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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 16/44
FCOM 19 AUG 10
DATABASE HOLD
If the holding pattern is part of the database, it is named DATABASE HOLD and all its
associated data (inbound course, turn direction, time/distance) are defined in the data base.
Flight crew can modify this data.
COMPUTED HOLD AT ...
If the holding pattern is not in the database, the FMGC designs a holding pattern and proposes
it to the pilot. The associated data consists of default values that the pilot can modify.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 17/44
FCOM 19 AUG 10
HOLD AT ...
If the pilot inserts into the active flight plan a holding pattern that is manually corrected from a
hold defined by the FMGS, the screen displays a “HOLD AT ...” page. The field 2R displays
REVERT TO DATABASE or REVERT TO COMPUTED to restore the database data if
necessary.
PREDICTIONS AND GUIDANCE ASSOCIATED WITH AN HM HOLDING PATTERN (HOLD
WITH MANUAL TERMINATION)
Before deceleration
Although the hold is inserted into the flight plan, the FMGS does not take it into account for
predictions until the aircraft enters the hold.
However, if the hold is not deleted by the crew, the FMGS schedules a deceleration point and
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_20-30-10-15 P 18/44
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_20-30-10-15 P 19/44
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_20-30-10-15 P 20/44
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.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(77)
