# HYDRAULIC

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![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/hydraulic-panel-image-fyrqowkd.png)

### ENG PUMP SHUTOFF BUTTON <a href="#toc118376437" id="toc118376437"></a>

**PUSH IN:** Closes the hydraulic shutoff valve (SOV), isolating the respective engine driven pump (EDP) from the associated hydraulic system.

**PUSH OUT:** Normal position.

### ELECTRIC HYDRAULIC PUMP SELECTOR KNOB <a href="#toc118376438" id="toc118376438"></a>

**OFF:** Turns the respective pump off.

**AUTO:** Back-up for the respective EDP.

In flight: Activates in case of

* EDP or engine fail, or
* Flaps selected > 0.

On ground: Activates in case of flaps selected >0, and

* TL set to takeoff thrust, or
* Groundspeed > 50 kts.

**ON:** Pump operates continuously, overriding system logic.

Note: ELEC PUMP 2 in AUTO: If engine 1 running and parking brake released pump turns on (Single engine taxi logic).

![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/hydraulic-panel-image-xwwdth3g.png)

### PTU (POWER TRANSFER UNIT) KNOB <a href="#toc118376439" id="toc118376439"></a>

**OFF:** PTU is turned off.

**AUTO:** Allows the PTU to operate automatically, according to hydraulic system logic.

**ON:** Operates continuously, overriding system logic.

### HYDRAULIC SYSTEM 3 SELECTOR KNOBS <a href="#toc118376440" id="toc118376440"></a>

**OFF:** Turns the respective electrical pump off.

**ON:** Turns the respective electrical pump on. 3B overrides system logic.

**AUTO (3B):** Turns 3B on automatically if AC Electric Pump 3A fails.

{% hint style="info" %}
The PTU does not work on the ground.
{% endhint %}

<mark style="color:red;">Note: HYDRAULIC SYSTEM 3A pump is powered by the AC ESS BUS (Electrical Emergency).</mark>


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