backup for vacuum pump/attitude indicator failure

Why not install a 4 inch Venturi on the side or the belly of the
aircraft ( 50 bucks aircraft spruce) then route to a selector valve
then you could switch between engine pump or venturi. This will drive
BOTH AI and the DG.

Or you could install the venturi to drive a back up CHEAP ( older type;
black face) Gyro Horiz. I am sure an instrument shop will sell you one
at a good price as every one wants a color faced type.

Now what about BACK UP electrical power thats CHEAP and portable!


I use one in my Airplane it provides 5 hours of FULL Avionics power !
It cost LESS than 30 bucks to make and all parts are from WAL - MART!


Hint: GARDEN TRACTOR

Hint, unless a homebuilt, all parts must be approved parts.


My vote for safety and redundancy would be for the Sporty's
AI [not as a replacement for T&B] and the 496 GPS. The 496
is aviation, marine and highway, it is your XM radio too.

Unlike the emergency attitude indicators used in jets, the
Sporty's AI does not have a separate battery for power.
You can have your shop create a redundant power source with
a small battery that will be charged from the bus, but
isolated if the alternator fails.



"wise purchaser" wrote in message
ps.com...
|
|
| Why not install a 4 inch Venturi on the side or the belly
of the
| aircraft ( 50 bucks aircraft spruce) then route to a
selector valve
| then you could switch between engine pump or venturi.
This will drive
| BOTH AI and the DG.
|
| Or you could install the venturi to drive a back up CHEAP
( older type;
| black face) Gyro Horiz. I am sure an instrument shop will
sell you one
| at a good price as every one wants a color faced type.
|
| Now what about BACK UP electrical power thats CHEAP and
portable!
|
|
| I use one in my Airplane it provides 5 hours of FULL
Avionics power !
| It cost LESS than 30 bucks to make and all parts are from
WAL - MART!
|
|
| Hint: GARDEN TRACTOR
|

Hint, unless a homebuilt, all parts must be approved parts.

Is this really true? I cannot mount an unapproved CD player someplace
so that it won't flop around in flight?

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.

yes


"Jose" wrote in message
m...
| Hint, unless a homebuilt, all parts must be approved
parts.
|
| Is this really true? I cannot mount an unapproved CD
player someplace
| so that it won't flop around in flight?
|
| Jose
| --
| "Never trust anything that can think for itself, if you
can't see where
| it keeps its brain." (chapter 10 of book 3 - Harry
Potter).
| for Email, make the obvious change in the address.

Thanks for all the helpful comments so far. In thinking about what you
all have said, with my current setup (and yes I am an owner), I would
realistically have a DG with either a vacuum pump failure or AI
failure. In the case of a vacuum pump failure, I could still get
current ground track from the 430. And, obviously with the AI failure
alone, I would still have the DG.

While I don't do a lot of flying in actual IMC, I do enough that I'm
willling to spend some extra money to hopefully prevent a major problem
in the event of vacuum pump failure. I don't know about the rest of
you, but if I encounter a situation where I end up flying partial
panel, I plan to get in VMC ASAP, or if I can't do that, land.

I haven't yet flown with any of the Garmin handhelds, but my guess (and
I could certainly be off on this) is that would be harder to use the
panel page on the handheld as a backup versus having a backup electric
AI and thus the traditional instrument panel gauges and layout that I
trained on. The electric AI from Sporty's also has the ball
inclinometer built into it and can replace the turn coordinator.

So, if anyone else wants to weigh in on best bang for the buck backup,
here again are the options in contention:

1. Engine driven backup vacuum (such as Precise Flight)
2. Electric AI
3. Garmin 396/496
4. $2 failed-instrument covers (I need these anyway, but I had to
throw this in as an option).

Thanks again.

Kelly

The 396/496 gives you XM-WX capability, which you can also add to your '430.
If you already have the weather capability in your '430, I'd opt for a
lower cost Garmin, like a 196, to provide backup GPS and, most critically, a
backup for the DG (by placing the 196 in the HSI mode). Either way, I'd
also add an electric backup AI

-Elliott Drucker

4. $2 failed-instrument covers (I need these anyway, but I had to
throw this in as an option).

5: MSFS and practice.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.

Is this really true? I cannot mount an unapproved CD
player someplace
so that it won't flop around in flight?
yes

Actually, I spoke to our FSDO not too lona ago with this very question,
and the answer came back that it is legal to do so. The =installation=
needs to be approved (the installer can self-approve) but the device
being installed need not be an approved device, so long as it is not
powered directly by the aircraft system (cigarette lighter power is ok).

They are concerned that the installation not interfere with flight
controls and such. They are concerned that a non-approved device not
take the place of an approved instrument, but according to my FSDO, once
I explaned all we wanted to do (install an electric backup AI), they
were ok with it.

YMMV

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.

Is this really true? I cannot mount an unapproved CD player someplace
so that it won't flop around in flight?

yes

Not true in the slightest. You want to velcro your CD player to the top
of the glareshield or maybe to the floor have at it. I have my
satellite radio attached to the far left side of the panel with that two
sided 3M sticky tape they give you with the radio. That stuff is better
than screws because when I want to remove it you'll never know it was
there and if you've worked with that tape before you know how solid it
is. I run the power, antenna and audio out cables under the glareshield
and then out to where they need to go.

On Sun, 19 Nov 2006 16:45:31 -0600, Jim Macklin wrote:

yes

See the current "Tech Topics" article in CPA Magazine. It's not quite as
clear-cut an answer as this.

- Andrew