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MauleDriver(at)nc.rr.com Guest
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Posted: Fri Feb 26, 2010 7:53 am Post subject: OT & Cross Post - reflections on the transition from analog |
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Way off topic: Here's a video of an almost-accident by NZ60 landing at
Apia (Samoa?). It depicts how the failure of an ILS component at the
airport went undetected by multiple RF-based analog pieces of Nav
equipment including the ILS receivers, the FMS (digital?), and the
autopilot systems Only after the 3 pilots broke out and couldn't make
sense of the lights did their doubts finally result in a go-around
followed by a safe landing. Fascinating and informative for any
instrument pilot:
http://www.youtube.com/watch?v=GelRBhJ4gmI&feature=PlayList&p=C325C5DA287EC296&index=7
It's 3 parts long - if you enjoy it, you'll find part 2 and 3.
Anyway, this had me reflecting on how much more capable and reliable
digital based navigation (GPS) might be compared to analog based
systems. In the above example, everything in the aircraft worked as
designed. Procedures were for the most part, followed and executed.
The automated navigation systems of the aircraft were prepared to fly it
into the ground. The collective brain of the 3 pilots (NZ designation)
was the only thing that saved a crash. Is a WAAS based overlay of the
approach susceptible to a similiar sort of failure?
Arguably, one can now see the point in time where fully automated
flights, without pilots, can be accomplished. And of course these
flights are being made by mililtary drones and the Mars explorers.
No new news here, just marveling at it all.
I posted the response below to Sonex293 on the Aeroelectric list - check
the mikrokopter link at the bottom if you haven't seen it before.
That's what got me day dreaming in the first place....
--------
The next gen of OBAM aircraft? It reminds me that we are probably in
the golden age of OBAMA and personal GA (no pun intended).
Just reverse this scenario
http://alturl.com/gmqu
As unmanned and unpiloted aircraft hit their stride, those unpredictable
piloted aircraft with their free thinking, and at times, malevolent
pilots are going to be increasingly pushed into airspace restricted to
non-commercial, non-military, no-ATC-services areas. Probably to be
called 'uncontrolled' airspace... and we know how rare that has become.
Makes one savor the ability to hand fly our hand built aircraft from
coast to coast, all within the system.
Neat link. Thanks.
sonex293 wrote:
Kits are available...
http://www.mikrokopter.de/
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cjay
Joined: 15 Dec 2007 Posts: 53
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Posted: Sun Feb 28, 2010 7:13 pm Post subject: Re: OT & Cross Post - reflections on the transition from |
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I don't see where you draw the conclusion that gps is more capable and reliable. It is true the scenario revealed a flaw in the receive equipment when the ILS transmitter system had malfunctioned, and it is true that digital systems can achieve better error control, but two points - first ILS systems are extremely reliable and very few accidents can be accredited to ILS error when the equipment is maintained and operating correctly. Second, gps can malfunction too, one example is gps signals are very susceptible to interference signals. This happens much more than the kind of example shown in the ILS incident.
cjay
MauleDriver(at)nc.rr.com wrote: |
Anyway, this had me reflecting on how much more capable and reliable
digital based navigation (GPS) might be compared to analog based
systems. In the above example, everything in the aircraft worked as
designed. Procedures were for the most part, followed and executed.
The automated navigation systems of the aircraft were prepared to fly it
into the ground. The collective brain of the 3 pilots (NZ designation)
was the only thing that saved a crash. Is a WAAS based overlay of the
approach susceptible to a similiar sort of failure?
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Strasnuts
Joined: 10 Feb 2009 Posts: 502 Location: Salt Lake City, UT
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Posted: Sun Feb 28, 2010 7:17 pm Post subject: OT & Cross Post - reflections on the transition from analog |
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At least GPS has RAIM and will let you know when it is not reccieving good
info.
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