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Basic managed SPD/MACH profile in DES mode is:
‐ ECON Mach, or SELECTED Mach
‐ ECON speed, or SELECTED speed
‐ SPD CSTR (if any)
‐ SPD LIMIT
‐ Green Dot/S/F/VAPP
‐ VAPP TARGET.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 6/14
FCOM 19 AUG 10
GUIDANCE IN DES MODE
Applicable to: ALL
DESCENT INITIATION
The aircraft will not start its descent automatically when reaching the top of descent (T/D). In order
to initiate the descent, the flight crew will set the clearance altitude by turning the ALT knob, then
pushes the ALT knob.
The aircraft will descend immediately:
‐ If the top of descent is not reached, the aircraft descends at a constant V/S converging on the
descent path
‐ If the aircraft is at or beyond the T/D, it descends at idle thrust.
DURING THE DESCENT
The flight crew will see a vertical deviation symbol (VDEV) along the ALT scale on the PFD and
a VDEV value on the PROG MCDU page, so that the aircraft’s vertical position can be monitored
versus the calculated descent profile.
The aircraft may deviate from the DES profile while DES mode is engaged if:
‐ Unexpected wind conditions are encountered
‐ Anti-icing is turned on
‐ The lateral flight plan is changed.
When the speed is managed, a target speed range displayed on the PFD defines acceptable
speed variations around the nominal descent speed target (limited to ± 20 kt).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 7/14
FCOM 19 AUG 10
FMA DISPLAY
When DES mode is engaged, the system arms ALT and displays the applicable target altitude on
the PFD altitude scale.
‐ If the next predicted level off is an altitude constraint, ALT is magenta on the FMA second line
and the PFD displays the altitude constraint magenta below the altitude scale.
When ALT CST (green) is engaged (aircraft flying at ALT CSTR), the system arms DES blue.
When the aircraft meets the constraint, DES again engages automatically.
‐ If the next predicted level off is the FCU altitude, ALT is blue on the FMA and the PFD displays
the FCU selected altitude in blue.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 8/14
FCOM 19 AUG 10
DES MODE PROFILE
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 9/14
FCOM 19 AUG 10
GENERAL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 10/14
FCOM 19 AUG 10
INTERCEPT POINT
Associated with the VDEV displayed on PFD, the ND shows an intercept point ( ) on the flight
plan. It indicates the position where the system predicts that the aircraft will intercept the descent
profile.
AIRCRAFT ABOVE THE DESCENT PROFILE
If the aircraft is above the descent profile, the speed will increase toward the upper limit of the
managed speed range. If the speed reaches the upper limit, the aircraft will maintain the speed but
will deviate from the profile (autothrust at idle).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 11/14
FCOM 19 AUG 10
The navigation display presents a pseudo waypoint (intercept point) along the flight plan that
assumes the aircraft will return to the profile using:
‐ Idle thrust
‐ 1/2 speedbrake extension
‐ ECON speed plus a margin (until intercepting the profile).
If necessary, the message “EXTEND SPD BRK” comes up on the PFD and the MCDU, and
remains there as long as more drag (speedbrakes) is still required. The flight crew should respond
to this message by deploying half speedbrakes.
Whenever the intercept point is predicted to be close to a constrained waypoint, the PFD and
MCDU display an “EXTEND SPD BRK” message.
Note: With DES mode engaged, the speedbrakes extension will not necessarily increase the
descent rate. It increases only if the aircraft is above path.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
　
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