Owner replacement of Nav/Comm Radios

[endre]

I am reading the FARs and am having a hard time figure out whether I
can slide out my old radios and have them upgraded and put them back
in. Slide in and out only no wiring or changing the shelf itself. Or
do I need A&P inspection?

[C Kingsbury]

(endre) wrote in message >...
> I am reading the FARs and am having a hard time figure out whether I
> can slide out my old radios and have them upgraded and put them back
> in. Slide in and out only no wiring or changing the shelf itself. Or
> do I need A&P inspection?

Weight & Balance is your main issue. AFAICT you're A-OK if you're
replacing like with like, but if you're making real changes that would
affect CoG, you at least need to get a new W&B signed off.

-cwk.

[endre]

Thanks. Same basic radio. Had a Narco 12D upgraded by narco to 12D+.
Same weight same location.


(C Kingsbury) wrote in message >...
> (endre) wrote in message >...
> > I am reading the FARs and am having a hard time figure out whether I
> > can slide out my old radios and have them upgraded and put them back
> > in. Slide in and out only no wiring or changing the shelf itself. Or
> > do I need A&P inspection?
>
> Weight & Balance is your main issue. AFAICT you're A-OK if you're
> replacing like with like, but if you're making real changes that would
> affect CoG, you at least need to get a new W&B signed off.
>
> -cwk.

[Ross Richardson]

How did you like the process and the radio. I am troubleshooting a Mk12D
problem now where the radio does not modulate, but has a carrier. It
finally works, after it warms up?. It never failed on the shop bench,
even with spray cooling and placing it in a refrigerator. I am going to
swap the two Narco Mk12Ds and see if the problem follow the radio or is
somewhere else.

endre wrote:
>
> Thanks. Same basic radio. Had a Narco 12D upgraded by narco to 12D+.
> Same weight same location.
>
> (C Kingsbury) wrote in message >...
> > (endre) wrote in message >...
> > > I am reading the FARs and am having a hard time figure out whether I
> > > can slide out my old radios and have them upgraded and put them back
> > > in. Slide in and out only no wiring or changing the shelf itself. Or
> > > do I need A&P inspection?
> >
> > Weight & Balance is your main issue. AFAICT you're A-OK if you're
> > replacing like with like, but if you're making real changes that would
> > affect CoG, you at least need to get a new W&B signed off.
> >
> > -cwk.

[Paul Sengupta]

"Ross Richardson" > wrote in message
...
> How did you like the process and the radio. I am troubleshooting a Mk12D
> problem now where the radio does not modulate, but has a carrier. It
> finally works, after it warms up?. It never failed on the shop bench,
> even with spray cooling and placing it in a refrigerator. I am going to
> swap the two Narco Mk12Ds and see if the problem follow the radio or is
> somewhere else.

Microphone wiring? Tray?

Paul

[Bill Hale]

(endre) wrote in message >...
> Thanks. Same basic radio. Had a Narco 12D upgraded by narco to 12D+.
> Same weight same location.
>
>
> (C Kingsbury) wrote in message >...
> > (endre) wrote in message >...
> > > I am reading the FARs and am having a hard time figure out whether I
> > > can slide out my old radios and have them upgraded and put them back
> > > in. Slide in and out only no wiring or changing the shelf itself. Or
> > > do I need A&P inspection?
> >
> > Weight & Balance is your main issue. AFAICT you're A-OK if you're
> > replacing like with like, but if you're making real changes that would
> > affect CoG, you at least need to get a new W&B signed off.
> >
> > -cwk.

What you should do... slide it in and be happy. You are far overestimating
the ability of anyone to figure out that it doesn't quite belong. There is
negligible wt & balance change. It's not unsafe.

BH

[C Kingsbury]

(Bill Hale) wrote in message

> What you should do... slide it in and be happy. You are far overestimating
> the ability of anyone to figure out that it doesn't quite belong. There is
> negligible wt & balance change. It's not unsafe.

True enough. Odds are if you're doing something so invasive that it
could change the W&B meaningfully you're having a real avionics shop
do a full panel overhaul.

I've been learning slowly that a significant part of ownership is
learning the difference between what is technically the way things get
done according to the book, and the way they actually get done on the
planet known as "reality."

Best,
-cwk.

[endre]

Thanks for the sage advice... Will slide in and be happy.

On the question of how I like it, I am not sure but will come back and
report. I was just having to many problems with the old one and then
it just died...

For 995 USD it seemed like a great deal to get new solid state modern
radio...


(C Kingsbury) wrote in message >...
> (Bill Hale) wrote in message
>
> > What you should do... slide it in and be happy. You are far overestimating
> > the ability of anyone to figure out that it doesn't quite belong. There is
> > negligible wt & balance change. It's not unsafe.
>
> True enough. Odds are if you're doing something so invasive that it
> could change the W&B meaningfully you're having a real avionics shop
> do a full panel overhaul.
>
> I've been learning slowly that a significant part of ownership is
> learning the difference between what is technically the way things get
> done according to the book, and the way they actually get done on the
> planet known as "reality."
>
> Best,
> -cwk.

[Paul Sengupta]

"endre" > wrote in message
om...
> For 995 USD it seemed like a great deal to get new solid state modern
> radio...

Anyone know if there's a modern slide in replacement for a Bendix RT-241B?

Paul