Today's Message Index:
----------------------
1. 03:31 AM - Re: CM-28 bulbs for Yaks (Rob Rowe)
2. 05:59 AM - M14P tacho generator (aerostar6)
3. 11:21 AM - Re: M14P tacho generator (Bitterlich, Mark G CIV NAVAIR, WD)
4. 11:24 AM - Re: Re: CM-28 bulbs for Yaks (Bitterlich, Mark G CIV NAVAIR, WD)
5. 12:09 PM - Re: M14P tacho generator (aerostar6)
6. 02:55 PM - unobtainum gottahavem (doug sapp)
Message 1
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| Subject: | Re: CM-28 bulbs for Yaks |
mark.bitterlich(at)navy.m wrote:
> To "Group",
>
> I've kind of lost track of this thread. I know lots of postings came out for
LED replacements for the CJ-6A, but did anyone ever come up with a source for
LED replacements for the YAK standard bulbs used in the landing gear warning
indicators? I know I saw it for the CJ, just not sure I saw it for the Yak model.
Sorry to ask for a repeat of this information, but it became hard to know
who was talking about exactly what and which. :-)
>
> --
Hi Mark,
I've been using Marl International type 253 replacement LEDs for the last 7 years.
They're a T2 BA7s fitting (Yak gear/flap indicators) and rated 8-48V AC/DC,
although not cheap (c.10USD each) especially for the 16 needed in a -52. At
least your -50 only needs 4!
http://ds.leds.co.uk/ds/253series.pdf
Experience as follows;
- white LEDs tend to wash out the dome lens colour, so use green/red/yellow LEDs
to improve colour rendition
- initially tried the "DC" version (type 213, no longer available) but had a couple
of failures after a few years, whereas the rectified (AC/DC) version (type
253) have never failed. Not too surprising given Yak bus negative transients
are not LED friendly without rectifier protection.
- LED sits well forward in Yak bulb holder and needs c. 0.5mm chamfer (scalpel
works well) on plastic leading edge to ease it past the collar found in the lens
cap assembly.
Also good to be aware of following UK CAA advisory letter (2006) on cleaning lamp
holders ...
http://www.caa.co.uk/docs/1594/LTO2918.pdf
CAA reference to "Corrosion inhibitor" (sic) in this case probably means residual
air/oil/carbon particles from air compressor rather than the alcohol/glycerin
used for maintenance (albeit it was never intended for that purpose, but that's
another story!).
FWIW - interested if your experience is similar to mine in that it's mainly the
bulbs in the vicinity of the cockpit gear vent that fail. IMHO due to contamination
from air system gunk, as lots of carbon particles in this from compressor
pump lubrication carbonising on the hot outlet valve. Having examined many
bulbs I've never found one with a broken filament (suggesting shock/vibration
failure) they've all been blackened by the filament burning out. Believe this
is caused by the bulb holders heating up (as per CAA advisory) through carbon
particle contamination, in turn the metal part of the bulb then heats up and
expands. Cycle this lots of times and eventually the metal/glass bond fails and
the inert gas seeps, with the filament burning out as a consequence. So keeping
the bulb holders clean might also help reduce incandescent bulb failure,
as well as avoiding a cabin smoke/fire risk. Maybe this was a contributory factor
in Jill's hot bulb issue too?
As always YMMV!
Hope this helps, Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427195#427195
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| Subject: | M14P tacho generator |
Anyone have a green tagged tacho-generator unit for an M14P that they would be
willing to part with?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427200#427200
Message 3
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| Subject: | M14P tacho generator |
No, do not have one, but will say that a lot of folks think the tach generator
is bad when it is actually a fractured solder connection in the plug that attaches
to it.
You can actually remove the tach gen and connect it to a drill and operate it manually,
and check the voltage a lot easier with the engine running.
If you have already done this kind of stuff, sorry for bringing it up.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of aerostar6
Sent: Wednesday, July 23, 2014 8:59 AM
Subject: Yak-List: M14P tacho generator
Anyone have a green tagged tacho-generator unit for an M14P that they would be
willing to part with?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427200#427200
Message 4
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| Subject: | Re: CM-28 bulbs for Yaks |
THANKS ROB! GOOD INFO AS ALWAYS!
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Rob Rowe
Sent: Wednesday, July 23, 2014 6:29 AM
Subject: Yak-List: Re: CM-28 bulbs for Yaks
mark.bitterlich(at)navy.m wrote:
> To "Group",
>
> I've kind of lost track of this thread. I know lots of postings came out for
LED replacements for the CJ-6A, but did anyone ever come up with a source for
LED replacements for the YAK standard bulbs used in the landing gear warning
indicators? I know I saw it for the CJ, just not sure I saw it for the Yak model.
Sorry to ask for a repeat of this information, but it became hard to know
who was talking about exactly what and which. :-)
>
> --
Hi Mark,
I've been using Marl International type 253 replacement LEDs for the last 7 years.
They're a T2 BA7s fitting (Yak gear/flap indicators) and rated 8-48V AC/DC,
although not cheap (c.10USD each) especially for the 16 needed in a -52. At
least your -50 only needs 4!
http://ds.leds.co.uk/ds/253series.pdf
Experience as follows;
- white LEDs tend to wash out the dome lens colour, so use green/red/yellow LEDs
to improve colour rendition
- initially tried the "DC" version (type 213, no longer available) but had a couple
of failures after a few years, whereas the rectified (AC/DC) version (type
253) have never failed. Not too surprising given Yak bus negative transients
are not LED friendly without rectifier protection.
- LED sits well forward in Yak bulb holder and needs c. 0.5mm chamfer (scalpel
works well) on plastic leading edge to ease it past the collar found in the lens
cap assembly.
Also good to be aware of following UK CAA advisory letter (2006) on cleaning lamp
holders ...
http://www.caa.co.uk/docs/1594/LTO2918.pdf
CAA reference to "Corrosion inhibitor" (sic) in this case probably means residual
air/oil/carbon particles from air compressor rather than the alcohol/glycerin
used for maintenance (albeit it was never intended for that purpose, but that's
another story!).
FWIW - interested if your experience is similar to mine in that it's mainly the
bulbs in the vicinity of the cockpit gear vent that fail. IMHO due to contamination
from air system gunk, as lots of carbon particles in this from compressor
pump lubrication carbonising on the hot outlet valve. Having examined many
bulbs I've never found one with a broken filament (suggesting shock/vibration
failure) they've all been blackened by the filament burning out. Believe this
is caused by the bulb holders heating up (as per CAA advisory) through carbon
particle contamination, in turn the metal part of the bulb then heats up and
expands. Cycle this lots of times and eventually the metal/glass bond fails and
the inert gas seeps, with the filament burning out as a consequence. So keeping
the bulb holders clean might also help reduce incandescent bulb failure,
as well as avoiding a cabin smoke/fire risk. Maybe this was a contributory factor
in Jill's hot bulb issue too?
As always YMMV!
Hope this helps, Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427195#427195
Message 5
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| Subject: | Re: M14P tacho generator |
Thanks Mark, Yes, have already rebuilt the connections inside the canon plug that
fits onto the tacho-gen: still getting the rpm falling off line when the engine
heats up, so the T-G is the next port of call, although your suggestion of
running it from a drill might be worth trying when we get it off.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427223#427223
Message 6
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| Subject: | unobtainum gottahavem |
Just received a small shipment which contained 2 sets of new mag points.
$200.00 each. Contact me off list.
Doug
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