> For the complete documentation index, see [llms.txt](https://docs.freeflysystems.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.freeflysystems.com/flying-sun/maintenance.md).

# Maintenance

#### Tether cable 

Avoid stepping on tether cable.

If the tether cable is bent at a sharp angle, the wire can stick out the Kevlar sheath. Make sure to straighten any bent sections before use.

{% hint style="info" %}
If this wire comes out, you can try to coax it back into the sheath. If this is not possible, please [contact Freefly Support](https://freeflysystems.com/contact)
{% endhint %}

{% hint style="danger" %}
Do not fly or turn on HV with the internal tether wire exposed
{% endhint %}

#### Tether backup battery

Tether ground station has backup battery for keeping tension during a ground station power failure. please ensure the tether ground station is charged more than 50% before flight.

{% hint style="info" %}
The ground station uses power to reel in the cable, and it cannot be reeled in by hand
{% endhint %}

#### Light leaf 

User replaceable with (2) M3x6mm Socket Head Screws.

#### Astro Maintenance

[Click here for standard Astro maintenance information](https://freefly.gitbook.io/astro-public/maintenance/standard-maintenance-procedures)


---

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