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DES MODE ENGAGED
When DES mode is engaged, NAV mode is engaged, and the system takes into account all
altitude and speed constraints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-60 P 10/22
FCOM 19 AUG 10
The key parameter for monitoring the descent is the vertical deviation (VDEV) displayed on the
PFD and on the PROG page, which indicates whether the aircraft is on, above, or below the
descent profile.
PROCEDURE
SET the ATC-cleared altitude on the FCU (considering which altitude is safe).
If the lowest safe altitude is higher than the ATC-cleared altitude, check with ATC to verify if this
constraint applies.
If it is confirmed, SET the FCU altitude to the safe altitude, until it is safe to go to the
ATC-cleared altitude.
MONITOR vertical deviation (VDEV) on both the PFD and the PROG page.
MONITOR the speed change that occurs, when the aircraft reaches a speed change symbol
(magenta ball) under managed speed.
MONITOR the FMA (ALT*, ALT CST*, ALT, ALT CST) when the aircraft reaches level symbols).
�� If the aircraft is on the descent profile :
The aircraft is considered to be on the vertical profile when it is within 50 ft of it. VDEV is
close to zero, and the system predicts that it will match constraints until the aircraft levels off
at the next FCU altitude.
MONITOR the predicted descent point after the next level-off.
A/THR adjusts thrust for the particular segment. The first FMA column may display “THR
IDLE” or “SPEED”.
�� If the aircraft is above the descent profile :
VDEV is down on the PFD and positive on the PROG page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-60 P 11/22
FCOM 19 AUG 10
A/THR sets IDLE thrust and the AP increases speed by calling for down elevator. If the
aircraft reaches the upper limit of the managed speed range, the aircraft diverges and
maintains the upper limit speed.
Procedure
SELECT a descent speed higher than the upper limit, when possible.
MONITOR the intercept symbol .
When this symbol reaches the next ALT CSTR waypoint “MORE DRAG” appears on the
PFD indicating that speedbrakes must be extended in order to match the next altitude
constraint. This is an advisory message.
Note: When DES mode is engaged, speedbrake extension will not necessarily increase
the descent rate. It only does so if the aircraft is above the profile.
If the aircraft is on, or below, the profile : the system will add thrust to maintain the
aircraft on profile and within the speed target range.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-60 P 12/22
FCOM 19 AUG 10
�� If an altitude constraint is predicted to be missed by more than 250 ft the vertical
revision page shows ALT ERROR at the waypoint.
�� If a speed constraint is predicted to be missed by more than 10 kt :
SELECT an appropriate speed.
RESUME managed speed when the aircraft is back on the descent profile.
�� If the aircraft is below the descent profile :
VDEV is up on the PFD and negative on the PROG page. The system maintains the target
speed (managed or selected speed).
MONITOR the intercept symbol ([ ]) on the ND and any leveling off at the next ALT CSTR.
�� If the aircraft is flying above the max descent speed limit altitude, or 5 000 ft above
the destination elevation :
The FMGS maintains the V/S at -1 000 ft/min and the target speed, until the aircraft reaches
the altitude constraint or intercepts the descent profile.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-60 P 13/22
FCOM 19 AUG 10
�� If the aircraft is flying below the max descent speed limit altitude, or 5 000 ft above
the destination elevation :
The FMGS maintains the V/S at - 500 ft/min and the target speed, until the aircraft
intercepts either the altitude constraint or the descent profile.
�� If the rate of descent has to be increased (ATC requirement) :
SELECT OP DES mode
Increase the target speed or extend the speedbrakes.
Applicable to:
OP DES, V/S OR FPA MODE ENGAGED
In either case, the aircraft is no longer ‐ guided on the descent profile and altitude constraints
are disregarded. If NAV mode is engaged the ND displays a white circle on waypoint with an
　
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