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Reply-To: Sky2high@aol.com
Reply-To: lancair.list@olsusa.com
From: "Scott Krueger" <sky2high@hotmail.com>
To: lancair.list@olsusa.com
Cc: Sky2high@aol.com
Subject: More IFR GPS questions
Date: Sun, 11 Mar 2001 07:38:23 -0600
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Adam,

You wrote:

<AC20-130 and  -138 seem to apply to add-on installation into an existing
airplane. Is the approval procedure simpler if all the avionics are in place 
at the time the initial airworthiness is awarded?>

Did you read the AIM 1-1-21?  GPS is DIFFERENT and, as a responder to Mike 
Busch's AVweb article about using the 530 said, "...for the first time the 
FAA has chosen to micro-manage all aspects of GPS..."  Remember that Garmin 
nicely provided the 195 with vertical guidance on the HSI page (VNAV).  The 
FAA doesn't allow that on a "panel mount" and also stops the VNAV function 
from operating as soon as you are on an approach.  You know, just when you 
need it.

The question you raised should be directed to your local FSDO -- they are 
the ones that do the final sign off. Perhaps you could contact an FAA 
inspector or DAR.  We would all be interested in the result.

I wired my 320 panel, including an S-Tec 50, Garmin 155 IFR approach GPS, 
annunicator/switches (50 pin cable), King 209? CDI, King 75 resolver, etc.  
The Garmin 155 was a follow-on installation (replacing a LORAN unit) in 
1997, a year after the plane was certified.  I signed it off.  I don't know 
if it was "legal", but I think the rules changed somewhere along the line.

The Garmin x30 is a complex unit and can receive and send a wide variety of 
aviation data.  It can take in and use air data and fuel data.  It can send 
ARINC 429 data for steering autopilots and informing HSI displays and maps.  
Go to your local avionics shop and look in the install manual at the 
pin-outs for the 530.  This may influence your choice of other navigation 
support equipment.  It may also help understanding why the FAA wants an 
authorized shop to do the install and why they (the FAA) want to sign it 
off.

Scott Krueger
LNC2 - N92EX
Lagacy Kit #2

Support WAAS for your VNAV solution!


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