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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_20-30-10-15 P 38/42
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.
INSERT the temporary flight plan.
ENTER an appropriate waypoint in DIRECT TO and adjust the flight plan.
ADJUST the cost index on the PERF page and the defaulted cruise flight level (CRZ FL) on the
PROG page, as required.
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.
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 39/42
FCOM 19 AUG 10
OVFY (OVERFLY) KEY
Applicable to:
The overfly key programs the Flight Management Guidance Computer to fly over a specific waypoint
or navaid. To use it :
PRESS the “OVFY” key.
A “▵” appears in the scratchpad.
INSERT it by pressing the key adjacent to the waypoint to be overflown. [3L] in this example.
The pilot cannot cancel the overfly program. If you do not want to fly over the point you have entered,
use DIR TO (direct to) the next waypoint or engage the heading mode, whichever is more suitable.
The overfly function allows you to fly over a specific waypoint, and return the aircraft to the great
circle track.
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 40/42
FCOM 19 AUG 10
"UPDATE AT"
Applicable to:
To manually change the position computed by the FMGC (FM position and bias), the pilot uses
“UPDATE AT” on the progress page.
Use this facility with extreme caution : It is apt to be inaccurate, because it relies on the pilot's
estimation of when a designated position has been reached.
WRITE the ident for the navaid (or waypoint or airport), or the coordinates, or the PBD or PB/PB at
which the update is intended.
PRESS [3L] to enter the ident in the “UPDATE AT” field. The coordinates of the point, along with its
identifier (or “ENTRY”, if the identifier is not in the database), appear in that field.
PRESS [3R] to activate the update, when you estimate that you are at the position.
Note: The system reinitializes the Estimated Position Error computation when a position update
is performed. This may lead to the appearance of a “NAV ACCUR DOWNGRAD” or “NAV
ACCUR UPGRAD” message.
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 41/42
FCOM 19 AUG 10
If the “UPDATE AT” does not properly take effect, it corrupts the FM position.
In an ‐ area with good radio navaid coverage :
• If the update error is small, subsequent radio position updating will correct the FM position.
• If the update error is large, the system will reject any radio updating because its internal
“reasonableness test” will reject the various navaids. Thus, the FM position will only be the MIX
IRS position corrected by the position bias, determined at the time of the update, and the error
will be maintained.
‐ In an area without proper navaid coverage, radio position updating will not be available and the FM
position, if incorrect, will remain incorrect until a new manual update is performed.
‐ Therefore, the pilot should only use “UPDATE AT” in case of a major position problem, such as :
• On the ground, no flight plan appears on the navigation display and ARC/ROSE NAV mode is
selected.
• A “CHECK IRS/FM POSITION” message appears on the MCDU.
• A “FM/IR POSITION DISAGREE” message appears on the ECAM.
When GPS PRIMARY is operative, the FM position will always converge towards the GPS position at
a rate depending on the aircraft altitude. Therefore, when GPS PRIMARY is operative, an inaccurate
“update at” will have a temporary effect on the FM position.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
　
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