> For the complete documentation index, see [llms.txt](https://docs.geprc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geprc.com/01-getting-started/fpv-safety-guide/2.-pre-flight-checklist.md).

# 2. Pre Flight Checklist

Developing a solid pre-flight routine can prevent **90%** of unexpected crashes. Even GEPRC Team Pilots, who have flown thousands of packs, mentally go through these steps before plugging in every battery.

We recommend saving a screenshot of this page on your phone to check against whenever you go out to fly.

## Mechanical Check

> **Goal:** Ensure the drone's structural integrity so it doesn't fall apart in mid-air.

* [ ] **Propeller Tightness:** Gently flick all propellers with your finger to ensure the nuts are tight and the props are not loose or slipping.
* [ ] **Propeller Condition:** Check the edges of the props for severe chips or cracks.\
  *Damaged props cause severe vibrations ("Jello effect") and can even explode in mid-air.*
* [ ] **Battery Security:**
  * The **Battery Strap** must be cinched tight. The battery should not move at all if you shake the drone.
  * **CRITICAL:** Ensure the **Power Lead** (XT60) and **Balance Plug** are tucked away securely. They must **NOT** touch the rotating propellers.
* [ ] **Arms & Screws:** Quickly check if any arm screws are loose. Check the carbon fiber plates for any visible **delamination** (splitting layers) or cracks.
* [ ] **Antenna Check:** Are the Receiver and VTX antennas secure?\
  *If a VTX antenna comes loose during flight, the VTX chip can burn out instantly due to overheating.*

## System Check

> **Goal:** Ensure the "Brain" (FC) and "Senses" (Video/Control) are communicating normally.

* [ ] **Radio Battery:** Confirm your Radio Controller has sufficient charge and all switches are in their default positions (Throttle at zero, Switch in **Disarmed** state).
* [ ] **Drone Battery Voltage:** Check via OSD or a voltage checker to ensure a full charge.
  * **4S Battery:** Full charge is approx. **16.8V**.
  * **6S Battery:** Full charge is approx. **25.2V**.
  * **Per Cell:** Should be **4.20V**. If a cell is below **4.0V**, do not take off.
* [ ] **Video Feed:** Put on your goggles. Confirm the video is clear, with no abnormal static or black screen. Check if OSD data is displaying correctly (Voltage, Flight Mode).
* [ ] **GPS Lock (Essential for Long Range):**
  * If you are using **MOZ7**, **Crocodile**, or **Cinebot25 V2 (GPS Version)**.
  * **WAIT** until the satellite icon in the OSD shows **> 7 satellites**.
  * **CONFIRM** the OSD says **"GPS 3D Fix"**.
  * **CHECK** that the "Distance" data has reset to zero and the **Home Point** is updated.\
    *Warning: If you take off before getting a GPS lock, the "Return to Home" (RTH) function will fail 100%!*

## Site Assessment

> **Goal:** Ensure the flight area is safe and complies with local regulations.

* [ ] **Distance from Crowds:** Ensure no uninvolved people are within 30 meters of the takeoff point. **Strictly prohibited** to fly directly over people.
* [ ] **Signal Interference:** Look for large signal towers, high-voltage power lines, or large metal structures nearby (these will severely interfere with VTX and Radio signals).
* [ ] **Weather Conditions:** Confirm there is no rain (water is the enemy of electronics). Ensure wind speed is within the drone's capability (TinyWhoops can't handle wind; 5-inch drones are more stable).

## Ready to Fly (RTF)

> **Goal:** Final confirmation before lift-off.

{% stepper %}
{% step %}

### Placement

Place the drone on **flat, level ground**.\
(If placed on a slope or in tall grass, the gyroscope self-check might fail, preventing the drone from arming).
{% endstep %}

{% step %}

### Stand Back

Step back at least **3-5 meters** for safety.
{% endstep %}

{% step %}

### Arm

Flip the Arm switch.
{% endstep %}

{% step %}

### Idle Check

Listen to the motors. Is the sound smooth and even? Are all four props spinning?
{% endstep %}

{% step %}

### Hover Test

Gently raise the throttle to hover 1 meter off the ground. Wiggle the roll/pitch stick slightly to confirm the drone moves in the same direction as your stick inputs.
{% endstep %}

{% step %}

### Go!

If everything feels right, enjoy your flight.
{% endstep %}
{% endstepper %}

{% hint style="info" %}
💡 Post-Crash Check

If you crash and recover your drone, **DO NOT immediately re-arm and take off!** Please repeat **Mechanical Check**.

Pay special attention to:

* **Sand in Motors:** Spin the motors by hand. If you feel resistance or hear a "gritty" scratching sound, **do not fly**. Forcing it to spin will burn out the motor coating.
* **Battery Condition:** Is the battery deformed, puffed, or punctured? (Damaged batteries are a fire hazard—**dispose of them immediately**).
  {% endhint %}