Technology Gotchas

First we got an e-mail from a reader concerned that Garmin was removing airports with runways under 4000 feet from their worldwide database. Next, a reader related a situation where hed been cleared direct to a fix that wasnt in his Garmin GNS 430, but it showed up when he loaded an RNAV arrival. These produced some internal discussions and one of our staff related a story from a friend of his whod busted a stepdown fix altitude because the stepdown fix wasnt depicted on the approach in his Bendix-King KLN-94.

Key Takeaways:

• Older aviation navigators (e.g., Garmin GNS 430, Bendix-King KLN-94) are facing increasing limitations due to their outdated hardware's inability to cope with the exponentially growing volume of aviation data.
• Specific issues include Garmin's worldwide database dropping airports with short runways, and non-WAAS Garmin GNS units not recognizing certain "direct-to" waypoints due to internal data storage limits.
• Bendix-King KLN-series navigators may not display step-down fixes on approaches or support multiple approach types (e.g., X, Y, Z variants) to the same runway, stemming from early design constraints.
• Pilots using these legacy systems must be vigilant about these escalating technological limitations and rely on traditional charts and procedures, as the environment has evolved beyond the navigators' original design capabilities.

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