|
Flying with Autopilot,
ATC & ILS |
|
|
Last updated : 22MAR02
I have had a few requests for information
on this kind of stuff, so here is what
I know.
I didn't know a thing about any of this
until FS2002 came out, so if there are
any mistakes, I did it on purpose to make
you crash!
As usual, I have aimed it at people who
know nothing. This is the safest option
& also makes me feel clever! (ha ha)
Using the ATC (Air traffic control) is
a good way of learning about navigating
your way to an airport & how to position
yourself for a fail-safe ILS approach.
Use the ‘flight planner’ menu option to
select your departure & destination
airports.
Make sure you chose an IFR flight (Instrument
flight rules).
The ATC is very simple & works purely
on multi choice.
It works in the same way for all the available
requests & acknowledgments. It automatically
handles all your communications radio tuning
& the transponder settings.
This text assumes that you are flying an
average jet airliner.
Weight plays an important part in performance,
particularly when landing. If possible
you should set your fuel levels accordingly
before you takeoff. But since this is FS,
you can get away with just reducing your
fuel levels as you approach your destination.
|
|
|
The COM & NAV Instruments
A brief description of the instruments
& what they do.
COM1 & COM2
radios
These are two way communication radios.
Two COM radios are not essential. COM2
can either be used as a backup, or it can
be tuned to a different frequency. For
example you could set COM1 to the tower
& COM2 to the Information service,
if you really wanted to.
I just ignore COM2.
Each radio will usually have a ‘live’ frequency
& a ‘standby’ frequency. This is so
that you can preset a frequency, while
staying tuned to another. When you want
to use the new one, you flick the switch
in between the two & the frequency
values swap over.
NAV1 &
NAV2 receivers
These are for receiving signals from
navigation beacons.
There are basically 3 types of beacon -
VOR, ADF & ILS.
You can tune to two different beacons at
the same time with NAV1 & NAV2.
VOR - Very high frequency Omnidirectional
Range
This beacon has a separate beam for
every heading degree of the compass.
There are a few different flavours of VOR
beacon, but all are similar in function.
Most will support DME (Distance Measuring
Equipment). This information is displayed
by your DME instrument gauge & will
show distance to the beacon, ground speed
& estimated time to the beacon. ILS
also has the DME function.
If you tune NAV1 or NAV2 to the frequency
of the VOR beacon, the VOR instrument will
automatically display the direction to
you. On the VOR instruments that I use,
the single lined arrow is for NAV1 &
the double lined arrow is for NAV2.
ADF - Automatic
Direction Finder.
This beacon is more simple device &
predates VOR. It is still in operation
at a lot of smaller airfields.
It needs to be tuned in using the separate
ADF receiver. This is found on the radio
stack.
It sends a signal which is picked up by
the ADF instrument. This is similar in
appearance to the VOR instrument. It shows
the direction of the beacon, in relation
to the nose of the aircraft. ADF will not
give you DME information.
ILS - Instrument
landing system.
This is a two part beam that is situated
at the end of a runway.
The localizer is similar to a single beam
of a VOR & it has DME capability. It
guides the aircraft along the runway heading.
The glideslope is a single beam that guides
the height of the aircraft, right down
to the numbers on the runway.
If the ILS frequency is entered into NAV1,
the ILS information is automatically shown
on the big Horizontal Situation Indicator
on the main instrument panel.
NAV2 may not be equipped to use ILS information
in some aircraft.
Autopilot
The autopilot will hold the aircraft
in a set situation.
It has a number of activating buttons,
most with their own input settings.
HDG - This holds the set heading, performing
any turn needed to get on course.
ALT - This holds at the set altitude.
Climb rate - Situated next to the ALT setting,
it gives the rate at which the aircraft
climbs or descends until it reaches the
ALT setting.
IAS - This holds the indicated air speed
APR - This will hold the aircraft to an
ILS beam.
