No, not really Doc. A rad alt gives very accurate distance to an
indicator in the cockpit. It can indeed be used to tie in to a gear
warning system of course as you mentioned, but it is very expensive. A
ground proximity warning system on the other hand, is much cheaper
(usually) and simply senses that the aircraft is within a certain preset
distance from the ground. Extreme accuracy is not usually necessary.
As long as it triggers somewhere between say 50 to 100 feet from the
deck. It would tie in to the gear warning light system with an AND gate
for summing the gear warning lights. It could also be wired with a tad
bit more circuitry to a solenoid that would replace the landing gear
safety pin. This pin would activate any time the gear was already down
and the aircraft was below the GPWS setting with a delay factor. This
would also mean that you could not RAISE the gear until you were over
150 feet or so from the runway.... which is another good safety factor.
If the gear was UP the solenoid pin would be disabled. This way you can
do away with a Weight On Wheels or... Weight OFF Wheels switch, which as
Tom mentioned is pretty much impossible to do on a 50, or possibly even
a 52. But it solves that problem does it not Tom?
Mark
________________________________
From: owner-yak-list-server@matronics.com on behalf of Roger Kemp MD
Sent: Wed 10/8/2008 11:21 PM
To: yak-list@matronics.com
Subject: RE: Re: RED ALERT - Safety Review
<viperdoc@mindspring.com>
You referring to a WOW switch coupled to a radar altimeter?
Doc
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G
CIV Det Cherry Point, MALS-14 64E
Sent: Wednesday, October 08, 2008 8:55 PM
To: yak-list@matronics.com
Subject: RE: Re: RED ALERT - Safety Review
What is needed is a cheap and simple ground proximity warning system.
I
believe the time for that is coming. We're seeing more and more systems
incorporated in cars that sense proximity. When these are small,
reliable
and cheap, putting them into an aircraft will be a no-brainer.
Mark Bitterlich
________________________________
From: owner-yak-list-server@matronics.com on behalf of Tim Gagnon
Sent: Wed 10/8/2008 9:38 PM
To: yak-list@matronics.com
Subject: Re: RED ALERT - Safety Review
tjyak50 wrote:
> We've gone around and around on this subject for years.
> There is always a way to find a reason why each system isn't perfect.
>
> So nobody does anything.
Build it and they will come.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 7999#207999
