# Failsafe

FlytBase offers a number of failsafe mechanisms to aid in safe and controlled emergency landings in events where vehicle control is lost.

* Once the drone has been added and is online on the dashboard, click on **Settings** from the right corner of the screen.

<figure><img src="https://2978718896-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGYYKeStDMySe3v9HDpIo%2Fuploads%2FWFNEaxjAP6ihnIrpBHTx%2Fimage.png?alt=media&#x26;token=4187f7dc-cec7-433f-a7cd-6e410b1a6471" alt=""><figcaption><p>Settings</p></figcaption></figure>

* In **Settings**, select a drone from the drop-down box at the top left corner. Now, click on **Failsafe** to view and configure failsafe settings.

<figure><img src="https://2978718896-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGYYKeStDMySe3v9HDpIo%2Fuploads%2FeraqqHChoB6Luxrc0urW%2Fimage.png?alt=media&#x26;token=44770c97-e9eb-419c-baee-6e0141715201" alt=""><figcaption><p>Failsafe settings for the selected drone</p></figcaption></figure>

## **Failsafe Actions**

This table is an outline of the available failsafe events and their behaviors. Users can set the failsafe actions and trigger values (time/percentage) as per their flight environments.

<table><thead><tr><th width="210">Failsafe Event</th><th width="180">Behavior </th><th width="219">Reason </th><th>Actions</th></tr></thead><tbody><tr><td>Low Battery Failsafe</td><td>The drone will perform the set action when the drone's battery percentage drops below the specified configurable threshold.</td><td>It is to prevent the drone from crashing or getting lost due to a depleting battery. When the battery level drops to the set battery failsafe percentage, the failsafe is triggered. This prevents the drone from reaching critical battery far from home/Docking Station. But when action is set to "<strong>No Action" then the drone will continue the mission.</strong></td><td><p>RTH/RTSL</p><p>RTDS<br>Land<br>No Action</p></td></tr><tr><td>Critical Battery Failsafe</td><td>The drone will Land when the drone's battery percentage drops below the specified configurable threshold.</td><td>It automatically initiates the landing process when the battery level reaches a critical level, as the drone's battery is too low to perform any action. This ensures that the drone doesn't run out of power mid-flight, potentially causing damage or harm to the drone and the surrounding.</td><td>Land</td></tr><tr><td>Drone LTE Link Loss</td><td>The drone will perform the set action if the network connectivity on the device running the FlytBase Mobile Application or FlytOS is lost for the specified configurable threshold.</td><td>This occur because distance from the drone to the LTE network tower, environmental interference, signal obstruction, or hardware issues, contribute to the loss of LTE link.</td><td>RTH/RTSL<br>Land<br>Hover<br>FN-RTH<br>No Action</td></tr><tr><td>RC Link Loss</td><td>The drone will perform the set action if the connection between the drone's RC and the drone's autopilot is lost.</td><td>It can be due to interference from other radio frequencies or obstacles in environment, or RC reaches low battery, or is out of range. Therefore, it is important for the operators to maintain a strong RC link with the drone in order to maintain control.</td><td>RTH/RTSL<br>Land<br>Hover<br>No Action</td></tr><tr><td>FlytBase Link Loss</td><td>The drone will perform the set action if there is a weak internet network connectivity on the  FlytBase web page or is closed on the device while running the mission.</td><td>Occurs when the FlytBase dashboard is no longer connected cloud through the internet. As the operator loses visibility and drone controls when their dashboard is disconnected, this failsafe event becomes crucial.</td><td>RTH/RTSL<br>Land<br>Hover<br>No Action</td></tr><tr><td>FN Low Battery</td><td>The drone will avoid NFZs in its path while performing RTH when the drone's battery percentage drops below the configured low battery. This setting is available for <a href="../../add-ons/no-fly-zones-nfz">NFZ</a> only.</td><td>It is to prevent the drone from crashing or getting lost due to a depleting battery. When the battery level drops to the set battery failsafe percentage, the failsafe is triggered. This prevents the drone from reaching critical battery far from home/Docking Station. But when action is set to "<strong>No Action" then the drone will continue the mission.</strong></td><td><p>FN-RTH</p><p>No Action</p></td></tr><tr><td>Precision Landing Timeout</td><td>The drone will perform the set action if it is unable to detect the Precision Landing tag or maintain its position over the tag till the specified configurable threshold.</td><td>When the drone is unable to precisely detect the tag while hovering over or sustain its position over the tag leads to the drone failing to land in the docking station/ home location and this triggers the Precision Landing Timeout fail safe.</td><td>Hover<br>Preset Landing Location/ RTSL</td></tr></tbody></table>

