# Testing the operation of the hydraulic system

## Preliminary requirements

### Safety conditions

{% hint style="warning" %}
Only a qualified person can operate the engine.
{% endhint %}

{% hint style="warning" %}
You must not do this procedure in the hangar.
{% endhint %}

{% hint style="warning" %}
Do not operate the controls more than permitted for ground idle.
{% endhint %}

## Procedure

1. Start the helicopter (BHT-505-FM, Section 2).
2. Adjust the friction knobs of the collective and cyclic controls for minimum friction.
3. Set the HYD SYS switch to the HYD SYS position.
4. Make sure that the collective and cyclic controls move freely.
5. Set the HYD SYS switch to the OFF position.
6. Make sure that more force is necessary to move the collective and cyclic controls.
7. Adjust the friction knobs of the collective and cyclic controls, as necessary.

## Requirements after job completion

### Required Conditions

<table><thead><tr><th>Action/Condition</th><th data-type="content-ref">Reference</th></tr></thead><tbody><tr><td>Stop the helicopter.</td><td></td></tr><tr><td>Do a check of the hydraulic reservoir level.</td><td><a href="checking-the-fluid-level-of-the-hydraulic-system">checking-the-fluid-level-of-the-hydraulic-system</a></td></tr></tbody></table>
