4.1 Certified Airports & the 5.6 km Rule

4.1 Certified Airports & the 5.6 km Rule

Quick Answer: Without proper authorization and procedures, stay at least 5.6 km (3 NM) from the centre of a certified airport. Advanced pilots may operate closer only under the applicable Part IX rules and procedures (CAR 901.47, 901.73 themes). Within 5.6 km of a military aerodrome, obtain DND permission. Convert carefully: 3 NM ≈ 5.6 km; do not invent a different number from fence-line or runway-threshold measuring tricks.

Aerodrome proximity is one of the highest-yield Air Law / Aerodromes topics on the Transport Canada RPAS Advanced exam. Candidates who know airspace classes but forget the numeric standoff from certified airports and military aerodromes lose easy marks—and, in the field, create genuine mid-air risk with fast jet and instrument traffic.

What the rule protects

Certified airports concentrate the busiest, fastest, and least flexible crewed traffic in the Canadian system. Around those airports you should expect:

• Jet and turboprop traffic on departure and arrival paths with high groundspeeds and limited ability to see or avoid a small multirotor
• Instrument approach corridors where crews are heads-down on procedures, not scanning for recreational drones
• High closure rates—aircraft closing several kilometres per minute, so a drone that looked "far away" becomes a conflict in seconds
• Circuit, missed-approach, and go-around geometry that extends well beyond the paved runway surface
• Emergency and priority traffic that cannot accept unexpected obstacles in the climb or final segment

The 5.6 km (3 NM) ring is therefore a safety buffer and operating privilege boundary, not a suggestion for courtesy. Treat it as a hard planning constraint on every site survey near an airport.

The baseline standoff: 5.6 km / 3 NM

Transport Canada’s Advanced operations guidance and the Part IX aerodrome-proximity scheme share a public-facing memory item every Advanced candidate must own:

Measure from the centre

Exam and field traps often redefine the measurement point. The standard teaching answer for the published standoff is distance from the airport centre, not:

• The chain-link fence at the property line
• The control tower base alone
• The threshold of the nearest runway
• The edge of the parking lot where you staged the vehicle
• A random pin you dropped on a consumer map without verifying against an official chart or aerodrome data

If you measure from the fence, you may already be inside the 5.6 km centre-based ring while believing you are outside it. Build the habit: identify the aerodrome, locate centre reference from reliable aviation data (CFS/chart products and approved planning tools), then measure horizontal distance to your planned operating site.

Kilometres versus nautical miles (exam trap)

Both units appear on Transport Canada materials. You must recognize them as the same distance, not two different rules:

• 3 nautical miles (NM) ≈ 5.6 kilometres (km)
• 1 NM ≈ 1.852 km → 3 × 1.852 ≈ 5.556 km, commonly rounded to 5.6 km in RPAS teaching

Classic distractors:

1. Treating 5.6 km and 3 NM as different standoffs and picking "the larger one" as if both apply independently
2. Converting with statute miles (1 NM ≠ 1 statute mile)
3. Using 5 NM (a common control-zone radius ballpark) as if it were the RPAS airport standoff
4. Using the 1.9 km / 1 NM heliport figure for a certified airport (or vice versa)

Drill the pair until automatic: airport → 5.6 km / 3 NM; heliport → 1.9 km / 1 NM (next section).

Advanced privileges: closer operations are conditional

Holding a Pilot Certificate – Advanced Operations does not mean you may freely orbit the runway threshold. Advanced status is the eligibility gate that lets you use pathways for operations at or in the vicinity of an aerodrome, airport, or heliport when the rules and procedures for that flight are met.

Two Part IX themes you will see repeatedly:

CAR 901.47 — operations at or in the vicinity of an aerodrome / airport / heliport

901.47 addresses RPAS operations at or in the vicinity of an aerodrome, airport, or heliport. Conceptually it is the "you are in the shared aviation environment" rule family: you must integrate with aerodrome traffic awareness expectations, applicable procedures, and any authorizations the situation requires. It is not a blank cheque to ignore standoff distances; it is the framework that says proximity operations are regulated and must be conducted under the correct conditions.

