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‐ When the pilot encounters a flight plan discontinuity, or if a major reset occurs, the flight plan
page displays “PPOS - F-PLAN DISCONTINUITY”, and the pilot looses managed guidance in
both the lateral and vertical plans.
The autopilot or flight director reverts to the basic HDG V/S (or TRK FPA) modes. Predictions
remain available and are based on the assumption that the aircraft will fly a direct leg from its
present position to the next waypoint.
‐ In both of these cases, the only way to get back to a standard flight plan is to perform a
“DIR TO” to a designated waypoint.
‐ Following a DIR TO, the message “MAP PARTLY DISPLAYED” may appear on the NDs, if
the new flight plan includes a very long leg. (Refer to DSC-31-45 FLAGS AND MESSAGES
DISPLAYED ON ND for description). When this message comes up, enter an intermediate
waypoint to shorten the leg.
Note: During cruise, the DIR TO function is not available as long as uplink wind data, received
through ACARS �� , is not inserted or cancelled on the CRUISE WIND page.
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 34/42
FCOM 19 AUG 10
PROCEDURE FOR DIR TO/ABEAM
Example : DIR TO/ABEAM BEROK
PRESS the DIR key on the MCDU.
WRITE the waypoint identifier into the scratchpad (Example : BEROK).
PRESS [1 L] to enter the waypoint in the DIR TO field.
SELECT the ABEAM PTS function.
The display reverts to F-PLN A page.
Note: 1. If, between two waypoints projected on the direct leg, there was a discontinuity in the
original flight plan, this discontinuity disappears between the corresponding abeam
points on the direct leg.
2. If the pilot enters a latitude/longitude type reference waypoint, the system renames the
abeam point with its recomputed coordinates (only in degrees).
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 35/42
FCOM 19 AUG 10
PROCEDURE FOR DIR TO/INTERCEPT
PRESS the DIR key.
WRITE the waypoint identifier into the scratchpad.
PRESS [1L] to enter the waypoint in the DIR TO field.
In the [1R] and [2R] fields, the MCDU displays the functions radial inbound and radial outbound
from the waypoint.
If the waypoint belongs to the flight plan, the system displays the flight plan track as the default
inbound radial. The crew can modify it.
WRITE the required in or out radial into the scratchpad.
PRESS [1R] or [2R] to enter the radial in the required field.
The ND displays the entered radial as an amber dotted line : The pilot can still modify it.
PRESS [1R] or [2R] to confirm the DIR TO/INTERCEPT selection.
The display reverts to the F-PLN A page, the system arms the NAV mode, and engages the
HDG mode. The FROM waypoint is the aircraft position at the time of the DIR TO/INTERCEPT
selection. The MCDU indicates it as INBND or OUTBND.
Note: 1. If the waypoint does not belong to the flight plan, the system strings the DIR
TO/INTERCEPT leg to this waypoint, and inserts a discontinuity following the
waypoint.
2. A DIR TO/INTERCEPT cancels any active offset.
3. If the current AP/FD lateral mode is HDG or TRK, NAV becomes armed.
If the NAV mode was engaged, NAV becomes armed. FCU HDG or TRK must be
used to guide the aircraft.
The ND displays an intercept point, if the intercept angle is less than 120 °. The
system constantly updates it to reflect the current aircraft track and position with
respect to the intercept radial. The NAV mode engages when reaching the intercept
point.
EXAMPLE : RADIAL INBND
DIR TO AMB - RADIAL 200 ° INBOUND
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 36/42
FCOM 19 AUG 10
EXAMPLE : RADIAL OUTBND
DIR TO AMB - RADIAL 200 ° OUTBOUND
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 37/42
FCOM 19 AUG 10
ENABLE ALTN
Applicable to:
This enables the pilot to initiate a diversion by entering the alternate flight plan just after the revision
waypoint (with a discontinuity).
The pilot may have to adjust the resulting flight plan (use “direct to”, or add or suppress waypoints),
　
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