To set STD baro, which action is performed?

To set STD baro, which action is performed?

• A. Turn the BARO knob
• B. Press the BARO set knob
• C. Set STD on the MCDU
• D. Push STD in the altimeter window

Answer: (B)

Setting STD baro means switching the altimeter reference to standard pressure (1013.25 hPa) so altitude is read against a fixed pressure, not the local QNH. On the A320, you do this by pressing the BARO SET pushbutton integrated with the BARO knob. Pressing this toggle activates STD, whereas simply turning the knob changes the QNH value. Using the MCDU or pushing an STD button in the altimeter window isn’t how STD is selected on the A320. So the best action to set STD is to press the BARO set knob.

Setting STD baro means switching the altimeter reference to standard pressure (1013.25 hPa) so altitude is read against a fixed pressure, not the local QNH. On the A320, you do this by pressing the BARO SET pushbutton integrated with the BARO knob. Pressing this toggle activates STD, whereas simply turning the knob changes the QNH value. Using the MCDU or pushing an STD button in the altimeter window isn’t how STD is selected on the A320. So the best action to set STD is to press the BARO set knob.