Today's Message Index:
----------------------
1. 09:59 AM - Re: Which Oil Pressure Switch? (Robert L. Nuckolls, III)
2. 10:10 AM - Re: Wiring Looms (Robert L. Nuckolls, III)
3. 10:28 AM - Re: Wiring Looms (Robert L. Nuckolls, III)
4. 04:54 PM - Re: Which Oil Pressure Switch? (Mudfly)
5. 06:27 PM - Re: Re: Which Oil Pressure Switch? (A RICHARD GOLDMAN)
Message 1
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| Subject: | Re: Which Oil Pressure Switch? |
[quote="nuckolls.bob(at)aeroelect"]At 07:56 AM 4/21/2023, you wrote:
Shawn,
Could you set this hourmeter up on the bench
and measure the current draw on the enable
pin in the pull-up configuration? I think
I have a simple solution using p-lead
signal from a mag to drive the enable pin
but having that current value would facilitate
optimization of the components.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 2
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| Subject: | Re: Wiring Looms |
At 05:48 AM 4/25/2023, you wrote:
><goldsteinindustrial@gmail.com>
>
>Have over 40yrs experience in automotive and now swapped to
>aviation; what an absolute joy!!
>
>Regarding wiring looms.. what spec wire are people using in aircraft
>looms, and what is being used as the outer protective sheathing? Is
>it a specific shrink wrap fire retardant material?
>
>Thanks in advance.
Designers of TC aircraft go out of their
way to avoid a necessity for mechanically
shielding wire bundles. When external
covers are found on the drawings, there's
a special risk for mechanical damage to
the bundle . . . wheel wells, exposure to
foot traffic, etc.
There are lots of things in airplanes
that would suffer operational compromise
if they came into antagonistic contact
with foreign bodies. Bus bars, control cables . . .
and yeah, wire bundles.
First rule of thumb is to conduct the failure
modes effects analysis to identify risk and
then eliminate it. If not possible/practical,
then add 'shielding'. Shielding is rarely
found to be useful.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 3
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| Subject: | Re: Wiring Looms |
>Under the cowl you can use Mil Spec 22759/11, which has silver,
>rather than solder coating the copper strands. The insulation is
>Teflon, rather than Tefzel. This wire withstands higher heat [200 C]
>than 22759/16. The Teflon insulation is softer, so it can be bent
>into tighter radii. Many avionics shops will use the /11 wire behind
>the instrument panel, to allow tighter loops in the harness. One
>caveat with the /11 wire, don't secure it to tightly or use Nylon
>wire ties, as this can saw through the soft Teflon insulation over
>time. FYI, I have found it easier to get the /11 wire in colors.
Teflon over silver plated wire is not
recommended for general airframe wiring
or appliance fabrication. I don't think
our wire bundle shops even had Teflon
in inventory . . .
Had a conversation about Teflon with
with Greg Richter of BlueMountain fame
starting on page 38 of this document:
https://tinyurl.com/2tbearkn
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 4
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| Subject: | Re: Which Oil Pressure Switch? |
Will do Bob. I'll try and get that set up tomorrow and post what I find.
Thanks.
Shawn
Shawn,
Could you set this hourmeter up on the bench
and measure the current draw on the enable
pin in the pull-up configuration? I think
I have a simple solution using p-lead
signal from a mag to drive the enable pin
but having that current value would facilitate
optimization of the components.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.[/quote]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510710#510710
Message 5
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| Subject: | Re: Which Oil Pressure Switch? |
Whatever you choose for a transducer for any liquid pressure, make sure you install
a restrictor in line to prevent major fluid loss in case of physical sensor
leakage or breakage.
Sent from my iPhone
> On Apr 26, 2023, at 6:54 PM, Mudfly <shawntedwards@hotmail.com> wrote:
>
>
> Will do Bob. I'll try and get that set up tomorrow and post what I find.
> Thanks.
> Shawn
>
>
>
> Shawn,
>
> Could you set this hourmeter up on the bench
> and measure the current draw on the enable
> pin in the pull-up configuration? I think
> I have a simple solution using p-lead
> signal from a mag to drive the enable pin
> but having that current value would facilitate
> optimization of the components.
>
>
> Bob . . .
>
> ////
> (o o)
> ===========o00o=(_)=o00o=========
>
> < show me where I'm wrong. >
> ================================
>
> In the interest of creative evolution
> of the-best-we-know-how-to-do based
> on physics and good practice.[/quote]
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510710#510710
>
>
>
>
>
>
>
>
>
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