>That would be simple: two momentary switches to be actuated at the same time with enough physical distance between >them....
That is exactly what will be enforced by this method: 2 crew members at all time in the cockpit. If there is only one crew member , no lock-out is possible, unless he/she has abnormal long arms .... You need 2 now to lockout a third. Simple cheap and fail safe against just this specific problem. Gert -----Original Message----- From: John Allen [mailto:john_e_al...@blueyonder.co.uk] Sent: Thursday 2 April 2015 09:12 To: ce-test, qualified testing bv - Gert Gremmen Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] SV: [PSES] Germanwings crash Gert That's fine when there are two people in the cockpit - but what happens when one has left to answer the call of nature? Presumably the door cannot then be closed or opened - so it has to stay open, which breaks the major post 9/11 rule that the door has to be kept closed and locked at all times except when a crew person is legitimately leaving / entering. -----Original Message----- From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl] Sent: 02 April 2015 05:15 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] SV: [PSES] Germanwings crash >Or lockout should be impossible unless there are two officers on the flight deck (two security codes needed, not a toggle switch!). That would be simple: to momentary switches to be actuated at the same time with enough physical distance between them.... Gert Gremmen - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
