King autopilot and GPS approaches

To wit: The LOC has false nulls. Note how it looks
as you fly around the place--swithing back and forth in a seemingly
random way.

A place where it really matters: Jackson Hole WY. There you need to
position yourself on the loc using other navaids.

Thanks. Good point.

Jose
--
Get high on gasoline: fly an airplane.
for Email, make the obvious change in the address.

On Apr 5, 8:51 pm, "Viperdoc" wrote:
My understanding is that at least the KAP 200 and 225 will not track a
glideslope (either from an LNAV+V, an LPV, or an ILS) approach when
intercepting from above, which is also my experience.

I also observed that adjusting the altitude with the autopilot up/down
switch will negate the glideslope intercept even from below while in
approach mode. Have you seen this behavior as well?

The 200 should intercept from above if in attitude mode. Does not
know what glideslope is in use.

You can demonstrate this: but it takes a whale of a descent to set it
up.
You need to pass thru the gs center to make it couple. It's a bad
idea
in any event.

The 225 will do the same thing on ILS but not sure about GPS
approaches.

Bill Hale

My experience is that the GS has to be intercepted from below in order to
couple (also true for the 225). Also, it seems like use of the pitch toggle
while in approach mode will prevent the AP from capturing the GS.

This has happened on multiple occasions when given a late vector to
intercept, along with an altitude change, while already in NAV or HEADING
mode, with the APP mode armed. In other words, using the toggle switch for
pitch on the AP master panel while in APP mode seems to prevent the AP from
sensing and capturing the GS. This has been true for ILS as well as GPS
(LNAV/VNAV or LPV) approaches.

My only thought was to not engage the APP mode until the final altitude is
attained for GS intercept.

So, the main question is: with a King 200 AP, does the use of the pitch
toggle switch on the master panel while in APP mode negate GS tracking? How
about the CWS?
Does a switch from APP to NAV and back to APP then allow GS tracking?

On Apr 8, 6:19 am, "Viperdoc" wrote:
My experience is that the GS has to be intercepted from below in order to
couple (also true for the 225). Also, it seems like use of the pitch toggle
while in approach mode will prevent the AP from capturing the GS.

This has happened on multiple occasions when given a late vector to
intercept, along with an altitude change, while already in NAV or HEADING
mode, with the APP mode armed. In other words, using the toggle switch for
pitch on the AP master panel while in APP mode seems to prevent the AP from
sensing and capturing the GS. This has been true for ILS as well as GPS
(LNAV/VNAV or LPV) approaches.

My only thought was to not engage the APP mode until the final altitude is
attained for GS intercept.

So, the main question is: with a King 200 AP, does the use of the pitch
toggle switch on the master panel while in APP mode negate GS tracking? How
about the CWS?
Does a switch from APP to NAV and back to APP then allow GS tracking?

Use of the rocker does cancel GS tracking. I wonder if it also
cancels
GS intercept if operated before the GS intercepts? I'd hope not.

For example: Say you are in the alt mode before GS intercept. You
use the rocker to change altitude 100'. Shouldn't affect the
intercept.

Say you are in att mode, = not altitude. You haven't intercepted
yet.
Seems you could change the intercept attitude before the intercept.

After it couples, seems you can't use the rocker (or cws) without
decoupling the GS. The message then is that you want some other
attitude than that selected by GS couple.

I'll believe these statements are correct. I'll have to verify them
next
time I'm in a plane with a 200. The thing is full of combinational
logic--you are on your own!!

Bill Hale