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F-PLN in the MCDU.
Downloaded information include :
‐ waypoint position
‐ waypoint identifier
‐ leg type
‐ discontinuity
‐ overfly
‐ turn direction
Heading legs, course to fix legs, ..., computed INTCPT positions, pseudo waypoints, ..., cannot be
downloaded.
They are replaced by discontinuities.
Maximum of 150 waypoints are downloaded.
EXAMPLE OF DOWNLOADED F-PLN
In that procedure, all the legs are coded as CF (Course to Fix) legs. This explains all the
discontinuities resulting in the B/UP F-PLN.
These discontinuities may be cleared.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - MCDU BACK UP NAVIGATION
A330/A340 FLEET DSC-22_20-60-150 P 3/8
FCOM 19 AUG 10
When the second FM fails
REENGAGE and SELECT the required AP and A/THR modes (if disconnected).
SELECT the FM SOURCE SELECTOR to NORM
MCDU MENU page is automatically displayed.
NAV B/UP prompt appears.
SELECT the NAV B/UP prompt on both MCDU.
SELECT NAV on both RMP
Tune the required navaids
‐ Only MCDU MENU
F-PLN key
PROG key
DIR key
‐ B/UP F-PLN page
B/UP PROG page
B/UP IRS 1, 2, 3 pages are available when BACK UP NAV is selected.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - MCDU BACK UP NAVIGATION
A330/A340 FLEET DSC-22_20-60-150 P 4/8
FCOM 19 AUG 10
AP AND A/THR
One FG at least must be available to allow the engagement of AP/FD and A/THR.
All FM managed modes are lost as well as managed speed. As a consequence :
‐ LAT F-PLN is flown in HDG/TRK modes
‐ VERT F-PLN is flown in OPEN/V/S/FPA modes
‐ SPD TARGET is manually SELECTED on the FCU
‐ SPD/MACH crossover is manually SELECTED on the FCU
It is recommended to use the TRK/FPA modes :
‐ SELECT the required TRK on FCU at waypoint sequencing (as no AP/FD coupling exists in
NAV B/UP). F-PLN sequencing is automatic.
‐ MONITOR the track of the next leg prior reaching the TO waypoint (track between TO and next
waypoints is true track).
‐ ADJUST the track to follow the F-PLN with X-TRK = 0
‐ USE OP DES or FPA to descend as suitable.
FPA allows easy altitudes predictions :
DNM=▹(FL)/FPA°
NAVIGATION MONITORING
The navigation accuracy check must be achieved periodically using the same principle as with FM
navigation :
COMPARE computed data with raw data
SELECT ON RMP the applicable navaid
PRESS the [PROG] key
B/UP PROG page is displayed
WRITE in the scratchpad then ENTER the navaid LAT/LONG
SELECT associated navaid needle on the EFIS control panel.
COMPARE computed BRG/DIST with RAW DATA on ND
• If the crosscheck is POSITIVE the ND may be used in ROSE NAV/MAP modes with raw data
• If the crosscheck is NEGATIVE the ND must be used in ROSE VOR/ROSE ILS modes.
Note: B/UP IRS pages may also be used to check the position.
FLIGHT PLANNING
The following revisions may be achieved :
‐ WPT insertion/deletion
‐ OVERFLY insertion/deletion
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - MCDU BACK UP NAVIGATION
A330/A340 FLEET DSC-22_20-60-150 P 5/8
FCOM 19 AUG 10
‐ DIR TO a waypoint
‐ CLR waypoints/discontinuities
Waypoint identifiers are either published waypoint identifiers if present in the MCDU active F-PLN,
or coded LAT/LONG identifiers resulting from pilot entries.
All flight planning functions are directly applied on active F-PLN without LAT REV page.
WAYPOINT INSERTION
Waypoint insertion into the F-PLN is performed via the B/UP F-PLN page by selecting the line
key adjacent to the desired point of insertion, whenever a pre-existing waypoint identifier or valid
IDENT/LAT/LONG or LAT/LONG entry is displayed in the scrathpad.
Any waypoint entry which causes the number of legs in the route to exceed the maximum allowed
results in the “F-PLN FULL” message.
Note: • If the inserted waypoint is entered only with LAT/LONG, its identifier would be :
N48E001
• If the pilot writes a waypoint IDENT/LAT/LONG with an ident already used in the
F-PLN, a message “NOT ALLOWED” is displayed.
WAYPOINT DELETION
Waypoint and discontinuity may be deleted from the B/UP F-PLN page by using the CLR key.
OVERFLY INSERTION/DELETION
Same as for the FM F-PLN.
DIRECT TO A WAYPOINT
The DIR TO function operates as for the normal F-PLN, except that RADIAL INTERCEPT and
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(24)
