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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_20-30-10-10 P 31/32
FCOM 19 AUG 10
CAUTION
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 is not 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.
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.
"UPDATE AT"
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_20-30-10-10 P 32/32
FCOM 19 AUG 10
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 1/44
FCOM 19 AUG 10
FMS2 THALES
GENERAL
Applicable to:
,
,
MSN,,
4538,,
The lateral revision function enables 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 above-listed revisions, he accesses a temporary flight plan
that enables the modification to be checked 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 via the 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 its insertion before it is activated.
TEMPORARY F-PLN (TMPY)
Applicable to:
,
,
MSN,,
4538,,
A temporary F-PLN is created whenever a revision is performed on either of the following pages :
‐ The F-PLN A or B pages, or
‐ The DIR TO page, or
‐ The LAT REV page, or
‐ The VERT REV page.
It is also created upon an Engine-Out detection.
The temporary F-PLN enables the performance of multiple revisions, and use of the UNDO function.
This is a copy of the active F-PLN, but is corrected by the lateral or vertical revisions in progress.
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 2/44
FCOM 19 AUG 10
The UNDO function is available when there is more than one pending revision in the temporary
F-PLN. It can only be used once by the crew to cancel the last revision in the temporary F-PLN.
The temporary F-PLN created subsequently to a DIR TO function can only be modified once.
The aircraft continues to follow the active F-PLN, until the temporary revision is inserted.
The temporary F-PLN is continually sequenced as the active F-PLN, until it diverges from the active
F-PLN.
The revision data appears in yellow on both MCDUs and NDs.
Lateral and vertical revisions ‐ can be made on a temporary F-PLN.
‐ Only one temporary F-PLN may be accessed at a time.
‐ A revision is rejected whenever a DIR TO revision is already is process. (The “DIR TO IN
　
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