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AP/FD VERTICAL MODES - DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-50 P 21/22
FCOM 19 AUG 10
Applicable to: ALL
TOO STEEP PATH
A descent segment is called “too steep path” when FM predicts that the descent segment between
two constraint waypoints is impossible to fly at the planned descent speed with half speedbrakes
extended.
When this occurs, the MCDU displays no predictions between the upper and the lower points of
the too steep path. Relevant message “TOO STEEP PATH” is displayed on MCDU.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-50 P 22/22
FCOM 19 AUG 10
When the aircraft reaches the beginning of the too steep path segment, the FM recomputes the
VDEV using an idle segment from the end of the too steep path segment.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-60 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The OPEN DES mode is a selected mode. It maintains a SPD/MACH (selected or managed) with the
AP/FD pitch mode while autothrust (if active) maintains IDLE thrust.
It is not to be used for final approach.
ENGAGEMENT CONDITIONS
Applicable to:
,
,
MSN,,,,
The OPEN DES mode can be engaged only if the following conditions are met:
The aircraft has ‐ been in flight for more than 5 s
‐ LAND mode is not engaged
‐ The FCU selected altitude is lower than present altitude.
The OPEN DES mode is engaged by one of the following:
‐ Pulling out the ALT knob
‐ Selecting a manual speed when EXP mode �� is engaged.
Note: When OP DES is engaged:
‐ The FMA displays “OP DES”
‐ The managed LVL/CH dot on the FCU goes out
‐ The system arms the ALT mode.
DISENGAGEMENT CONDITIONS
Applicable to:
The OPEN DES mode is disengaged by one of the following conditions:
‐ Manual engagement of another vertical mode
‐ Selection of an altitude higher than present altitude. V/S (FPA) engages on current V/S (FPA).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-60 P 2/2
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to:
,
,
MSN,,,,
The OPEN DES mode is disengaged by one of the following conditions:
‐ Manual engagement of another vertical mode
‐ Selection of an altitude higher than present altitude. V/S (FPA) engages on current V/S (FPA).
The vertical mode is boxed white. If within 5 s after the reversion to V/S, the flight crew does not
confirm the altitude target change by another expected action, a triple click aural warning sounds,
and the V/S (FPA) is boxed white and flashes for 10 s.
GUIDANCE
Applicable to: ALL
When OPEN DES is engaged, pitch control maintains the target speed/Mach number, and autothrust
maintains idle thrust (or the flight crew maintains it manually). The speed target may be either
selected or managed.
The OPEN DES mode disregards all altitude constraints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-65 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
ALT* mode guides the aircraft to acquire the FCU selected altitude.
ALT CST* guides the aircraft to acquire an altitude constraint provided by Flight Management. Once
the aircraft has reached the altitude, the altitude mode (ALT or ALT CST) engages.
ENGAGEMENT CONDITIONS
Applicable to: ALL
The mode engages when the aircraft reaches the altitude capture zone, defined by the aircraft
vertical speed (among other parameters).
Note: ALT* and ALT CST* cannot be engaged below 400 ft, if either the takeoff or the go-around
mode is engaged.
DISENGAGEMENT CONDITIONS
Applicable to:
The mode is disengaged by one of the following conditions:
Engagement of V/S mode on current vertical speed by turning ‐ the FCU ALT knob by more than
250 ft.
‐ Engagement of another vertical mode provided the FCU altitude has been changed by more than
250 ft.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-65 P 2/4
　
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