Mandatory pre-flight checklist: 15 points you cannot ignore

In this article

TL;DR:

A proper pre-flight checklist helps prevent many drone accidents
The 15 points cover hardware, software, environment, and regulations
The law requires operator registration for drones with a camera or from 250g, and civil liability insurance above 900g
Checking batteries, propellers, GPS, and firmware before each flight is mandatory
Print this checklist and always bring it with you to the field

Have you ever noticed how commercial aviation pilots follow a rigorous checklist before every flight, even after doing the same procedure thousands of times? There’s a reason for that: it works. And if it works for a Boeing 737, it works for your DJI Mini 4 Pro.

This pre-flight checklist brings together 15 points that cover everything you need to check before putting the drone in the air. With practice, you can go through all of them in less than 10 minutes.

Hardware checks (points 1-5)

1. Visual inspection of the drone

How many of you actually pick up the drone and really look at it before flying? Check the body (cracks, loose screws), motor arms (should be firm), camera and gimbal (free movement), obstacle sensors (clean), and ports (SD slot closed). This takes 30 seconds and can keep you from flying with a cracked motor arm.

2. Propeller condition

Propellers are the most neglected component. Look for marks, scratches, or chips on edges. Hold the propeller at eye level to check for deformation. Confirm they’re properly seated and the correct type — note the “A” and “B” (CW and CCW). A set of replacement props for the DJI Mini 4 Pro costs about €11. A crash from a damaged prop can cost €300.

3. Drone battery

Before each flight: minimum 80% charge (100% for long flights), physical inspection (no swelling!), clean contacts, temperature between 20-40°C. Check cycles in the app — above 200, consider replacing. A swollen LiPo battery is dangerous. Never fly with a battery showing signs of puffing.

4. Controller battery

One of the most common mistakes: checking the drone battery but forgetting the controller. Mid-flight, the controller dies and you can lose the control link. Minimum: 50% charge. If you use a phone as screen, check the phone battery too.

5. MicroSD card

Another classic: filming 20 spectacular minutes only to discover the card was full. Check: card inserted and recognized, sufficient space, adequate speed (V30 minimum, preferably a card from the manufacturer’s recommended list), and card condition (replace after 2-3 years of intensive use).

Software checks (points 6-9)

6. Updated firmware

Don’t update firmware in the field (an interrupted update can leave the drone unusable). Check at home with stable Wi-Fi. If there was a recent update, read the release notes — there may be behavior changes.

7. Compass and IMU calibration

Check if the app shows calibration warnings. If you’ve changed geographic region since your last flight, calibrate the compass. It’s not necessary to calibrate every flight, but it is necessary to verify.

8. GPS signal and satellite count

Always wait for a strong GPS lock before takeoff. Current drones use several satellite systems (the DJI Mini 4 Pro, for example, uses GPS, Galileo and BeiDou). Minimum: 10 satellites. Ideal: 14+ for Precision Landing and accurate RTH. If you can’t get a lock in 2 minutes, change position.

9. Home Point registered

Verify the Home Point was correctly registered (pin on map), the position is safe for automatic landing, and RTH altitude is set above obstacles (I recommend 40-60m). If the drone keeps the Home Point from a previous flight at another location and loses signal, the automatic return heads to the wrong place.

Environmental checks (points 10-12)

10. Weather conditions

Windy and IPMA (Portugal’s weather institute) are good sources. Wind: most drones handle 10-12 m/s, but don’t fly above 8 m/s if you’re a beginner. Rain: don’t fly without IP-rating. Fog: reduces visibility and confuses sensors. Temperature: below 0°C batteries lose capacity; above 40°C, overheating risk.

11. Terrain and obstacle analysis

Arrive a few minutes early. Identify trees, poles, power cables. Keep your distance from people (in A1, never fly over assemblies of people; the 30m minimum distance is an A2 rule). Avoid birds of prey and livestock. Ensure a flat, clean takeoff surface.

12. Airspace verification

The most important point. Use airspace apps to check prohibited zones (airports, military bases), restricted zones, NOTAMs, and maximum altitude (120m AGL in Open category). For individuals, fines in Portugal range from €150 to €4,000, and they are much higher for companies. Not worth risking.

Legal checks (points 13-15)

13. Registration and documentation

In 2026: operator registration mandatory for drones with camera or >250g, registration number visible on drone, A1/A3 training (free online exam, valid 5 years), A2 if operating near people (no ANAC fee at this stage), and civil liability insurance, mandatory above 900g. Always carry copies of registration and insurance.

14. Consent and privacy

If filming private property, obtain consent. Images of identifiable people require consent (GDPR). In protected natural areas, you may need additional authorization.

15. Emergency plan

Define: signal loss procedure (RTH? Hover? Land?), battery failsafe (30% normal, 40% for distant locations), emergency contact numbers, and identify 2-3 emergency landing locations. A first aid kit isn’t overkill — propellers at 6000 RPM cut.

Summary checklist

☐ Visual drone inspection
☐ Propellers in good condition and attached
☐ Drone battery charged
☐ Controller battery charged
☐ MicroSD card with space
☐ Firmware updated
☐ Compass and IMU without warnings
☐ GPS lock (min. 10 satellites)
☐ Home Point registered
☐ Weather verified
☐ Terrain and obstacles analyzed
☐ Airspace verified
☐ Registration, insurance, documentation
☐ Consent and privacy
☐ Emergency plan defined

Conclusion

I know 15 points may seem like a lot. But after internalizing this checklist, you’ll go through it almost automatically in 5-8 minutes. In Portugal, with regulation getting tighter and ANAC fines being anything but friendly, following a pre-flight checklist is not just good practice — it’s practically an obligation. Fly safe, fly responsibly, and never forget: a drone in the air is a responsibility, not just a toy.

Frequently Asked Questions

Do I really need a checklist before every flight?

Yes. Even with experience, the checklist prevents careless errors. Commercial aviation has used checklists for decades because they work. A preventable error can cost hundreds of euros or cause an accident.

How long does it take to go through the 15 points?

First few times, 10-15 minutes. With practice, 5-8 minutes. Hardware points are quick; environmental and legal ones need more attention at new locations.

What if the drone can’t get GPS lock?

Wait 2 minutes in an open area. If no lock, change position — there may be interference. Never take off without GPS unless in ATTI mode with experience.

Is insurance mandatory for drones in Portugal?

Yes, for drones with a maximum take-off mass above 900g. The obligation comes from Portuguese law (Decree-Law 58/2018, article 10), not from EU regulation 2019/947. Policy prices vary by insurer.

Miguel Santos

DroneFlyBlog

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