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advice in this forum.]----
Lynn.
Another view of the TSO puzzle from Bill Biggs. See below
John Roach
N 2427H
RE: [COUPERS-TECH] Answers Re: TSO/Non-TSO
WILLIAM BIGGS
Fri, 12 Jan 2007 06:08:23 -0800
"5) You may not even need a 337. Those forms address the installation
process, NOT the radio itself, and are only needed at all IF the
installation involves a "major structural change." Putting the radio
into an existing hole, or hanging it beneath the panel does NOT need a
337. Similarly, if you're putting a new antenna into an existing
antenna mount location, its not a "major structural change," therefore
no 337 needed. "
Not true. Example: If you change from your cessna radio to a Michael. It
goes in exactly the same location but we all know they require a 337.
Hanging an additional radio beneath the panel constitutes a change in
weight and ballance however small and must be recorded.
337s now require a provision for "continued airworthiness." Anything
that is not in the airframe or engine specifications that is added or
changed constitutes a major alteration unless specifically excluded in
part 43.1.
The following is considered preventative maint and is allowed but only
of the EXACT type:
(31) Removing and replacing self-contained, front instrument
panel-mounted navigation and communication devices that employ
tray-mounted connectors that connect the unit when the unit is installed
into the instrument panel, (excluding automatic flight control systems,
transponders, and microwave frequency distance measuring equipment
(DME)). The approved unit must be
designed to be readily and repeatedly removed and replaced, and
pertinent instructions must be provided. Prior to the unit's intended
use, and operational check must be performed in accordance with the
applicable sections of part 91 of this chapter.
(32) Updating self-contained, front instrument panel-mounted Air Traffic
Control (ATC) navigational software data bases (excluding those of
automatic flight control systems, transponders, and microwave frequency
distance measuring equipment (DME)) provided no disassembly of the unit
is required and pertinent instructions are provided. Prior to the unit's
intended use, an operational check must be performed in accordance with
applicable sections of part 91 of this chapter.
Appendix A
Sec. A43.1
(a) /Major alterations/--
(1) /Airframe major alterations./ Alterations of the following parts and
alterations of the following types, _when not listed in the aircraft
specifications issued by the FAA_, are airframe major alterations:
Bill
[EMAIL PROTECTED] wrote:
----[Please read http://ercoupers.com/disclaimer.htm before following any
advice in this forum.]----
Hey Gang: Some time ago we had a discussion about TSO'd and non TSO'd
instrument requirements. As I remember, one of our group came up with
the FAA paragraph's that specifically spelled out the use of those
items. I saved the message, but unfortunately for me, my computer
bombed last fall, and I lost all of the saved messages before then.
I have reviewed most of last years Tech messages, and did not find
what I was looking for. Does anyone have the answer? I know there was
considerable discussion about radios. but I am specifically concerned
about instruments.
Lynn
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