Derek:
“the manufacturer of an avionics box derives a set of tests that are run in order to show the box is serviceable. Usually it is a complete set of tests, and, depending on technical justification and what has happened to the box, may be run in whole, or in part” OK, so this isn’t to sell the design to an airframe manufacturer, it’s actually a validation of proper servicing techniques after somebody works on the gadget? I would figure that commercial aviation would have service procedures that end up with a detailed acceptance test (when you R&R the elevator servo amplifiers, you do this and that and then, using Testbox Whoopee-717, you do XYZ to prove you did it all OK). So I’m not sure who you want to guide with your document. If your product is intended for the private aviation market, then I’m out of my area of experience (notice I didn’t say expertise). I understand that an aircraft owner can’t just replace parts on his aircraft; if he did, it would probably jeopardize his airworthiness certification. An owner has to have most everything, beyond cleaning the windshield, done by a certified Airframe and Powerplant mechanic, so maybe it’s this guy that you want to guide. If this is your target, then I suppose you have to anticipate everything that might be done wrong, or omitted, and then try to come up with field tests that can find that. Wow! Ed Price WB6WSN Chula Vista, CA USA From: Derek Walton [mailto:[email protected]] Sent: Monday, January 13, 2014 12:04 AM To: [email protected]; [email protected] Subject: Re: [PSES] Aircraft Electronics ATP HI Ed, thank you for keeping me honest :-) ATP was intended to mean Acceptance Test Procedure, and here I may have assumed too much. So, elaborating: What I was meaning is that the manufacturer of an avionics box derives a set of tests that are run in order to show the box is serviceable. Usually it is a complete set of tests, and, depending on technical justification and what has happened to the box, may be run in whole, or in part. It's not unusual to run a hi-pot test for example, but when thats done the EMI filters are "floated". For one of my employers, I forced a Network analyzer test until sufficient data was collected showing the bugs were worked out of manufacturing. I was unsuccessful in forcing that same test if the box was repaired: since repairs could be done almost anywhere in the globe, I often wondered if deficient hardware was out there as some assembly steps would negate the EMI protection but not show up in functional testing. I'm trying to gauge what "industry" does these days. As a frequent flier, I want a perfectly operational box on my airplane! Oh, and for those of my friends that don't fly, I want to make sure nothing falls on their heads :-) Sincerely, Derek. -----Original Message----- From: Ed Price <[email protected]> To: EMC-PSTC <[email protected]> Sent: Sun, Jan 12, 2014 11:52 pm Subject: Re: [PSES] Aircraft Electronics ATP Derek: Is “ATP” an Acceptance Test Procedure? If so, then acceptance by who, and to what specification? Is the device to be sold in the after-market, or to a prime who integrates it onto his platform? In very general terms, any test checks what the buyer and seller agree upon. At one extreme, a seller may do no testing, and a buyer tests the device at his own expense in order to confidently use it. At the other extreme, a seller may test the heck out of something, although the buyer couldn’t care less, so long as it’s cheap. Ed Price WB6WSN Chula Vista, CA USA From: Derek Walton [mailto:[email protected] <mailto:[email protected]?> ] Sent: Sunday, January 12, 2014 6:04 PM To: [email protected] Subject: [PSES] Aircraft Electronics ATP Good day folks, would anyone care to share on, or off list, what they are able to get performed as part of an ATP specifically checking EMC protection? Not intending to start an argument, just get some ideas if folks check filter pins, transient devices, isolation etc.... as part of an ATP Thanks in advance, Derek Walton L F Research - - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
