2 Responses to “Link to B-777 upset?”

1. admin says:

   July 30 at 5:50 pm

   Capt.Doug wrote:
   > In the recent Airbus nose gear thread, someone posted a link to a report
   > about a B-777 fly-by-wire upset. I can’t find it now and am asking if
   > someone can bring up the link to this report.

   No link, but there’s a good description of what happened n page 46 of
   the 26 Sept edition of AvWeek.  Basically the problem was in the
   firmware loaded into the Honeywell air data reference unit that feeds
   air data and altitude information to a bunch of systems, including the
   primary flight controls, autopilot, autothrottle, pilot displays and
   autobrakes.

   The FAA issued AD 2005-18-51 which requires that any Adiru loaded with
   -06 or -07 software be reloaded with -03 within 72 hours.  The -03
   version has its own problems that they’ve been trying to fix revolving
   around the ability to use data from failed sensors.

   There’s a fairly extensive blow-by-blow in the article, which also notes
   that things would have been a lot worse had the primary flight computer
   not used the data from the standby air data source to dampen the initial
   pitching motion and would have gone utterly to pieces if there hadn’t
   been someone looking out the window and deciding that what the
   instrumentation was saying (like the slip indicator swinging to full
   right) made absolutely no sense.

   Making one feel really warm-and-fuzzy, page 52 of the same edition
   carries a report that Airbus is considering new functionality from
   Honeywell that will allow software to take control of the aircraft from
   the pilots in the event of a EGPWS alarm, and in later evolution,
   prevent the aircraft from flying into prohibited areas.  In the case of
   the triple-seven the pilots were able to beat the flight control system
   into submission, but here we have the provider of the same quality
   software proposing to make it impossible for the flight crew to do so.
2. admin says:

   July 30 at 5:50 pm

   "Capt.Doug" <Capt.D…@theatt.net> wrote in message

   news:Uic0f.362820$5N3.182205@bgtnsc05-news.ops.worldnet.att.net…

   > In the recent Airbus nose gear thread, someone posted a link to a report
   > about a B-777 fly-by-wire upset. I can’t find it now and am asking if
   > someone can bring up the link to this report.

   > TIA,
   > D.

   Try this one:
   http://www.atsb.gov.au/aviation/occurs/occurs_detail.cfm?ID=767

   The link says 767 but the report says 777.