Mailing List lml@lancaironline.net Message #25346
From: Kirk <kirk@direct2avionics.com>
Sender: Marvin Kaye <marv@lancaironline.net>
Subject: [LML] Chelton - Stormscope problem
Date: Mon, 06 Sep 2004 13:40:57 -0400
To: <lml@lancaironline.net>
Hal,
 
I have contacted the software team at Chelton and will let you know the outcome asap.  I will tell you that I haven't heard of any problems with the stormscope displaying properly due to software.  Any and all problems have been either installation related and on two occassions the WX-500 was defective.  Usually, it is mis-wired or the jumpers haven't been set properly on the WX-500.
 
Chelton has, in fact, passed the full level of L3 qualification testing with the the L3 Stormscope.  This testing was extensive and was performed at L3's engineering facility with Chelton's software team present last fall.  There is nothing wrong with the display of strike data on the Chelton system and it has been approved by L3.

I suspect the field service tech from L3 was having trouble running his test set.  The stormscope sends strikes with a heading parameter when installed properly and with the proper jumpers in place.  The heading parameter is the heading the strikes are relative to.  If the stormscope has valid heading info (from one of several sources, including the EFIS), then the strikes come in with a proper mag heading attached to them.  If the stormscope has no heading info, the aircraft will use its own heading to display the strikes.  This is correct operation.  I suspect he has overridden the stormscope's source of mag heading or not provided the proper input from his test set for mag heading.  It is unfortunate that William jumped to conclusions and condemed the improper operation of your Chelton instead of discussing his findings with his co-workers back at L3. 
 
In any case, I am double checking everything with Chelton to verify everything on our end.  Also, I spoke to a customer Sat. evening just before I left the fly-in that has the WX-500 hooked up with his Chelton and a MX-20.  He has over 200 hours on the system and verified that when he receives strike information, it displays (correctly) on both displays in identical quadrants.
 
Kirk Hammersmith
President
Direct-To Avionics, LLC
541.504.8300 v
775.416.3222 f
www.direct2avionics.com
 

 
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