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KLN89B Question, Negligence or Premeditated?

  • Thread starter Thread starter FN FAL
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FN FAL

Freight Dawgs Rule
Joined
Dec 17, 2003
Posts
8,573
This is of course all hypothetical and in no way represents any events, persons or companies, operators or manufacturers, real or fictitious...or whatever.

What if you discovered that your IFR certified dashmount GPS had user defined waypoints stored in it that were named KXYZ, KCBS, KABC repersenting airports you normally fly to.

What if when you went to delete these KXYZ user waypoints, a flag came up on the screen that said you couldn't delete them because they were part of a Flight Plan in the "flight plan" data base.

What kind of thoughts would creep into your mind when you read the MEL write up sheet of the aircraft and the previous pilot states that the gps moving map displayed airports where there wasn't any, and that the the GPS was tracking to a point in space that was not an even airport...even though the flight plan he selected was an airport to airport flight plan? (so you get in the plane and select flight plan KABC to KXYZ, just like you do every friday as part of your job...but on this particular Friday, you track to a point that's not an airport even though it is named the desired KXYZ on the flight plan).

Then a flashback hits you of a flight from last summer, a flight that you somehow thought was fluke...where you selected a flight plan out of the "flight plan" data base like you do every day and every leg like clock work, but once you get within 20 miles of your selected assumed destination airport, you realize that a prominant land mark is now off of your right side to the west, instead of off your left side and to the east?

So now, as you are looking back, you realize that the last time there was this fluke flight where you selected a flight plan that you use all the time and it took you unkowingly to a user defined destination "identically" named the same as the airport you're supposed to be going to (like clock work)...and as you look at this new information and compare it to the fluke trip from last year and then it hits you like a crystaline bullet right in the forehead, that the course line of last summers "fluke" flight was taking you directly to the 1,300 AGL television antenna to the east of the airport you thought you selected...what would you be thinking?
 
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If I'm not mistaken, the KLN89B is a dual-input unit sampling both GPS and LORAN signals. Go into your setup mode and disable the LORAN feature. When the KLN89 came out I had that experience several times. I wasn't overly enamored with GPS at the time anyway, and that didn't help much. However, upon doing a little research, found that once I removed the outside inputs and left it only to sample GPS signal, trips to nonexistant waypoints and airports that weren't there, ended.
 
What I am doing, regardless of this "a-hem" hypothetical situation, is including in my preflight check of the KLN89B the normal start up stuff and checking to see if the altitude alert alarm has been turned down, off or had it's altitude alert tolerances changed...is that I will use the large knob to go to the "OTH" or "other" page, where I will then scoll the small knob to user defined waypoints. I will then observe what waypoints are in this page and If ever see waypoints listed as "K" followed by three letters, I am writing it down in the flight log.
 

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