Systems Guide

Aerosoft
Airbus A320/A321
SYSTEMS
Systems guide
Vol
4
04-03-20
28 October 2014
ENGAGEMENT CONDITIONS
 ALT or ALT CST is automatically engaged when the aircraft is 20 feet from the target altitude.
DISENGAGEMENT CONDITIONS
 ALT or ALT CST is disengaged when any other vertical mode is selected.
GUIDANCE
 The level kept is the level memorized at engagement of the mode.
VERTICAL SPEED – FLIGHT PATH ANGLE
V/S–FPA is a selected mode, it captures and keeps the vertical speed or the flight path displayed in the V/S – FPA
FCU window.
ENGAGEMENT CONDITIONS
V/S-FPA is automatically selected:
 5 seconds after liftoff with no other vertical mode selected
 Loss of G/S, G/S*, FINAL, LOC. LOC*, NAV (with DES engaged)
 Automatic reversions
V/S-FPA is manually selected by:
 V/S-FPA selection knob pulled
 V/S-FPA selection knob pushed (will engage an immediate level off and set VS=0)
 AP engagement with no other vertical mode set
 Selection of an different altitude (at least 250 ft from current altitude) in ALT*
 Selection of an higher altitude in DES or OP DES
 Selection of an lower altitude in CLB or OP CLB
DISENGAGEMENT CONDITIONS
 Engagement of other vertical mode
o Manually by pulling altitude selection knob or performing a go around
o Automatically by reaching FCU altitude or G/S* engagement
GUIDANCE
FMGS pitch mode will guide the aircraft to the target V/S (FPA). A/THR mode is SPD or MACH.
V/S-FPA guidance has priority over speed guidance and when reaching the limit of the flight envelope will change
to OPEN mode.