Re: Old, but interesting topic

Flydive <nospam@xxxxxxxxxx> wrote in news:460ea9f8_4@xxxxxxxxxxxxxxx:

Bertie the Bunyip wrote:
Flydive <nospam@xxxxxxxxxx> wrote in news:460e4afa_1@xxxxxxxxxxxxxxx:

Bertie the Bunyip wrote:
Why not?
It autotunes the frequency and selects the inbound course of the
approach you have selected, it does about 20 miles out.

You can override it anytime, you check it during your approach
briefing.
It does not follow it unless you arm the approach on the panel.

I don't see any problem with it, as with anything on the aircraft
you
have the ultimate control, I let the autopilot fly the aircraft
most
of
the time, but I always monitor what it does.
Well, you have to.. obviously. They do strange things from time to
time..

Didn't mean to suggest you didn't. But the way you said it sounded
like
you would let it nav onto the ils and fly it off it's own bat not
using
the ILS at all, just it's own input like an LNAV non precision.
We don't even allow LNAV intercepts of ILS's. We always intercept
from
heading select, though we do allow a glidepath intercept from vnav
from
below. I wouldn't trust the fjukkwit to do that, though. I wouldn't
let
him use a toaster, in fact.



Bertie
Well I agree not to trust it blindly, computers are computers.

True that most of the time you intercept using heading mode, most of
the
time you are on radar vectors.

But when you are not on vectors and you are using the nav fuction to
follow the STAR, you can leave the panel on NAV, the FMS will
autotune the ILS frequency, set the imbound track, as the LOC comes
alive the flght director will switch to "green data" intercept the
LOC and the Glide path using the navaid. All that can be done on
autopilot. As I said, all the time the pilot will monitor it, and of
course
manual
intervention is still needed to configure the aircraft and
ultimately
to
land it.

No, I can't do that. For one thig, it's company policy we don't do it
in any of our airplanes, and for another, the possibility of a
parralell intercept due to even a minute amount of map shift is too
great, so I just wouldn't..

Bertie

Well, company policy is one thing, what the technology can do is
another. The map shift has nothing to do with it, the FD will
intercept the localizer signal and follow is just as it would if you
would tune it manually and intercept it on heading select.

no it won't, not if it intercepts the FMC track first and thats not in
the same place as the runway.


As you intercept the LOC you will not be using the FMS commands
anymore but the navaid signal.


IF you intercept it. That's the point and that's why we don't allow it.
We also consider it to be good practice re: pilot machine interface.
You're more in theh loop. Hdg sel only comes on when you're within a few
miles of interception if you're not already on it.


Bertie
.

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