Today's Message Index:
----------------------
1. 08:10 AM - Re: Magneto Switch (Darrel Jones)
2. 08:16 AM - Ni-Cd Battery Safety Information Bulletin (Sebastien)
3. 08:43 AM - Re: Ni-Cd Battery Safety Information Bulletin (Charlie England)
4. 03:49 PM - Re: Ni-Cd Battery Safety Information Bulletin (Stuart Hutchison)
5. 04:34 PM - Re: [SUSPECTED SPAM] Re: Ni-Cd Battery Safety Information Bulletin (Kelly McMullen)
6. 05:37 PM - Re: Ni-Cd Battery Safety Information Bulletin (Robert L. Nuckolls, III)
7. 06:00 PM - Re: Re: Engine compartment fuse? (C&K)
Message 1
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| Subject: | Re: Magneto Switch |
I'll show this to Mom and have her talk to you.
On 11/3/2020 7:15 PM, Paul Millner wrote:
>
>> Normally a rotary Off, Left, Right, Both switch also has a Start
>> position, which momentarily grounds the Right magneto as long as the
>> switch is in the Start position
>
>
> The shorting function is selectable by jumper... on start, you can
> ground the right, the left, none, or if you're perverse, both... by
> changing jumpers.
>
> Paul
>
> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.matronics.com%2fNavigator%3fAeroElectric-List&c=E,1,JtnfvwqEtdpZ7cT_dRhpkBWtUDeta9aacn26At-yVi1E_vMaX3XQAH3FM0YXSG7DDnBUHm6HvKVpKksHcOLNhJ569m-4MzsmDvh785ne&typo=1
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Message 2
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| Subject: | Ni-Cd Battery Safety Information Bulletin |
Interesting, I have never heard of this.
*Aircraft Maintenance Manual Aircraft Parking Procedures usually require
the physical disconnection of the aircraft batteries, and the periodic
reconnection to carry out the parking or storage checks. A Type Certificate
(TC) holder in conjunction with a battery manufacturer has identified that
when a Nickel-Cadmium (Ni-Cd) battery is disconnected from the aircraft
loads, it self-discharges due to an electrochemical phenomenon, thus
inducing a reduction of battery capacity. When the battery is charged again
from the aircraft, the battery does not recover 100% of its initial
capacity. Therefore, after each cycle of battery self-discharge, the
available battery capacity will decrease progressively.*
Message 3
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| Subject: | Re: Ni-Cd Battery Safety Information Bulletin |
On 11/4/2020 10:11 AM, Sebastien wrote:
> Interesting, I have never heard of this.
>
> /Aircraft Maintenance Manual Aircraft Parking Procedures usually
> require the physical disconnection of the aircraft batteries, and the
> periodic reconnection to carry out the parking or storage checks. A
> Type Certificate (TC) holder in conjunction with a battery
> manufacturer has identified that when a Nickel-Cadmium (Ni-Cd) battery
> is disconnected from the aircraft loads, it self-discharges due to an
> electrochemical phenomenon, thus inducing a reduction of battery
> capacity. When the battery is charged again from the aircraft, the
> battery does not recover 100% of its initial capacity. Therefore,
> after each cycle of battery self-discharge, the available battery
> capacity will decrease progressively./
Interesting, but isn't it more of academic than practical interest, for
most of us? I doubt that you could find a NiCd starting battery in a
homebuilt these days.
Charlie
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Message 4
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| Subject: | Re: Ni-Cd Battery Safety Information Bulletin |
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Message 5
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| Subject: | Re: Ni-Cd Battery Safety Information |
Bulletin
Well, those of us that had ni-cad powered drills and ni-cad powered
laptops got the joy of replacing the batteries when the recharge
capacity dropped down to 30%. At least lithium batteries suffer much
less of this effect.
On 11/4/2020 9:38 AM, Charlie England wrote:
> On 11/4/2020 10:11 AM, Sebastien wrote:
>> Interesting, I have never heard of this.
