Today's Message Index:
----------------------
1. 04:55 AM - Re: Transpondertest (Art Zemon)
2. 07:13 AM - Mounting "things" (David Saylor)
3. 07:52 AM - Re: Transpondertest (Kelly McMullen)
4. 02:49 PM - Re: Transponder test (Rob Housman)
5. 05:40 PM - Alternator Shunt (BobbyPaulk@comcast.net)
6. 09:10 PM - Re: Alternator Shunt (highwire)
Message 1
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| Subject: | Re: Transpondertest |
=0AFolks,=0A =0ASometimes the transponder test finds failures in the pneuma
tic tubing or in the antenna. It's not a bad safety investment, since we al
l share the sky, IMHO.=0A =0A -- Art Z.=0A =0A--[ http://CheerfulCurmudg
eon.com/ ]( http://CheerfulCurmudgeon.com/ )"If I am not for myself, who is
for me? And if I am only for myself, what am I? And if not now, when?" Hil
lel=0A
Message 2
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| Subject: | Mounting "things" |
I agree, the MMC solution is quick and easy.
FWIW, a few more details: I was able to find some Hysol in cartridges that
looked and smelled like the stuff that comes with clickbonds called
Hysol/Loctite 8000.
Also, I recall bending the edge of the washer slightly in 3-4 places with
some duckbills. Picture attached.
That prevents squeeze-out of the glue under the washer's flange, and allows
for a little cavity between the washer and the screw.
Of course the customer is always right, so they must have had some pretty
good glue (insulation?) to justify metal locknuts so close to the adhesive
;-)
--Dave
Message 3
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| Subject: | Re: Transpondertest |
Just to be clear....what is tested depends on what the aircraft has
installed, and its desired use.
There are aircraft that have transponders without an altitude
encoder...only the transponder signal output is tested. There are VFR
only aircraft with transponder and encoder, where the transponder with
Mode C output is looked at to match altimeter at field elevation and
maybe one more altitude. There are IFR aircraft with transponder and
encoder that need certification of the altimeter, encoder and static
system at 500 ft intervals up to max certified altitude.
To show that they are related but separate...if a transponder is removed
for repair/alignment or to just clean the contacts, only a ramp check of
the transponder output is needed.
If an IFR aircraft needs the static system opened, to replace something,
repair a line, etc. the A&P doing the work can do a simple leak
check...no repeat of full static system is required.
Two most common failures I have seen are static system plumbing leaks
(including instrument housing leaks), and coax to the antenna failure.
Antennas rarely fail for anything other than physical damage.
On 5/22/2015 4:53 AM, Art Zemon wrote:
>
> Folks,
>
> Sometimes the transponder test finds failures in the pneumatic tubing
> or in the antenna. It's not a bad safety investment, since we all
> share the sky, IMHO.
>
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/
>
> /"If I am not for myself, who is for me? And if I am only for myself,
> what am I? And if not now, when?" Hillel/
>
> *
>
>
> *
Message 4
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| Subject: | Transponder test |
All the replies I have seen so far have assumed that your aircraft is registered
in the US. If not, then The FAA regs do not apply.
Best regards,
Rob Housman
Irvine, CA
Europa XS
A070
Airframe complete
Working on aviaonics
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Werner Schneider
Sent: Thursday, May 21, 2015 4:29 AM
Subject: AeroElectric-List: Transpondertest
--> <glastar@gmx.net>
Good morning folks,
I need some help in FAA regulations (being a Swiss).
FAR 43 Appendix F describes some transponder testing in order to be compliant with
FAR 91.413, which in itself redirects to 91.215a and
121.345 as well as 135.143 and there more redirections come into play.
Can someone explain me, if for a VFR only aircraft in the US with Transponder equipped
you need to perform a regular system check to be compliant with the FAR's
according to FAR 43 APP F?
Many thanks for your input on that.
Cheers Werner
Message 5
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| Subject: | Alternator Shunt |
I have added a 40 amp alternator to my airplane / engine and would like to reverse
the flow thru the shunt since it is bolted in place and would be inconvenient
to relocate.
I am fairly sure it just has a built in resistor for measuring the drop across
it so it should be O.K. I have changed the high side of the amp meter read out
to the new inlet.
Am I safe to ass u me this is o.k.?
Bobby
Jabiru 3300
Message 6
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| Subject: | Re: Alternator Shunt |
Sure. A standard ammeter shunt is a special resistor that drops 50 milli-volts
at rated current. So, you've got the idea, swap the current terminals, swap the
voltage terminals then. You're back in business.
ron
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442479#442479
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