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and we will look at that in a moment. If you are in NAV mode and reach a
discontinuity in the flight plan the autopilot will just drop to heading mode on the
current heading or entered heading if one is entered in the FCU. Note that the
Heading “window” will only hold a heading for 45 seconds (who knows why!)
The scratchpad is the bottom line of the MCDU and is where you will enter data.
After you type info into the scratchpad you will then select it up into the FMGC by
using the LSK (Line Select Keys) on either side of the MCDU. Note that you
cannot select data from the FMGC into the scratchpad. You will also get various
warnings in the scratchpad and they can be cleared by pressing the CLR key in
the bottom right hand corner of the keys.
US Airways Airbus A319, A320, A321 Notes
64
AIRPORT Key: The AIRPORT key simply allows the pilot quick access to any
airport that is entered into the flight plan. This would include the departure airport,
arrival airport and the alternate airport. Press this key and the display will place
the next available airport in the FMGC flight plan on the first (top) line in the
MCDU. This just gives the pilot a fast way to “scroll” the flight plan display to the
next airport.
NEXT PAGE Key: The NEXT PAGE key gives access to additional information
for some screens when there is more than can be shown on one screen. Think
of NEXT PAGE as scrolling horizontally. The F-PLAN and INIT screens use the
NEXT PAGE function. When there is more than one page the pages are referred
to as PAGE A and PAGE B as in INIT PAGE B. This would require you to select
INIT and then press NEXT PAGE to access INIT PAGE B.
 Keys: The  keys (up/down arrows, slew keys) allow the pilot to scroll a
page vertically. You will also use them for changing values. This is most
commonly used when adjusting the LAT/LONG that is stored for the airport to
the gate value when initializing on INIT. You will also very commonly use them
for scrolling the F-Plan screen to see waypoints that continue in the flight plan
beyond the MCDU screen display.
DIR Key: The DIR key allows the pilot to go direct to any waypoint entered. The
TO waypoint will become whatever is entered as the direct and the FROM
waypoint will become a T-P (position the aircraft is at when the DIR is entered).
You may either press the LSK next to the direct fix or type the fix in the
scratchpad and press the DIR TO LSK.
PROG Key: The PROG key will actually access a number of different pages
depending on the phase of flight you are in. In every case you will see a PROG
page but the name will change depending on the phase. For example, when in
cruise flight the page will be name PROG CRZ and in climb PROG CLB and so
forth. This PROG page along with F-PLAN will be used most of the time when
you are not accessing some other page. The PM should have PROG on their
side unless they need something else.
The PROG page will show the planned cruise altitude (as loaded during INIT or
as modified) as well as the optimum cruise altitude and the recommended
maximum altitude. Optimum (OPT) is based on cost using the COST INDEX you
entered. Recommend Maximum (REC MAX) is based on 1.3 G protection and
should only be used in smooth air.
You may change the planned cruise altitude anytime by coming to any PROG
page.
Another handy feature is the Bearing / Distance to feature. Just put in any airport
or fix and you can immediately see how far you are from it and what heading to
US Airways Airbus A319, A320, A321 Notes
65
take to it. Even better, this is one of the few features that does not “crosstalk”
with the other FMGC so each pilot can load a different fix to use. This is a great
place to come when planning a crossing restriction before you get it loaded into
the Flight Plan to be sure you won’t miss the fix.
Finally, PROG is also where you will change the required accuracy for RNAV
GPS approaches.
PERF Key: The PERF key allows the pilot to see and enter data for the various
phases of flight. You will use this key when initializing to enter takeoff information,
changing climb, cruise and descent speeds and entering approach data. Only
the preflight and done phases do not have pages. Press the PERF key and then
press the LSK at the bottom of the screen to move to the next or previous phase
page. If you aren’t sure what phase the FMGC is in just look at the top of this
page as each phase is named here. For example in takeoff phase the PERF
page is named PERF TO page and in cruise it is named PERF CRZ page.
RADNAV Key: The RADNAV key stands for Radio Navigation and is the page to
　
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