# Safety
## Operational Hazards
### High voltage
Beware of tether cable and Air Unit during operation
Assume everything has high voltage when Ground Unit main breaker is on.
### Hot Surface
Beware of Light panels and Air unit.
### Bright Light
Beware of bright light while being under the drone.
## Potential In-Flight Disruptions
Pilots should be aware of potential disruptions in-flight, and be prepared to take appropriate actions
| Disruption | Cause | Resolution |
| ---------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Tether overcurrent** | When tether over currents, it may shut down, and Flying Sun will rely on a single SL8. AMC will announce "battery failsafe", and tether ground unit will alarm. | In the event of tether overcurrent, aircraft will return to launch after a 5 second hold. During which pilot can switch to position mode and land manually if they choose so. |
| **Tether overextension** | Total tether cable length is 110m, Ground Unit alarm will sound once system detects extension over 90m. This alarm will shut off once cable extension length becomes less than 90m. | In the event of tether overextension, slowly fly back towards the tether until tether alarm stops. |
| **Tether oscillation** | Tether ground unit actively keeps cable tension by regulating the retraction torque. Tether Ground Unit stops | In the event of tether oscillation, fly closer to the Ground Unit ensuring the drone is within the tether zero point, or fly further from the Ground Unit ensuring cable tension. The worst thing a pilot can do is to do nothing and hover still. |
| **Power source shutdown** | If the power source of the tether ground unit shuts down, the tether will stop supplying high voltage to the aircraft, aircraft will rely on a single SL8. At the same time tether Ground Unit will sound a beeping alarm. | In the event of power source shutdown, aircraft will return to launch after a 5 second hold. During which pilot can switch to position mode and land manually if they choose so. |
| **Flying Sun App losing connection to tether** | It's important to monitor the tether output power in flying sun app during flight, in some instances the app may lose connection to the tether. | If this occurs, point the Pilot Pro towards the tether and wait for reconnection. |
| **Tether entanglement** |
While flying a tether drone, always be aware of the tether cable.
Avoid flying over tall obstacles
Avoid flying near trees
Notify other pilots of your tether
|
In the event of tether entanglement:
Turn off HV via Flying Sun app
Turn off Ground Unit main breaker and backup power
Fly FS500 away from the obstacle
Attempt to land
If landing is impossible, make sure no one is under the drone and press the kill switch on pilot pro
Contact Freefly and tell us about your experience
|
| **Raining** | FS500 is powered by a high voltage tether that should not be used in the rain | In the event of rain, please land and shutdown high voltage immediately. |
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