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check when you wish to determine which navaids are being tuned. Normally the
Airbus will autotune the radios and you will not be aware of what navaids are
being utilized. However, there are times that you will need to “lock” a frequency
for tuning, such as when a DME is used for departure on a SID. Just press the
RADNAV key and then type the navaid identifier (you may also use the
frequency by using a leading slash, for example /115.0) in the scratchpad. Then
select the identifier to the VOR1 or 2 LSK at the top of the MCDU. This will keep
that side tuned to that frequency. You can use the DDRMI to see raw data. The
“locked” identifier will be in LARGE letters.
FUEL PRED Key: The FUEL PRED key allows the pilot to view fuel prediction
info on destination, alternate and fuel management data. This is the page to use
to enter Weight and Balance data. If the INIT page B is showing on the MCDU
on engine start the FMGC will automatically “rollover” to FUEL PRED for weight
data to be entered. Gross weight and CG data are entered on LSK 3L. For
example, 144,190 lbs. with a MAC of 23.2 would be entered as: 144.2/23.2
INIT Key: The INIT key is used when getting ready during preflight. You initialize
the FMGC from this page. This page will be gone over in more detail later.
SEC F-PLN Key: The SEC F-PLN key allows the pilot to have a second flight
plan to use for what-if scenarios or to load anticipated changes that might occur
in the primary flight plan. You are able to copy the primary flight plan in order to
make changes to it or you can program a new flight plan.
 Airbus Gotcha: If the initial fix in the Secondary flight plan is different from
Active flight plan you must be on Heading to activate. You cannot change an
active NAV segment while NAV is engaged.
US Airways Airbus A319, A320, A321 Notes
66
DATA Key: The DATA key will allow the pilot to view the various sources of data
for the FMGC and determine whether it is valid or not.
MCDU MENU Key: The MCDU MENU key allows selection whether to work in
FMGC or ACARS or another area such as AIDS. Only one MCDU can be set to
ACARS at one time. If the opposite side is selected to ACARS then you will
“locked” out of ACARS until it is selected back out of ACARS.
CLR Key: The CLR (clear) key is a delete key. You can use it to delete
characters or phrases in the scratch pad or to delete data from the FMGC. To
clear the scratch pad just press the CLR key and the last entered character will
be deleted. If you continue pressing the entire phrase in the scratchpad will be
cleared. The CLR key can also get rid of warning messages. To delete data
entered into the FMGC press the CLR key while there is nothing in the
scratchpad. CLR will be entered into the scratchpad. Now select CLR to the LSK
that corresponds to the data you wish to delete. This is how to delete a
discontinuity. Press the CLR key and then press the LSK that corresponds to the
discontinuity and it will be deleted with the waypoints on either side of the
discontinuity now joined as a segment.
OVFY Δ Key: One of the more obscure keys on the MCDU, the Overfly key has
basically only one function. When you are coming up to a waypoint the FMGC
will normally compute the turn at the waypoint and due to the radius of the turn
the aircraft may begin its turn early to be able to turn smoothly onto the airway
centerline. There may be times that you need to actually fly exactly over the fix
before turning. In those cases press the OVFY Δ key and then line select it up to
the appropriate fix as a lateral revision. The FMGC will now make sure to fly
directly over the fix even if it will cause overshoot on the far side of the turn.
Well, OK, there is one other function for the Overfly key. When using freetext in
ACARS you will use the overfly key to put a space in the text as you would use
the space bar on a word processor.
US Airways Airbus A319, A320, A321 Notes
67
Pseudo Waypoints (PH 17.3.3)
OK, besides just sounding weird what are pseudo waypoints anyway? Basically
they are lines of information on the Flight Plan page that are not something that
you can navigate to. They are mostly to do with vertical profile information and
are therefore not for lateral navigation. Pseudo waypoints on the MCDU will
consist of the following:
T/C – Top of Climb (hockey stick)
T/D – Top of Descent (hockey stick)
S/C or S/D – Start of Climb or Descent for Step Climb/Descent (hockey stick)
SPD LIM – Speed Limit (M&M)
DECEL – Deceleration to approach phase (circle D brand)
I/P – Intercept Point (lightening bolt)
　
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