Today's Message Index:
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1. 04:25 AM - Re: Key start switch/magneto problem (Ralph Hoover)
2. 04:40 AM - Re: ACE9011 (Ken)
3. 06:51 AM - Re: ACE9011 (Robert L. Nuckolls, III)
4. 06:35 PM - PS Engineering PTT issue (Greg Papendick)
5. 08:51 PM - STS hand held (Rick Pearce)
Message 1
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Subject: | Re: Key start switch/magneto problem |
Several avenues exist to isolate this problem.
1. Is the Grand Rapids Tach pick off isolated with a resistor ? If so
will grounding the Grand Rapids end kill the Mag. If not you can
eliminate the Grand Rapids as the root cause. If it is not isolated
check with Grand Rapids for recommendations.
2. With the tach pick off eliminated disconnect the P lead from the Mag
and connect an Ohm meter. On the lowest scale the switch should show a
short when in the off or left positions. with the switch in both it
should be open. Now do the wiggle test. If you do not see a short appear
don't quit!!
3. Have you used shielded wire for the switch connection? Visually
verify the points where the shield is terminated. Neatness is the key
here. Are there any whiskers of the shield loose. Has the center
conductor been nicked?
4. Check the length of the wire for damage. If it is pinched or chaffed
then you could develop a short.
5. The least likely would be foreign material floating around inside the
Mag switch but if nothing else is found I would visually inspect the switch.
6. The last unlikely thing would be a bad Capacitor, Coil or foreign
material in the Mag.
7. If the Grand Rapids was not isolated and you isolate it then an
intermittent on the GR side may still allow the tach function to fail
without killing the mag. If this occurs a similar look at wiring to the
GR is in order.
The school of thought that it must be in the failure mode to find it is
partially true but I suggest that in such a simple installation that the
root cause of the problem will be obvious if you look close enough.
Remember It's only magic until you understand.
--
Ralph C. Hoover
RV7A
hooverra at verizon dot net
Message 2
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Lately there have been a number of large attachments posted. We dial up
guys would sure appreciate it if you just put a link to whatever
diagram, picture, or pdf so that we can download it at our convenience
if we are interested. Or we may already have it on our hard drive.
thank you
Ken
do not archive
> Is this unit, (ACE9011), suitable for use on an internal regulated
> alternator, and if not, what should I do to reduce my vulnerably to
> over voltage on a Van's 60 amp alt?
> Thanks,
Message 3
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At 07:45 PM 4/17/2007 -0400, you wrote:
>Is this unit, (ACE9011), suitable for use on an internal regulated
>alternator, and if not, what should I do to reduce my vulnerably to over
>voltage on a Van's 60 amp alt?
>Thanks,
>Sam Marlow
No, the AEC9011 is for externally regulated
alternators and generators including the
permanent magnet systems.
An internally regulated alternator either
requires modification to bring field control
wires to the outside or adding some external
means of exercising absolute control over
the alternator. See:
http://www.aeroelectric.com/articles/Adapting_IR_Alternators_to_Aircraft.pdf
If you're interested in using the AEC9004
under development, you can install the interim
technique described on the second sheet of
the document cited above. This will lay
the groundwork for an easily installed
AEC9004 system when it becomes available.
Bob . . .
Message 4
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Subject: | PS Engineering PTT issue |
A friend at the airport has a PS Engineering PMA6000 in his Cherokee.
It had been working fine but after some work was done under the panel
the Pilot could no longer transmit. The intercom works fine but as soon
as you press the PTT button the pilots mic stops transmitting. It looks
like it could have something to do with the PTT maybe grounding out the
Mic audio? Any suggestions on where I might look if the jack is OK?
Thanks in advance for any assistance
Message 5
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I'm a regular on the Matronics Kolb web sight.
I have a STS hand held and a Flight Tech ITC-2001-ENRI intercom with
Flightcom Blackhawk 50x head sets. I could not find a patch cord to hook
up the radio. So I took it to a local aircraft radio repair shop to have
one made. The tech. is telling the two are not compatible, all he got
was a squeal. Can any one tell me if this is true? I came away with the
attuide that he just didn't want to screw with it. If they are
compatible does any one have a schematic?
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