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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 2R field displays
REVERT TO DATABASE or REVERT TO COMPUTED to restore the database data, if
necessary.
PREDICTIONS AND GUIDANCE ASSOCIATED WITH A 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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 17/42
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 for one more holding circuit at holding fix overfly.
Upon 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 had selected a speed target.
The default hold speed is the lowest of the :
‐ 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 on the A318, ‐ A319, A320 (CFM) and A321
‐ Green Dot +20 kt on the A320 (IAE).
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 18/42
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 19/42
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 selected by the flight crew
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 correctly positioned on the descent path.
With IMM EXIT pressed (aircraft in the holding pattern)
The predictions and guidance assume that the aircraft is immediately returning 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*”.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
　
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