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as arming an approach or turning off the flight director or autopilot make sure
you look at FMA (at the top of the PFD) to see what mode you actually are in.
Airbus Gotcha: If you cannot get the proper ILS frequency and course
showing on the PFD when you select the ILS pb, then check your RAD/NAV
page and see if a navaid has been entered and is locking out autotuning. Also be
sure that an RMP NAV pb is not selected as this will turn on the NAV backup
mode and disable FMGC tuning. This can simply “glitch” and not display when it
should. We were able to fix it by reselecting the runway/approach.
US Airways Airbus A319, A320, A321 Notes
89
On all instrument approaches (except CAT II,III) PM calls “100 above” and PF
replies “Continuing”. At minimums PM calls, “Minimums, runway in sight” or
“Minimums, no contact”. PF responds to minimums calls with either “Landing” or
“Go Around”.
Remember: WAFPPC for working in the sim.
Weather (check destination weather, make plan)
Advise (ATC, F/A’s, company)
F–PLN (insert new destination if needed, then new approach)
PROG (if RNAV approach, insert .3 nm RNP)
PERF (ACTIVATE and CONFIRM, then insert approach data on PERF APPR)
Checklist (call for Descent - Approach checklist)
It may be helpful to notice a “backward Z” flow to the keys on the MCDU when
doing the F-Plan, RADNAV, PROG and PERF for the approach. You can use
this “backward Z” for any PRELIMINARY checklist flow.
VAPP (PH 18.6.5)
The approach speed is automatically computed by the FMGC (of course!). This
VAPP Target is shown on the PFD airspeed scale as a magenta triangle. VAPP
is shown on the PERF APPR page on the FMGC. It is computed by taking the
highest of two different figures. After you enter the steady state winds (no gusts)
and the approach runway the FMGC figures the headwind component. It then
takes 1/3 of the headwind and adds this to VLS. However, VAPP cannot be less
than 5 kts. above VLS or more than 15 kts.
VLS + 1/3 headwind component = VAPP
So for runway 18 a wind of 180 at 30 kts. would result in a VAPP of +10 kts. If
VLS is 120 then VAPP would be 130 (+10).
With runway 18 and wind 270 at 20 the VAPP would be +5 as a minimum of plus
5 must be added and a crosswind adds no additional speed.
Now comes the other way to figure VAPP Target, the infamous GS Mini. While it
sounds like either a new Mini car or a new mini-skirt style it will actually figure the
safest minimum ground speed for your approach. Remember, the GNADIR’s
know your ground speed and the wind the aircraft is experiencing at the moment.
You entered the runway so it can now know what the ground speed should be on
approach. GS Mini takes the VAPP that has been already figured (130 in our
example) and then subtracts the whole headwind component from it. This leaves
only the ground speed and the previously added 1/3 wind “cushion” of 10 kts, so
in this case 130 – 30 = 100 kts. ground speed. While this sounds slow remember
US Airways Airbus A319, A320, A321 Notes
90
that VLS was 120. If we had a head wind of 30 kts. that would result in a ground
speed of 90 kts. So you can see that the “cushion” has actually added 10 kts. to
the minimum ground speed. If the FMGC sees the ground speed going below the
minimum of 100 kts. then it will increase the VAPP Target to maintain the
minimum ground speed. This will ensure that even if all headwind was lost at
once that the aircraft has sufficient energy to fly through the loss of speed. GS
Mini may increase the VAPP beyond the normal plus 15 limit to maintain the
minimum ground speed required.
VAPP – headwind component = GS Mini
The VAPP Target will be the higher of these two airspeeds, VAPP or GS Mini.
One point to remember when putting in the wind component. It won’t help you to
“cheat” and put in a greater wind than actually exists. Putting in a greater wind
speed will actually result in a lower GS Mini (remember the FULL wind speed is
subtracted from VAPP) which will result in less protection on approach. If you
wish to increase the VAPP Target it is better to simply enter the desired VAPP
speed on the PERF APPR page while using accurate wind numbers.
While the FMGC will add airspeed for headwind components it will not add
anything for crosswinds. It will be up to you to add anything to VAPP on the
PERF APPR page if you have heavy crosswinds and you wish to have additional
airspeed on the VAPP Target.
You will only have VAPP target shown when in APPR phase. You can force the
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