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displays it on the ND.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-10 P 17/40
FCOM 19 AUG 10
The FMGS predicts the estimated time and amount of fuel remaining at which the aircraft
must exit holding so as to comply with the fuel policy specified on the fuel prediction page.
When the aircraft enters the holding pattern, the FMGS revises all predictions and assumes
the aircraft will fly one turn of the holding pattern.
All predictions are revised if there is one additional holding pattern when the holding fix is
overflown.
On reaching the speed change pseudo waypoint
The FMGS either causes the aircraft to decelerate to the hold speed (if managed speed
is active and NAV mode engaged), or displays “SET HOLD SPD” (set hold speed) on the
MCDU and primary flight display if the flight crew has selected a speed target.
The default hold speed is the lowest of :
Maximum endurance speed‐
ICAO ‐limit holding speed
Speed constraint (if any).‐
When no specific speed limit applies, the default hold speed is approximately equal to Green
Dot speed.
The flight plan predictions for time and fuel do not yet consider that the hold will be flown.
However, the navigation display shows the hold entry and holding pattern trajectory.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-10 P 18/40
FCOM 19 AUG 10
Deceleration receives priority, so that when the aircraft is in descent with the descent mode
engaged, it will deviate above the descent path to decelerate. (VDEV becomes positive on
the progress page).
The flight plan page displays an immediate exit prompt.
If the flight crew presses the key next to “IMM EXIT” before arriving at the holding fix, the
aircraft will not enter the holding pattern, but will resume its phase-related managed-speed
profile.
After reaching the hold entry fix
The aircraft enters the hold. The MCDU HOLD page displays the associated holding data :
The inbound course (INB CRS)‐
The TURN direction (L or R)‐
The TIME/DIST‐
The LAST EXIT time and the associated fuel to reach the alternate airport with no extra‐
fuel.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-10 P 19/40
FCOM 19 AUG 10
The FMS assumes that the aircraft will fly one turn of the holding pattern, and revises the
predictions accordingly.
When the holding pattern is defined by a leg time (and not a leg distance), the system revises
the size of the hold as a function of the target speed :
If managed speed is active, the system uses the predicted holding speed to calculate the‐
size of the holding pattern.
If the selected speed is active, the system uses the target speed the flight crew selects at‐
the entry fix sequencing to calculate the size of the holding pattern.
The VDEV displayed on the primary flight display and the PROG page when the aircraft‐
is flying in the HM (hold pattern with manual termination) is the difference between the
aircraft's current altitude, and the altitude at which it should be, when it reaches the hold
exit fix in order to be positioned correctly on the descent path.
With IMM EXIT pressed (aircraft in the holding pattern)
The predictions and guidance assume that the aircraft is returning immediately to the hold fix.
Sequencing the hold fix, the aircraft exits the holding pattern and resumes its navigation.
The flight plan page displays “RESUME HOLD*” instead of “IMM EXIT*”.
HOLD EXIT PROCEDURE
Position (1) If “IMM EXIT” pressed, aircraft will exit at next fix overfly.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-10 P 20/40
FCOM 19 AUG 10
Position (2) If “IMM EXIT” pressed, aircraft will make an immediate turn to the fix where hold will
be exited.
　 If managed speed is active the computer sets the target speed to the applicable speed of
the current phase (for example, speed constraint, ECON speed, or speed limit).
The computer then bases its predictions on the assumption that the flight will continue on
the descent path, if the aircraft is in a descent.
　 If DES mode is engaged
the following applies :
The holding pattern is never included in the descent path computation.‐
　
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