Another potential date problem for some GPS units

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From: Dan Schaefer <dfschaefer [at] usa.net>
Subject: Another potential date problem for some GPS units
Date: Tue, 29 Sep 1998 19:17:32
To: <lancair.list [at] olsusa.com>

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While looking around the Allied Signal Web site for any data on the

Y2K and Date roll-over problems, I came across Service Memo #359,

apparently published this month, with the Subject line referring to

"Leap Year Date Anomaly - Jan 32". The jist of the SM says that on

February 1 of any leap year, including year 2000, the units will

display a "System Error" and WILL BE INOPERATIVE FOR THAT DAY. (Their

emphasis). The SM explains that it's a software glitch causing an

incorrect leap year calculation resulting in computing that date as

January 32. The SM also states that the anomaly will correct itself

the next day and operate normally on Feb 2.

The units affected are their KLX 135 and KLX 135A with specific

Software mod levels installed. The SM also states that the same

receivers with later S/W mod levels are not affected and that the two

receivers can be upgraded to the later mod level. To be sure to

get the straight poop on the various S/W versions, if you have one of

these GPS's in your panel, as I do, you should check out the SM at:



"http://www.alliedsignal.com"



and then follow the buttons to the Service Memo.



There was one thing that the SM seemed a bit confused on and that was

identifying the KLX 135 as a GPS/Comm. I'm sure that one is GPS only

while the KLX 135A includes the Comm Tranceiver. Doesn't matter much

to the GPS section but I intend to ask about it anyway, and will post

what I hear.



Cheers,



Dan Schaefer









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