Could be the headsets are considered risks as far as interference goes, but the request to turn them off may simply be a means of making sure the passengers are able to hear and respond to any directions from the crew during takeoffs and landings. Bob R.
Ken Javor <[email protected]> wrote: I have worked on these headsets and can confirm they are or at least can be clocked systems with very sophisticated algorithms. They will definitely have to meet some type of commercial radiated emission requirement. But whereas the pilots' headsets will have been qualified to RTCA/DO-160 section 21 radiated emission control, headsets commercially available to passengers will not have been, and thus they must be handled precisely as other personal electronics. From: Brian Epstein <[email protected]> List-Post: [email protected] Date: Wed, 14 Feb 2007 18:46:45 -0800 To: Robert Johnson <[email protected]>, [email protected] Subject: Re: Noise canceling headsets The way these headsets adapt to ambient noise in realtime suggests DSP whose clock harmonics could interfere with navigation hardware. Regards, Brian Epstein ENT Consulting [email protected] (805) 591-9587 At 06:02 PM 2/14/2007, Robert Johnson wrote: On my last flight the flight attendant requested all electronic devices be turned off and specifically mentioned noise canceling headsets. The only real use I have for noise canceling headsets is for aircraft noise. I assumed these headsets were purely audio circuits. Is there some reason for them to be producing RF emissions? Is this just an uneducated paranoia about all things electronic? Is this just an attendant's opinion, an airline or FAA policy? The pilots use them, why not the passengers? Bob Johnson ITE Safety <http://www.itesafety.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
