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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.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-10 P 40/40
FCOM 19 AUG 10
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 cover‐age :
• 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 majo‐r 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.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 1/44
FCOM 19 AUG 10
FMS2 HONEYWELL
GENERAL
Applicable to: ,
The lateral revision function allows the pilot to create or modify the following parts of the flight plan :
airway‐
waypoint‐
new destination‐
holding pattern‐
offset‐
alternate‐
Fix information‐
Each time the pilot activates one of the revisions listed above, he accesses to a temporary flight
plan that allows to check the modification before inserting it in the active flight plan. The crew
selects these functions by pressing the left keys on F-PLN A or B.
Direct to and overfly functions are accessed through MCDU keys. No temporary flight plan is‐
created with these functions.
“Update at” capability is ‐a specific function that manually updates the FM position. It does not use
a temporary flight plan, but the pilot must confirm the insertion before it is activated.
TEMPORARY F-PLN (TMPY)
Applicable to: ,
When a pilot makes a lateral revision to the F-PLN, the FMGS creates a temporary flight plan. This is
a copy of the active F-PLN, but is corrected by the lateral revision in progress.
The aircraft continues to follow the active F-PLN until the temporary revision is inserted.
The revision appears in yellow characters on both MCDUs and NDs.
Lateral and vertical revisions cannot be made to a temporary F‐-PLN.
Only one temporary F‐-PLN may be accessed at a time.
The “DIRECT TO” function, when used, erases a temporary F‐-PLN.
When a DIR TO is in process, a‐ temporary revision cannot be displayed on the other MCDU.
A TMPY F‐-PLN changes the title of the flight plan pages. (TMPY appears in all titles).
　
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