What caused the VSI and ALT bouce in the IMC?

I had an alt static valve installed on my plane by an avionics shop when they had it in
for the IFR static/transponder test. They considered it a minor mod, no 337 needed,
just a log entry. Total incremental cost was less than $100.

wrote:

Michael wrote:
: If you own an experimental, what you say is correct.

True... for a certified aircraft, the little $2.99 valve costs $299, and the
paperwork to install it costs another $300. Yet another instance of "what's safe is
not necessarily legal, and what's legal isn't necessarily safe."

-Cory

--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
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--
--Ray Andraka, P.E.
President, the Andraka Consulting Group, Inc.
401/884-7930 Fax 401/884-7950
email
http://www.andraka.com

"They that give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-Benjamin Franklin, 1759

While I don't doubt you did this, the avionics shop is in error. As mentioned
before, *any* alteration to the static system is considered a major alteration and
thus requires a field approval and 337. That's not to say it isn't tempting to put a
valve in where the encoder goes, just to say that it's not legal.

Similar to the thought that installing a NAV/COM is a logbook entry. From
what I understand, many people (A&P/IA types included) believe that's all that's
necessary, but many FSDOs consider it an alteration requiring a field-approval.

Of course, I consider it all a bunch of B.S. I'd prefer to learn and live by
the rules of Physics (which cannot be bent), rather than the rules of Man (which are
often arbitrary and capricious).

-Cory

Ray Andraka wrote:
: I had an alt static valve installed on my plane by an avionics shop when they had it in
: for the IFR static/transponder test. They considered it a minor mod, no 337 needed,
: just a log entry. Total incremental cost was less than $100.

: wrote:

: Michael wrote:
: : If you own an experimental, what you say is correct.
:
: True... for a certified aircraft, the little $2.99 valve costs $299, and the
: paperwork to install it costs another $300. Yet another instance of "what's safe is
: not necessarily legal, and what's legal isn't necessarily safe."
:
: -Cory
:
: --
: ************************************************** ***********************
: * The prime directive of Linux: *
: * - learn what you don't know, *
: * - teach what you do. *
: * (Just my 20 USm$) *
: ************************************************** ***********************

: --
: --Ray Andraka, P.E.
: President, the Andraka Consulting Group, Inc.
: 401/884-7930 Fax 401/884-7950
: email
: http://www.andraka.com

: "They that give up essential liberty to obtain a little
: temporary safety deserve neither liberty nor safety."
: -Benjamin Franklin, 1759



--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************