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If a speed constraint is predicted to be missed :
SELECT an appropriate speed.
RESUME managed speed when the aircraft is back on the descent path.
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.
The autothrust is in speed mode with a -1 000 ft/min rate of descent (if the aircraft is flying
and idle segment), or - 500 ft/min (if the aircraft is flying a geometric segment), until the
profile is regained.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 4/12
FCOM 19 AUG 10
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: ,
DES MODE ENGAGED
When DES mode is engaged, NAV mode is engaged, and the system takes into account all
altitude and speed constraints.
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 also what is the safe altitude).
If the lowest safe altitude is higher than the ATC-cleared altitude, check with ATC that 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 the vertical deviation (VDEV) on 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 5/12
FCOM 19 AUG 10
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.
The autothrust adjusts the 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.
The autothrust 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 6/12
FCOM 19 AUG 10
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 “EXTEND SPD BRK” 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, the speedbrake extension will not necessarily
increase the descent rate. It does so only if the aircraft is above the profile. If the
aircraft is on or below the profile : the system will add thrust to keep the aircraft on
profile and within the speed target range.
If a speed constraint is predicted to be missed :
SELECT an appropriate speed.
RESUME managed speed when the aircraft is back on the descent path.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 7/12
FCOM 19 AUG 10
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 –1000 ft/min and the target speed, until the aircraft
reaches the altitude constraint or intercepts the descent profile.
If the aircraft is flying below the max descent speed limit altitude, or 5 000 ft
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 10(3)
