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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
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FCOM 19 AUG 10
EXAMPLE : RADIAL OUTBND
DIR TO AMB - RADIAL 200 ° OUTBOUND
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FLIGHT PLANNING - LATERAL FUNCTIONS
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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 :
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FCOM 19 AUG 10
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 returns the aircraft to the great
circle track.
UPDATE AT
Applicable to: ,
To manually change the position computed by the FMGS (FM position and bias =, the pilot uses
“UPDATED AT” on the progress page.
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OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
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FCOM 19 AUG 10
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 identifier for the navaid (or waypoint, or airport), or the coordinates, or the PBD or PB/PB
at which an update is intended.
PRESS [5L] 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 [5R] 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.
If the “UPDATE AT” does not take effect properly, 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 use “UPDATE AT” only 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 A/C POSITION” message appears and the position monitor page indicates an
obvious position mismatch.
• A “CHECK IRS/FM POSITION” message appears on the MCDU.
• A “FM/IR POSITION DISAGREE” message appears on the ECAM.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
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FCOM 19 AUG 10
When the 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
“update at” that is innacurate will have a temporary effect on the FM position.
　
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