CAR 901.73 — advanced operations procedures near those environments

901.73 (advanced operations context) reinforces that closer or higher-privilege work near aerodromes is tied to procedures, pilot qualification, and compliance with the broader Advanced operating set—including controlled-airspace authorization when the airport sits under controlled airspace (common for certified towered airports).

Operational translation for site planning:

1. Identify whether the site is inside 5.6 km of a certified airport centre.
2. If outside, the airport standoff itself is not the binding constraint (other airspace, people, and Class F rules may still bind).
3. If inside, do not launch on Advanced certificate alone. Confirm:
   • Required authorizations (for example NAV CANADA RPAS Flight Authorization when in controlled airspace)
   • Applicable 901.47 / vicinity compliance and local procedures
   • Aircraft declarations if the privilege set demands them for other reasons (controlled airspace, people, etc.)
   • Site survey, NOTAMs, and traffic pattern awareness
4. Document who authorized what and under which conditions before wheels-up (props-up).

Exam formulation: Advanced may fly closer than 5.6 km only with proper authorization and procedures—never as unrestricted approach.

Military aerodromes: DND permission within 5.6 km

Military aerodromes add a sovereign and security layer on top of pure traffic risk. Within 5.6 km of a military aerodrome, Advanced (or any) RPAS operations require permission from the Department of National Defence (DND) as framed in Transport Canada Advanced guidance. Civilian pilot certificates, civilian ATC habits, and municipal film permits do not replace DND permission.

Why the special treatment:

• Military traffic may include high-performance aircraft, tactical patterns, and security-sensitive operations
• Access and overflight near defence facilities are controlled for national security as well as safety
• Controllers and range authorities may not accept civilian drones in the same way a civil Class D tower accepts authorized RPAS traffic

Site-survey checklist item: if the aerodrome is military (or dual-use with military control relevant to the ring), treat DND permission as a go/no-go gate inside 5.6 km, independent of whether you already hold Advanced and a NAV Drone authorization for nearby civil airspace.

Certified airport vs "any grass strip"

The 5.6 km / 3 NM figure is taught against certified airports (and the parallel military-aerodrome distance for permission). Not every landing site in Canada is a certified airport. Uncontrolled aerodromes, water aerodromes, and heliports have different proximity concepts (Section 4.2). Do not apply the airport number to every paved surface on Google Maps, and do not ignore a certified airport because your client called the site "just a field next to the industrial park."

Use official aerodrome identification (CFS, charts, NAV CANADA products) to classify the facility before you pick a standoff number.

Risk logic you can recite under exam stress

If a scenario asks why the standoff exists, answer with operational physics, not slogans:

Right-of-way culture still applies: crewed aircraft have priority; RPAS must not create a hazard. The standoff is how the regulation keeps unprepared operations out of that high-consequence volume.

Pre-flight decision sequence (airport)

1. Locate all certified airports and military aerodromes near the job.
2. Measure horizontal distance from airport centre to the planned operating area.
3. Convert/check units: confirm whether planning tools show km or NM and that you still meet 5.6 km / 3 NM.
4. Classify civil certified vs military.
5. If ≥ 5.6 km and no other constraint—continue other airspace/people checks.
6. If < 5.6 km civil certified—Advanced pathway only with authorization + procedures (901.47 / 901.73 context); obtain controlled-airspace authorization if applicable.
7. If < 5.6 km military—obtain DND permission before flight.
8. Brief the crew on traffic, abort points, and lost-link paths that do not drift toward final approach.

Common exam traps for this section

• Fence-line measurement instead of centre
• Heliport 1.9 km answer on an airport scenario
• "Advanced means free inside 5.6 km" without authorization/procedures
• Ignoring military DND permission
• km/NM mismatch (for example, treating 5.6 NM as the rule)
• Confusing control-zone radius (~5 NM typical Class D teaching ballpark) with the 3 NM / 5.6 km RPAS standoff

Master the centre-based 5.6 km / 3 NM pair, the conditional Advanced closer-ops story, and the military DND gate, and this section becomes a reliable scoring block on the written exam.