>>
>> /Aircraft Maintenance Manual Aircraft Parking Procedures usually
>> require the physical disconnection of the aircraft batteries, and the
>> periodic reconnection to carry out the parking or storage checks. A
>> Type Certificate (TC) holder in conjunction with a battery
>> manufacturer has identified that when a Nickel-Cadmium (Ni-Cd) battery
>> is disconnected from the aircraft loads, it self-discharges due to an
>> electrochemical phenomenon, thus inducing a reduction of battery
>> capacity. When the battery is charged again from the aircraft, the
>> battery does not recover 100% of its initial capacity. Therefore,
>> after each cycle of battery self-discharge, the available battery
>> capacity will decrease progressively./
> Interesting, but isn't it more of academic than practical interest, for
> most of us? I doubt that you could find a NiCd starting battery in a
> homebuilt these days.
>
> Charlie
>
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Message 6
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| Subject: | Re: Ni-Cd Battery Safety Information Bulletin |
At 10:38 AM 11/4/2020, you wrote:
>On 11/4/2020 10:11 AM, Sebastien wrote:
>>Interesting, I have never heard of this.
>>
>>Aircraft Maintenance Manual Aircraft Parking Procedures usually
>>require the physical disconnection of the aircraft batteries, and
>>the periodic reconnection to carry out the parking or storage
>>checks. A Type Certificate (TC) holder in conjunction with a
>>battery manufacturer has identified that when a Nickel-Cadmium
>>(Ni-Cd) battery is disconnected from the aircraft loads, it
>>self-discharges due to an electrochemical phenomenon, thus inducing
>>a reduction of battery capacity. When the battery is charged again
>>from the aircraft, the battery does not recover 100% of its initial
>>capacity. Therefore, after each cycle of battery self-discharge,
>>the available battery capacity will decrease progressively.
>
>Interesting, but isn't it more of academic than practical interest,
>for most of us? I doubt that you could find a NiCd starting battery
>in a homebuilt these days.
Agreed. In fact, I thought the Ni-Cads were outlawed
in Europe for new/replacement back about 2010. I'm assuming
also that this document is talking about wet cranking
batteries . . . a very unlikely candidate for an
amateur built application.
Even so, the admonition seems a bit of overkill.
The operator of an aircraft stored for prolonged
periods without active battery maintenance is
well advised if not obligated to cap check the
battery (amongst other things) before putting
the a/c back in service.
According to this article:
https://tinyurl.com/ycukwcmb
"Nickel-cadmium stores well. The US Air Force was able to deploy
NiCd batteries
that had been in storage for 5 years with good recovered capacities after
priming. It is believed that priming becomes necessary if the
voltage drops below 1V/cell."
"Priming" is a specialized charging protocol for
NiCads that often brings a long-stored NiCad
back to serviceable condition. This would be
the consistent with the bulletin's reference to
a competent battery maintenance shop.
In any case, a veteran user of Ni-Cads already
understands this. This bulletin seems kinda
redundant . . . sorta like reminding you to
tie your shoes.
Bob . . .
Message 7
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| Subject: | Re: Engine compartment fuse? |
Joe and Ron thanks for your thoughts
It is the 912i with the large rotax supplied fuse box. (The rotax
supplied fuse box with voltage regulators that rotax says must be
located in the engine compartment due to fire risk but must be kept
below 80 Celsius). From an inspectors point of view an an
automotive/marine fuse block is probably not quite as acceptable as a
rotax supplied fuse box but it may be an option. A 10awg wire feed from
the battery contactor hardly seems like a classic "fat wire" that
doesn't need current protection but I could upsize it and that may be
the easiest solution. It would mean a total of three 30 amp fused wires
passing back through the firewall to the rotax voltage regulator/fuse
box in the engine compartment.
In the past I've used a maxi fuse holder on the cold side of the FW. I
did not know about the midi fuses. Most fuse holders seem to be good
for only about 85*C. but that also seems true for the rotax supplied box.
Ken
On 02/11/2020 4:09 PM, rparigoris wrote:
>
> Hi Ken FWIW I just installed a 30 amp MIDI fuse on my Rotax 914. I punched out
the hole of the MIDI to 1/4"and mounted one side to my shunt and the other side
to a 1/4-28 Brass stud so a holder was not needed. McMaster and B&C sells
MIDI holders. Note that MIDI and Maxi fuses are not as fast acting as ATC and
MINI. Maxi fuese are large ATC like fuses. McMaster sells the inline fast on style
holder as well as a more robust clamp style holder. I was on the fence between
MIDI and Maxi. Ron P.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=499206#499206
>
>
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