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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 160 °. 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 BEROK - RADIAL 116 ° INBOUND
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Example : RADIAL OUTBND
DIR TO BEROK - RADIAL 228 ° OUTBOUND
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OVFY (OVERFLY) KEY
Applicable to:
,
,
MSN,,
4538,,
The overfly key programs the Flight Management Guidance Computer to fly over a specific waypoint
or navaid. Using the overfly function results in the creation of a temporary F-PLN. The function has
no effect on the active F-PLN, until the temporary is inserted in the active F-PLN.
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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.
INSERT the temporary into the active F-PLN.
To cancel the overfly function, associated to a waypoint, press the OFFY ▵ “key again on the MCDU.
The overfly function allows you to fly over a specific waypoint, and return the aircraft to the great
circle track.
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FCOM 19 AUG 10
"UPDATE AT"
Applicable to:
,
,
MSN,,
4538,,
To manually change the position computed by the FMGC (FM position and bias), the pilot uses
“UPDATE AT” on the progress page.
Use this function 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 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
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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.
　
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