multiple documents. Your enroute chart provides airway structure, but you must reference the CAP for terminal procedures and the CFS for airport-specific details. This integrated approach ensures no planning element is overlooked.
Aerodrome Data and Planning Logic
Aerodrome Suitability Factors
- Available lighting systems: Affects approach minimums and night operations
- Published approaches: Must match your aircraft equipment capabilities
- Runway length and surface: Must accommodate your aircraft type
Lighting Effects on Minimums
Approach lighting systems directly affect published minimums. Airports with full approach lighting may have lower minimums than those with limited or no approach lights. When selecting alternates, consider whether available lighting supports the minimums you need for your planned arrival time.
ATC Services and Planning Boundaries
A fundamental concept that INRAT candidates must understand: ATC provides clearances and routing assistance, but they do not make fuel, performance, or legality decisions for you.
Pilot Responsibilities
Even when operating under ATC control, you remain responsible for:
- Filing a valid and complete flight plan
- Ensuring adequate fuel for the flight including all contingencies
- Understanding the limitations of your clearance
- Maintaining navigation awareness even in radar environments
- Making go/no-go decisions based on aircraft capability and weather
ATC clearances apply only to controlled airspace. Controllers have no jurisdiction over IFR flights outside controlled airspace, and pilots cannot operate IFR in controlled airspace without holding a clearance to do so.
Building Your Planning Competency
Planning IFR flights in Canada is more than filing a route. It requires integrating fuel logic, navigation infrastructure, weather analysis, and contingency thinking into a coherent decision-making process. The INRAT tests not only what you know, but how you apply that knowledge under pressure.
Success on the examination comes from understanding the relationships between planning elements rather than memorizing isolated facts. When you understand why fuel reserves exist, why alternates must meet specific criteria, and why minimum altitudes vary across different designations, you can work through scenario-based questions with confidence.
Our INRAT Ground School provides comprehensive coverage of all planning topics with practice questions that mirror Transport Canada’s examination format. We designed this course to give you both the theoretical foundation and practical application skills needed to succeed on your written exam and carry these competencies into your instrument flying career.
Frequently Asked Questions
When must we file an IFR flight plan for operations in Canadian airspace?
We file an IFR flight plan before every IFR flight. An IFR flight itinerary suffices only outside controlled airspace or with inadequate communications. This ensures ATC tracks us precisely, preventing the chaos of unmonitored IFR traffic.
What fuel reserves do we calculate for propeller IFR flights with an alternate aerodrome?
For propeller aircraft, we plan fuel to fly to destination, execute approach and missed approach, divert to alternate, then hold 45 minutes at normal cruise—per CARs requirements. Without an alternate, it’s destination plus an approach and missed approach plus 45 minutes. This logic covers holding delays, missed approaches, diversions, and contingencies like headwinds, mirroring real ops where we use performance charts conservatively. Turbojets get 30 minutes. INRAT tests this integration: underestimate, and exam fuel emergencies sink your score, just as they trigger ATC priorities in flight.
What minimum enroute altitudes apply, and how do we select cruising levels?
MEA guarantees nav coverage and obstacle clearance; MOCA does so as well but without the nav coverage. In IFR flight we fly odd thousands (000°-179° magnetic track) or even thousands (180°-359°).
Which NAV CANADA publications must we use for IFR planning?
We rely on LO/HI enroute charts for MEAs/MOCAs, the CAP for SIDs/STARs/approaches, the CAP GEN for aeronautical information, and the CFS for airport data—all on 56-day cycle.
