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310.
‐ Cost index 0.
‐ Constant wind (as entered in the alternate field of the DES WIND page).
‐ Constant delta ISA (equal to delta ISA at primary destination).
‐ The distance along the flight plan, from the destination to the alternate airport (including the
missed approach procedure, if any).
ENABLE ALTN
Applicable to:
,
,
MSN,,
4538,,
This enables the flight crew to initiate a diversion by entering the alternate flight plan just after the
revision waypoint (with a discontinuity). Using the ENABLE ALTN function results in the creation of
a temporary F-PLN. This function has no effect on the active F-PLN until the temporary F-PLN is
inserted.
The flight crew may have to adjust the resulting flight plan (add or delete waypoints), depending on
the circumstances.
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_20-30-10-18 P 26/44
FCOM 19 AUG 10
TO ACTIVATE THE PRIMARY ALTN :
SELECT a LAT REV at the “TO” waypoint (or at another suitable waypoint).
PRESS the ENABLE ALTN key.
ACCESS the temporary flight plan.
CLEAR the discontinuity and revise the temporary F-PLN as necessary.
INSERT the temporary F-PLN.
ADJUST the cost index on the PERF page and the defaulted cruise flight level (CRZ FL) on the
PROG page, as required.
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_20-30-10-18 P 27/44
FCOM 19 AUG 10
When ENABLE ALT is pressed at ABE, a flight plan discontinuity is created from ABE down to
destination and the alternate route is linked to the active flight plan.
DIR KEY (DIRECT-TO-FUNCTION)
Applicable to:
,
,
MSN,,
4538,,
GENERAL
The pilot uses the “Direct To” function to define a direct leg from the present position to any
waypoint on the active flight plan or to any waypoint.
The designated waypoint may be entered by its identifier (if it is stored in the navigation
database), or as a pilot defined element, or by a latitude/longitude, place/bearing/distance, a
place-bearing/place-bearing, or a place distance (PD) along the F-PLN.
Note: If the autopilot or flight director is in the heading/track or localizer mode, the “DIR TO”
function engages the NAV mode.
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_20-30-10-18 P 28/44
FCOM 19 AUG 10
Three functions are available through the DIR TO key :
DIR TO defines a direct leg from the present ‐ position to a specified waypoint.
NAV mode simultaneously engages upon DIR TO selection.
When the pilot uses DIR TO, the present position (PPOS) becomes the “FROM” waypoint and
the active flight plan shows it as the T-P (turn point).
‐ The DIR TO/ABEAM function, defines the abeam waypoints along the direct leg. These
waypoints are the projection on the direct leg of the initial F-PLN waypoints, located between
the aircraft position and the specified waypoint.
NAV mode simultaneously engages upon DIR TO/ABEAM selection.
‐ The DIR TO/INTCPT function allows the definition of a specified RADIAL INBOUND or
OUTBOUND at an inserted waypoint. The current aircraft track is used to compute the INTCPT
point with the specified radial.
NAV mode is simultaneously armed upon DIR TO/INTCPT selection.
If the DIR TO waypoint is part of the F-PLN, the FMS computes and proposes a default “Radial in”,
except if the DIR TO waypoint is preceeded by a F-PLN discontinuity.
The ND displays the DIR TO leg as a temporary flight plan leg, between the current aircraft
position and a specified waypoint. In case of a DIR TO/INTCPT, the leg is not displayed when the
angle between the current aircraft track and the intercept radial exceeds 160 °.
Note: As soon as a designated waypoint is entered or selected, the DIRECT TO or
DIRECT-TO-WITH ABEAM POINTS function is selected by default, and displayed (in
yellow), depending on the Airline option on the AMI file.
The following examples assume that the activated AMI default option is the “DIRECT TO”
function.
PROCEDURE FOR DIR TO WAYPOINT
CASE 1. THE “TO” WAYPOINT IS IN THE FLIGHT PLAN
Example : DIR TO FRZ (with the AMI default DIRECT TO option activated)
PRESS the DIR key on the MCDU.
PRESS the line select key next to “FRZ”.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(99)
