Systems Guide

A318/A319/A320/A321

Professional

SYSTEMS

Systems guide

Vol

04-03-17

11 July 2018

VERTICAL MODES

The vertical guidance modes will make the aircraft change altitude. To leave an FCU selected altitude a

dual action sequence is needed:

• Turn the ALT selector to set the new altitude

• Pull the ALT selector to select OPEN CLB/DES mode or

Push the ALT selector to engage CLB/DES mode or

Select a target V/S and pull the V/S selector knob to engage V/S mode

CLIMB

CLB mode manages the vertical guidance towards the FCU selected altitude taking altitude and speed

constraints into account.

ARMING CONDITIONS

• On ground or when TAKE OFF or GA mode are engaged as long as no other vertical modes are

selected.

• In flight when lateral NAV mode is engaged, FCU selected altitude is higher than aircraft altitude

or when aircraft meets a ALT CSTR

DISARMING CONDITIONS

• Engagement of any other vertical mode

• FCU selected mode lower then aircraft altitude

• Switching to DES or APP phase

• Loss of vertical flight path validity or loss of ANV mode

ENGAGEMENT CONDITIONS

• Aircraft more than 5 seconds in flight

• FCU selected altitude above current altitude

• Not in descent or approach mode

• NAV mode engaged

• Not in G/S mode