Honeywell KFC225 autopilot roll servo failure

In sci.electronics.design Peter wrote:
I've just had my 6th failure of the roll servo, since 2002.

"Doctor, it hurts when I do this."
"Then don't do that."

Can anyone offer me any info

Try
http://www.rockwellcollins.com/produ...ols/index.html
maybe?

Matt Roberds

Peter wrote:
I've just had my 6th failure of the roll servo, since 2002. This time
I got a video of it, showing that the power-up tests pass even with a
dead roll servo:

http://www.zen74158.zen.co.uk/misc-f...ure-2005-1.mpg

Evidently Honeywell have not fixed this - even though the KFC225 has
failed on every aircraft whose owner I have managed to contact over
the last few years.

Can anyone offer me any info on this servo, e.g. schematics? I already
have the KFC225 main unit schematics so I have the interface (which is
very simple).


Peter.
--

Did you contact Honeywell in Phoenix Arizona?

Mark

On Sat, 24 Sep 2005 01:37:37 GMT, wrote:

In sci.electronics.design Peter wrote:
I've just had my 6th failure of the roll servo, since 2002.

"Doctor, it hurts when I do this."
"Then don't do that."

Can anyone offer me any info

Try
http://www.rockwellcollins.com/produ...ols/index.html
maybe?

Matt Roberds


Hmmm...RC try to be customer-responsive these days, but I CAN remember
when they upgraded the FMS 800 and the roll command (used to steer to
the desired track), was reversed from its previous polarity - made for
interesting waypoint/turn capturing!

Brian W.

On Sat, 24 Sep 2005 07:06:20 +0100, Peter
wrote:


wrote

Try
http://www.rockwellcollins.com/produ...ols/index.html
maybe?

Well, yes, I am sure if I went through the massive paperwork exercise
and installed something like that, or S-TEC, it would work just fine.

It has to be said that the KFC225 does a super job of controlling the
aircraft, even in pretty bad turbulence. It just keeps packing up. I
am on my 3rd main unit, too (the built-in altimeter and pitch gyro are
prone to packing up)


Have you monitored bus voltage n transients? There is a role for a
high power series resistor in servo drives! :-)

Brian W

On Sat, 24 Sep 2005 07:06:20 +0100, Peter wrote:


wrote

Try
http://www.rockwellcollins.com/produ...ols/index.html
maybe?

Well, yes, I am sure if I went through the massive paperwork exercise
and installed something like that, or S-TEC, it would work just fine.

It has to be said that the KFC225 does a super job of controlling the
aircraft, even in pretty bad turbulence. It just keeps packing up. I
am on my 3rd main unit, too (the built-in altimeter and pitch gyro are
prone to packing up)

Speaking of that, were you in on the thread about autopilots and
hijackers? Is it true that autopilots can land airplanes so precisely
that they had to introduce dither so that they didn't wear ruts into
the runways from all of the airplanes landing in the same spot?

Thanks,
Rich

"Rich Grise" wrote in message
news
Speaking of that, were you in on the thread about autopilots and
hijackers? Is it true that autopilots can land airplanes so precisely
that they had to introduce dither so that they didn't wear ruts into
the runways from all of the airplanes landing in the same spot?
Thanks,
Rich
I heard that the F14s now land so accurately on the carriers that the centre
arrester cable has to be replaced often, but the others show no signs of
wear
at least that's what the man in the black helicopter said...

"neil" wrote in message
.uk...
"Rich Grise" wrote in message
news
Speaking of that, were you in on the thread about autopilots and
hijackers? Is it true that autopilots can land airplanes so precisely
that they had to introduce dither so that they didn't wear ruts into
the runways from all of the airplanes landing in the same spot?
Thanks,
Rich
I heard that the F14s now land so accurately on the carriers that the
centre arrester cable has to be replaced often, but the others show no
signs of wear
at least that's what the man in the black helicopter said...
Must have, seeing that the last F-14 was retired some years ago.

Matt Barrow wrote:


Must have, seeing that the last F-14 was retired some years ago.


Matt, check out "Background" on this page:

http://www.navy.mil/navydata/fact_di...&tid=1100&ct=1

Happy Flying!
Scott Skylane

neil skrev:

"Rich Grise" wrote in message
news
Speaking of that, were you in on the thread about autopilots and
hijackers? Is it true that autopilots can land airplanes so precisely
that they had to introduce dither so that they didn't wear ruts into
the runways from all of the airplanes landing in the same spot?
Thanks,
Rich
I heard that the F14s now land so accurately on the carriers that the centre
arrester cable has to be replaced often, but the others show no signs of
wear
at least that's what the man in the black helicopter said...

The pilot is graded for every landing and, I believe, needs to maintain
a
certain average if he wants to keep flying. They are surposed to hit
that
cable on a good landing so I'd assume they get pretty good at it


-Lasse

"Scott Skylane" wrote in message
...
Matt Barrow wrote:


Must have, seeing that the last F-14 was retired some years ago.
Matt, check out "Background" on this page:

http://www.navy.mil/navydata/fact_di...&tid=1100&ct=1

Background
Current plan is to have Tomcats in service until mid-FY07. Tomcat squadrons
have already started to transition to the F/A-18 E/F Super Hornet aircraft,
and will continue to transition in a phased approach.

That WAS the PLAN, back a couple years ago when the article was written, but
I recall (for what that's worth) that the last one was retired (for carrier
operations?) and the advanced Hornet was accelerated into operations. Wasn't
that a thread here just a few weeks ago?


--
Matt

---------------------
Matthew W. Barrow
Site-Fill Homes, LLC.
Montrose, CO