These settings can be altered at any time,
allowing you to fly purely by using the
autopilot.
There will be a master switch to engage/disengage
the autopilot. This saves you having to
press all of the individual buttons to
turn it on or off.
There is also usually a master switch for
the autothrottle. This needs to be switched
to use the autothrottle. Some aircraft
will not have autothrottle.
The autopilot can have some other functions,
but these are the main ones.
Some autopilots will also make use of a
full flight plan, but I do not use that.
Transponder
This works as an Identifier for your
aircraft for ATC. It can be set using the
radio stack, but the ATC will automatically
set it for you when you get your IFR clearance.
The number is known as your Squawk.
|
|
|
Pushback & Taxi
You press the apostrophe key (')
to bring up the ATC window (Nice choice
there from Microsoft ???).
I usually shrink the window & put it
in the top right hand corner, out of the
way.
After asking for & getting IFR clearance,
you must ask for & get taxi clearance.
This is all done by mutli choice options
from the ATC window.
To push back from the gate, you press ‘Shift-P’
FS2002 gives you the choice of turning
during pushback, but is not very friendly
about it.
Pressing ‘1’ means turn to the pilots left,
‘2’ means turn to the pilots right.
Remember you will be going backwards!
Before you push back, find out which way
you need to turn. When you are ready, press
‘Shift-P’, then immediately press ‘1’ or
‘2’. If you take your time over it, it
will not work.
If you do not know the way to the runway
you can select ‘Progressive taxi’ from
ATC.
This gives you a pretty pink line to follow.
While you are taxiing to the runway, get
your autopilot set ready for when you leave.
Enter the altitude (ALT) as given by ATC
& set your indicated airspeed (IAS).
I always set the IAS value to 250kts initially,
as this is the speed limit below 10000ft.
Depending on which aircraft you are flying,
you should set the Rate of climb (located
next to ALT) as between 1000-2000 ft/min.
Select your takeoff flaps setting, usually
1 notch or sometimes 2.
Set a little bit of upwards trim, to help
give the elevators enough force to rotate
the aircraft. It usually only needs half
a mark of trim on the gauge.
If the aircraft lifts off without you rotating,
you probably used too much trim. FS is
not very realistic with a lot of trim set.
ATC will have instructed you to hold short
of the runway. So when you get there stop
& request takeoff clearance.
|
|
|
Takeoff
You must request & get takeoff
clearance.
ATC will usually have instructed you to
fly the runway heading after takeoff, so
as you get onto the runway, set your autopilot
Heading (HDG) to point in the direction
of the runway.
The HDG direction is shown (usually by
a rotating arrow) on the Horizontal Situation
Indicator. Make sure it is pointing straight
forward.
Leave the autopilot & autothrottle
switched off for takeoff.
Check your autopilot HDG, IAS, ALT &
Climb rate settings.
Make sure that the autopilot buttons for
HDG & ALT are lit, ready for use.
Make sure that no other autopilot buttons
are wrongly lit, especially APR.
Check your flaps setting is correct.
Check your spoilers are not out.
Check your trim is set slightly up (it
usually points down on the instrument itself)
Apply power & off you go.
You should really find out the correct
rotation speed for the aircraft you are
flying, but it will usually be around 130-150kts
for a jet airliner.
As soon as you leave the ground (watch
the VSI gauge), retract the gear, then
activate the autopilot & autothrottle.
You should keep a careful watch on the
speed. A good rule of thumb for flap retraction
is to pull the flaps up a notch whenever
the acceleration starts to slow.
If the aircraft is not able to hold speed,
reduce the climb rate until it can hold
speed.
Always remember that the autopilot does
not really know what it is doing. If it
is not behaving as you expect, try resetting
the values or turn it off & back on
again.
It is the pilots fault, if the autopilot
crashes the plane!
|
|
|
Cruise
Listen out for your ATC instructions.
Follow them by adjusting the HDG &
ALT settings on your autopilot.
