US Airways Airbus A319, A320, A321 Notes
77
Imaginary Centerline
You may have had an imaginary friend in your childhood. I didn’t. We won’t talk
about yours. However, the Airbus does have “imaginary” extended centerlines
that you can use. If you have been vectored off course and are cleared to join a
radial but don’t have the nav segment available you may be able to join it with no
reprogramming at all.
In this example you are on an arrival and vectored off course. Then you are
cleared to rejoin the radial for the arrival. However, the current nav segment has
already been cleared. As long as the next segment is the same radial the FMGC
will still join the “imaginary” extended centerline of the next nav segment.
This will also work in the case of being vectored for final approach. If you are
vectored to join outside the defined nav segment the FMGC will still join the
extended centerline.
Just press NAV engage and as long as the present heading will cross the
extended centerline it will join at the point of crossing. The display will not show a
nav line but it will show miles left or right of course until on the actual nav
segment. With the FMS 2 the course will actually show so you don’t have to
“imagine it”.
Auto Clear
I don’t have any technical info on this one so I just call it auto clear. On vectors if
you go close enough past a waypoint there is some FMGC logic that says you
won’t use that waypoint and it will automatically clear it. This happens most often
on close vectors for approach near the approach course on downwind.
FMS 2 Differences
US Airways East is now installing new FMS systems on the Airbus 319/320/321
aircraft. For the most part the new system is very similar to the old one. Some of
the benefits of the new system are faster processors, LCD screens in the MCDU
that allow lighter weight, less heat and brighter screens and of course new and
improved functions.
MCDU Keyboard Changes: The / (slash) and – and + signs are swapped. Also
the – and + keys are combined so if you need plus or minus you may have to
press more than once to get the appropriate sign. A space (SP) key is added
where the + key used to be so you can now use the SP key instead of the OVFY
Δ as a “spacebar” key. Arrow keys will now be used to page instead of the NEXT
PAGE key. Left and right arrow keys ( ← , →) are now available along with the
current up and down arrow keys. Bright (BRT) and DIM keys are now added to
increase or decrease the screen intensity instead of a knob to turn.
US Airways Airbus A319, A320, A321 Notes
78
Data Page – New CLOSEST AIRPORT function, shows nearest four
airports with bearing and distance to the airport. An
additional airport may also be entered by the pilot.
New EQUITIME POINT function, shows point in flight plan it
will take equal time to return to origination or continue to
destination. This point is displayed on the ND as a circle on
the routed with ETP next to it.
New A/C STATUS functionality, To change the performance
factor a CHG CODE of PRF must be used. After code is
accepted /PERF changes may be made
INIT Page - IRS INIT is on two pages now. From INIT page press IRS
INIT prompt. The LAT and LONG may now be scrolled and
the ALIGN IRS prompt will be shown on this second page.
F-PLN - Any change to the F-PLN page will now bring up TMPY
ERASE (temporary erase) and TMPY INSERT prompts. The
changes to the flight plan will be shown in amber on the ND.
Pres TMPY ERASE to eliminate the changes or press TMPY
INSERT to make the changes permanent into the flight plan.
Also a new feature, ONCE UNDO/THEN ERASE allows
changing only the last change made. Each press will undo
only the last step until you are down to the original change
and only TMPY ERASE will be shown.
There is no NEXT PAGE with F-PLN.
A very nice new feature allows all route programming to be
done at the same time on one page. Once you press a LSK
for a fix you can continue to enter route or fix changes on
the new page until complete. You do not have to jump back
and forth. Just enter the route in the VIA box (for example,
J80) on the left side and the next fix in the TO box (for
example, DBL) on the right side. You may continue with the
next route (for example, J80) and fix (for example, OAL) until
done. Then select the back to the TMPY F-PLN page once
there ERASE or INSERT your changes.
Along Track waypoints are now available in FMS2. You may
build a new fix such as for crossing restrictions based on a
current fix in the flight plan. For example, if cleared to cross
　
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