********* In response to: http://www.politechbot.com/p-02004.html ********* From: Bockhorst Roland Civ AMC/SAS <Roland.Bockhorstat_private> To: "'declanat_private'" <declanat_private> Subject: RE: Software problems apparently caused Osprey aircraft crash Date: Mon, 14 May 2001 20:08:27 -0500 Declan; With a little background in flight controls software I offer my humble opinion. The software should have: Detected airborne state upon receipt of reset signal and, at best, performed an abbreviated self test and not commanded the nacelle excursion. The pilot incorrectly believed in the reset button. Receipt of a reset command on the ground could result in self test that could take seconds to perform. Required control system gain changes necessitated by a mechanical gain change due to hydraulic malfunctions were not in the software correctly. The software worked as designed and that was inadequate to the flight conditions under this particular failure mode. 'course this speculation of the highest order comes from a few years of paying attention. Now that they know where there is weakness in the flight envelope, they know where to do more software testing. Keep up the good work. Your efforts are mightily appreciated. (Standard disclaimers) Roland Roland Bockhorst AMC CSS SASP Rapid Application Development Scott AFB, IL (618) 256-2300 ------------------------------------------------------------------------- POLITECH -- Declan McCullagh's politics and technology mailing list You may redistribute this message freely if it remains intact. To subscribe, visit http://www.politechbot.com/info/subscribe.html This message is archived at http://www.politechbot.com/ -------------------------------------------------------------------------
This archive was generated by hypermail 2b30 : Tue May 15 2001 - 08:31:05 PDT