Over 10000ft you can increase your speed
as you wish, but no one will tell you off
if you do it lower. At higher speeds &
altitudes it makes more sense to use Mach
hold instead of IAS hold, on the autopilot.
Normal rates of climb/descent are between
1500-3000 ft/min. It depends on the aircraft’s
capability, some can do more.
Remember to slow down before you get to
your destination!
|
|
|
Approaching the airport
ATC will tell you which runway you
are to land on. Make a note of it.
Find your destination airport on the map
view.
Zoom in until you can see the runways &
their numbers.
Click on the runway you want. A list box
of information will pop up.
Scroll down to the bottom & you will
find the list of runways. Make a note of
the heading & ILS frequency of your
runway. Cancel the map view.
Enter the runway heading into the NAV hold
on the autopilot, but do not select the
NAV hold button. The NAV setting here only
makes the Horizontal Situation Indicator
point the right way.
Enter the frequency of the ILS into the
NAV1 control (Some models need to bring
up the radio stack window to do this.)
As you get under 3000ft you will want to
be at around 200kts, ready for approach.
ATC will guide you a lot better if you
keep to a stable slow speed of around 200kts.
Intercepting the ILS should be done at
around 2300ft above the ground & below
200kts.
If you look on a map or GPS display, you
should be aiming to intercept just before
the green beam begins. If ATC is aiming
you too close, adjust course yourself.
You are responsible for getting it right.
Take a look at your DME instrument. It
should show the distance from the beam,
the ground speed & the estimated number
of minutes to get there. The DME will do
this for any beacon (ILS or VOR) that you
tune into & that supports the DME standard.
ATC will bring you in at a slight angle
to the localizer beam. As you approach
it, make sure that your compass instrument
is showing the correct direction &
beam indication.
If it all looks right then press the autopilot
approach hold button APR.
|
|
|
Landing
You must have pressed the approach
hold APR button well before you get to
the beam line.
You should be slowed down under 200kts,
but not at full landing flaps.
As you intercept the beam, the HDG light
will go out on the autopilot. This is supposed
to happen & means that the ILS localizer
has taken over that function.
The aircraft will turn onto the beam.
You should see the glideslope indicator
showing that you are below the glideslope
beam.
This is normal, as you always intercept
the glideslope from below.
As you get closer to the glideslope, slow
down nearer to your landing speed (130-160kts
is usual for landing speed, depending on
aircraft type & weight).
As the glideslope indicator begins to come
down, you should be ready to select full
flaps.
Some aircraft will not fly level very well
with full flaps selected, so it can be
better to select full flaps after intercepting
the glideslope.
When the glideslope is intercepted, the
aircraft may dip down too far. You do not
have to sit there & let it do this!
Encourage it level using the elevator controls,
they still work.
Either way, if you are not going too fast
or too slow, the aircraft should settle
onto the glideslope beam. Make sure you
now have full flaps, are at the correct
landing speed & have your gear down.
Arm the autospoilers.
Decision height will be indicated on your
instruments, when you reach it.
I usually turn off autopilot & autothrottle
here, they have done their job & the
aircraft should be on a stable descent.
Throttle back as you get over the threshold
& reduce rate of descent to about 300
ft/min.
On landing, throttle right back & select
reverse thrust (F2 key).
If you let the autopilot land the aircraft,
be aware that it will not perform any sort
of flare & you may hit the ground harder
than is desirable. It can even hit nosewheel
first & cause the gear to collapse.
If your aircraft sinks into the runway,
the gear has probably failed.
You can easily put in a manual flare, using
the elevators.
If you do a fully automatic landing, you
must turn off autopilot & autothrottle
as soon as you touch down.
After a few seconds, release the reverse
thrust & use wheel brakes as needed.
Disarm the autospoilers & put the spoliers
down.
Flaps up.
Taxi to gate, using ATC progressive taxi
if needed.
The end
|
|
|