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When using the RADIAL FIX INFO function, the pilot defines waypoint intersections of the flight
plan with radials associated to a fix.
When the crew inserts the intersection point, the system automatically identifies this point, but
does not store it in the navigation database.
RADIAL FIX INFO function offers 2 possible waypoint insertions : Radial intercept waypoint and
abeam intercept waypoint.
INSERTING A RADIAL INTERCEPT WAYPOINT
The crew accesses the radial intercept function from the LAT REV page at the origin, at the “from”
waypoint, or at the destination airport.
WRITE the reference fix identifier into the scratchpad. It may be any database or pilot-defined fix
(here POI).
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PRESS [ 1L ].
WRITE the radial in the scratchpad (here 120 °), and ENTER it [ 2L ].
If the radial line intersects the active flight plan, the system computes the time, the along path
Distance To Go (DTG), and the altitude at the intersection point.
Up to three radials can be entered.
INSERTING AN ABEAM INTERCEPT WAYPOINT
WRITE the reference fix identifier into the scratchpad (here POI), and ENTER it [1L].
SELECT the ABEAM prompt [ 5L ] : The system computes the radial, time, distance to go, altitude
and predictions related to the waypoint abeam the reference fix.
SELECT [5L] to insert the abeam intercept waypoint into the flight plan : The system automatically
assigns its identifier as AB, followed by the first five characters of the reference fix identifier
(Example ABPOI).
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General
GENERAL
Applicable to: ALL
The vertical flight plan is divided into the following flight phases:
Preflight - Takeoff - Climb - Cruise - Descent - Approach - Go-Around - Done.
All but “Preflight” and “Done” phases are associated with speed and altitude profiles.
Each phase has an assigned profile of target speeds. For each phase the FMGS computes an
optimum (ECON) speed as a function of the strategic parameters (CI, CRZ FL, ZFW, ZFWCG, block
FUEL) and performance criteria.
ECON speed is the basis of the managed speed profile.
The ECON speed can be modified by:
Presetting a speed or Mach number on the MCDU ‐ (PERF page) for the next phase
‐ Selecting on the FCU a speed or a Mach number for the active phase
‐ Inserting speed constraints or speed limits on the MCDU vertical revision (VERT REV) page.
The vertical flight plan includes vertical constraints (altitude, speed, time) that may be stored in the
data base or entered manually by the flight crew through vertical revision pages.
The flight crew may also define step climbs or step descents for cruise purposes. If the flight crew
plans to climb to a higher flight level or descend to a lower level, they can use a vertical revision at
any waypoint to insert the new level.
When all the vertical data has been defined, the FMGC computes the vertical profile and the
managed speed/Mach profile from takeoff to landing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
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VERTICAL FLIGHT PLANNING
Applicable to:
DATA ENTRY
The vertical flight plan provides the FMGS with all the data required to calculate performance and
predictions. This data is either entered by the flight crew or calculated by the FMS.
There are three categories of data:
‐ Strategic data, that applies to the overall flight profile:
• Cost Index (CI)
• Cruise Flight Level (CRZ FL)
• Zero-Fuel Weight (ZFW)
• Zero-Fuel Weight Center of Gravity (ZFWCG)
• Block Fuel.
‐ Weather data:
• Winds (for climb, cruise, descent, approach)
　
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