Today's Message Index:
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1. 11:49 AM - Is it time to sell the mechanical indicators? (CardinalNSB@aol.com)
2. 06:55 PM - Questions on avionics ()
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| Subject: | Is it time to sell the mechanical indicators? |
With all the new electronic cdi etc.
Will the mechanical cdi/gs indicators be museum pieces in the near future?
Should I sell my not yet installed indicators before the price falls?
Or will there be a market for say a King 206 for a long time?
Or will the mechanical cdi's survive the sunspot and emf storms better than
the glass displays?
Skip
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Message 2
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| Subject: | Questions on avionics |
4/17/2008
Hello Ira,
1) You wrote: "There is no requirement for TSO in owner built aircraft."**
2) FAR SEC 91.217 Says:
"Data correspondence between automatically reported pressure
altitude data and the pilot's altitude reference.
No person may operate any automatic pressure altitude reporting equipment
associated with a radar beacon transponder-
(a) When deactivation of that equipment is directed by ATC;
(b) Unless, as installed, that equipment was tested and calibrated to
transmit altitude data corresponding within 125 feet (on a 95 percent
probability basis) of the indicated or calibrated datum of the altimeter
normally used to maintain flight altitude, with that altimeter referenced to
29.92 inches of mercury for altitudes from sea level to the maximum
operating altitude of the aircraft; or
(c) Unless the altimeters and digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, respectively."
3) Please explain, with specific valid reference, why the phrase "No person
may ..." seen above would not apply to a person flying an amateur built
experimental aircraft.
4) You are correct that there are alternatives to using TSO'd equipment,
when such equipment is specifically required by a regulation, provided that
you can prove to the FAA's satisfaction that your alternative equipment is
acceptable to the FAA. Here is how you go about doing that:
FAR Sec. 21.609 "Approval for deviation.
(a) Each manufacturer who requests approval to deviate from any performance
standard of a TSO shall show that the standards from which a deviation is
requested are compensated for by factors or design features providing an
equivalent level of safety.
(b) The request for approval to deviate, together with all pertinent data,
must be submitted to the Manager of the Aircraft Certification Office for
the geographic area in which the manufacturer is located. If the article is
manufactured in another country, the request for approval to deviate,
together with all pertinent data, must be submitted through the civil
aviation authority in that country to the FAA."
Obtaining an approval for deviation is not a trivial task and none of the
manufacturers of non TSO'd altitude encoders contained in their EFIS units
have done so to my knowledge.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
**PS: This statement is also not correct when it comes to the ELT installed,
if one is required by FAR Sec 91.207, in an amateur built experimental
aircraft.
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Time: 04:30:41 AM PST US
Subject: Re: Questions on avionics
From: "rampil" <ira.rampil@gmail.com>
Re: TSO and altimetry sources
There is no requirement for TSO in owner built aircraft. As I said
previously, there is only a performance requirement.
Part 23 is a separate issue.
--------
Ira N224XS
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