## **Failsafe Actions**

This table outlines the available failsafe actions and their behaviors. Users can set the failsafe actions as per their flight environments.

| Failsafe Action                  | Behaviour when Action is executed                                                                                                                          |
| -------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Return To Home (RTH)             | The drone will proceed to its home location and land.                                                                                                      |
| Land                             | The drone will land at it's current location.                                                                                                              |
| No Action                        | The drone will continue with it's set actions.                                                                                                             |
| Return To Docking Station (RTDS) | The drone will proceed to the marked Docking Station Location to precisely align, approach, and land on the ArUco Tag on the Docking Station.              |
| Return to Safe Location (RTSL)   | The drone will proceed to the marked Safe Location and land.                                                                                               |
| Hover                            | The drone will hover at its current location and the user is required to take back manual control of the drone from the FlytBase dashboard or from the RC. |
| Preset Land Location             | The drone will proceed towards a predetermined location set by the user and land there.                                                                    |

### Failsafe Actions Expected Behaviors

{% hint style="success" %}

#### Low Battery Failsafe

When Low Battery Failsafe has already been triggered and takeoff is given, the vehicle will take off to the set take-off altitude (1.2m for DJI drones) and land immediately.

#### Critical Battery Failsafe

When Critical Battery Failsafe has already been triggered and take-off is given, the vehicle will not take off.

#### **Drone LTE**&#x20;

* The vehicle will continue with the set Failsafe action even after the connection is regained.

#### **FlytBase Link Loss**&#x20;

* If the FlytBase Link Loss trigger value is set for less than 10 seconds, then FlytBase Link Loss Failsafe will get triggered even if there is no loss in connection.

#### RC Link Loss

* **For FlytBase SBC** -  The failsafe will get triggered when the drone loses RC connection till the set trigger value.
*

```
**For FlytBase Mobile** - RC Link Loss Failsafe trigger value can’t be set and failsafe will get triggered immediately or after 4 to 7 seconds when the vehicle loses RC connection.
```

#### RTH/RTSL/RTDS

* All the limitations/conditions that apply to the RTH for that particular drone model do apply to the drone during RTH/RTSL/RTDS as well.
* For DJI Mavic 2 series drones (including the enterprise series) the behaviour is as described in the DJI manual. FlytBase enables the **RTH at current altitude** option in DJI settings.
  * The drone will travel at the current altitude to the home (safe) location if the distance between the drone and the home (safe) location is more than 5m and less than 20m.
  * The drone will land at the current location if the drone is less than 20m away from the home (safe) location.
  * The drone will achieve the RTH altitude if the current location is more than 20m and the current altitude is below the RTH altitude level.
  * The drone will proceed to the home (safe) location if the current location is more than 20m and the altitude is higher than the RTH altitude level.
  * The drone may gain altitude if the drone senses any obstacles during RTH. Please read the DJI product manual for detailed information.

#### Preset Land Location

The drone will descend from its current altitude will attain the altitude set in the Precision Landing Timeout settings and will proceed to the Preset Land Location.
{% endhint %}

{% hint style="info" %}
Failsafe Actions can be aborted by clicking **Abort**<img src="https://2978718896-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGYYKeStDMySe3v9HDpIo%2Fuploads%2FNb4LdKnvFsBD46AMg8Rz%2FPause.png?alt=media&#x26;token=6b29e8d4-0bc4-4f45-aef7-593177886c9b" alt="" data-size="line">after the connection is regained for Drone LTE link loss, RC link loss & FlytBase link loss.
{% endhint %}