X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 14 Nov 2005 07:16:57 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.0.1) with ESMTP id 829854 for lml@lancaironline.net; Mon, 14 Nov 2005 00:47:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m27.mx.aol.com (mail_out_v38_r6.3.) id q.1c1.359886ec (17377) for ; Mon, 14 Nov 2005 00:46:22 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <1c1.359886ec.30a97ead@aol.com> X-Original-Date: Mon, 14 Nov 2005 00:46:21 EST Subject: Re: [LML] Re: Navigating in the IFR system in an experimental aircraft X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1131947181" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1131947181 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Ron, Yes, now that I think about it, either the AOPA or EAA got the FAA to accept the fact that a simple enroute/terminal/approach GPS installation was no different than any other simple avionic system. To Wit: AC-20-138A (canceling AC-20-138), 12/03, Airworthiness Approval of ...GNSS Equipment. .......... .....8- Approval Process .....c. Installation of GNSS Equipment .....1. Evaluation of Installation .....iii. Minor Alteration .....(B) ........GNSS equipment that only interfaces with an antenna, power, ground, an external HSI/CDI with a single source selector switch, and a left/right (deviation-based) autopilot would typically be considered a minor alteration. ........ "Minor Alteration" is a powerful term in FAA land where all IFR GPS installs used to be considered a Major Alteration. <<>> Note. 1. No STCs for Experimental Aircraft. 2. TSO'd stuff loses its TSOedness after installation in an experimental aircraft. Theoretically, stuff taken out of an experimental aircraft for installation on a commercially built STC'd aircraft must be re-TSO'd. 3. Even though S-TEC GPSS provides ARINC ground track guidance via replacing Turn Coordinator "deviation" data, it is still a minor alteration thus escaping FSDO scrutiny. This AC and Transport Canada Policy Letter 553-003 does a good job justifying the simple approach to the simplification of a simple installation. See: _http://www.tc.gc.ca/CivilAviation/certification/guidance/551/551-003.htm_ (http://www.tc.gc.ca/CivilAviation/certification/guidance/551/551-003.htm) It still would be interesting to hear from an avionics shop that builds Lancair panels.......... Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1131947181 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Ron,

Yes, now that I think about it, either the AOPA or EAA got the FA= A to=20 accept the fact that a simple enroute/terminal/approach GPS installatio= n=20 was no different than any other simple avionic system.

To Wit:

AC-20-138A (canceling AC-20-138), 12/03, Airworthiness Approval of= =20 ...GNSS Equipment.

..........

.....8- Approval Process

.....c. Installation of GNSS Equipment

.....1. Evaluation of Installation

.....iii. Minor Alteration

.....(B) ........GNSS equipment that only interfaces with an antenna,=20 power, ground, an external HSI/CDI with a single source selector switch, and= a=20 left/right (deviation-based) autopilot would typically be considered a minor= =20 alteration.

........

"Minor Alteration" is a powerful term in FAA land where all IFR GPS=20 installs used to be considered a Major Alteration.

<<<Obtained by Google search "AC-20-138A">>>

Note.

1. No STCs for Experimental Aircraft.

2. TSO'd stuff loses its TSOedness after installation in an experimenta= l=20 aircraft. Theoretically, stuff taken out of an experimental aircraft f= or=20 installation on a commercially built STC'd aircraft must be re-TSO'd.

3. Even though S-TEC GPSS provides ARINC ground track guidance via=20 replacing Turn Coordinator "deviation" data, it is still a minor alteration=20= thus=20 escaping FSDO scrutiny.

This AC and Transport Canada Policy Letter 553-003 does a good job=20 justifying the simple approach to the simplification of a simple=20 installation. See:

http://www.tc.gc.ca/CivilAviation/certification/guidance/551/551-003.h= tm

It still would be interesting to hear from an avionics shop that builds= =20 Lancair panels..........

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

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