----[Please read http://ercoupers.com/disclaimer.htm before following any
advice in this forum.]----
I think some of the confusion may be between the work that the aircraft
owner can do as preventative maintenance, the work that an AI can sign
off with a log book entry as a minor change, and the major work that
requires a 337 or FAA field approval. This is a seperate issue from the
TSO vs non TSO'd instruments.
My understanding is that work on a non structural panel, such as
installing radios, requires only a log book entry and recording of the
new weight and balance data by an AI.
Dan Brown
John Roach wrote:
----[Please read http://ercoupers.com/disclaimer.htm before following
any 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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