---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Thu 04/17/08: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:49 AM - Is it time to sell the mechanical indicators? (CardinalNSB@aol.com) 2. 06:55 PM - Questions on avionics () ________________________________ Message 1 _____________________________________ Time: 11:49:26 AM PST US From: CardinalNSB@aol.com Subject: Avionics-List: 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 **************Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. (http://autos.aol.com/used?NCID=aolcmp00300000002851) ________________________________ Message 2 _____________________________________ Time: 06:55:09 PM PST US From: Subject: Avionics-List: 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. ----------------------------------------------------------------- Time: 04:30:41 AM PST US Subject: Re: Questions on avionics From: "rampil" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message avionics-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Avionics-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/avionics-list Browse Digests http://www.matronics.com/digest/avionics-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.